![80 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS
If I click the Continue button, everything continues, and at the end, I’m offered the
chance to reboot into the new installation. However, when I reboot, the Ubuntu desktop
doesn’t appear. Instead, all I see is a black screen with a text-mode login prompt.
Solution
For some reason, vital Ubuntu software hasn’t been correctly copied to the machine. At
the login prompt, type your username, and type your password when it’s requested. Then, at
the command prompt, type the following:
sudo apt-get update
[At this point you'll need to type your password; do so]
sudo apt-get –f install
sudo apt-get install ubuntu-desktop
You should ensure the DVD-ROM is inserted. If you find this doesn’t work, follow the
instructions in the “None of These Solutions Work!” sidebar, and install Ubuntu using the
alternate installer.
Problem
When the Ubuntu installation program gets to the Starting Up the Partitioner stage, it
reports that it can’t find any hard disk in my computer.
Solution
There are many possible reasons for this, but here are three potential solutions that you
might try in sequence:
1. Select Manual and click the Forward button. You should see a list of hard disks with
each of its partitions displayed, and you should then be able to follow the instruc-
tions under the “Manually Edit the Partition Table” heading in Chapter 5.
2. Ensure the jumpers are set correctly on the hard disk (consult the hard disk’s doc-
umentation if necessary). This is particularly worth checking if you have more than
one hard disk. If this doesn’t solve the problem, and your second hard disk is non-
bootable (that is, it’s used only for data storage), try temporarily removing it, and
then install Ubuntu. Reconnect it after installation has completed.
3. See the “None of These Solutions Work!” sidebar to learn how to use the alternate
installer. This contains an older installation program that many consider more
reliable on some problematic computers.](https://image.slidesharecdn.com/beginningubuntulinux3rded-tqwdarksiderg-100320105558-phpapp02/85/Beginning-Ubuntu-Linux-3rd-Ed-Tqw-Darksiderg-116-320.jpg)
![360 CHAPTER 15 ■ WORKING WITH TEXT FILES
useful if you’re looking for a word that might be spelled differently from how you antici-
pate, for example.
The most basic form of regex is the bracket expansion. This is where additional search
terms are enclosed in square brackets within a search string. For example, suppose you
want to find a file that refers to several drafts of a document you’ve been working on. The
files are called myfile_1draft.doc, myfile_2draft.doc, and so on. To find any document
that mentions these files, you could type this:
grep 'myfile_[1-9]draft.doc' *
The use of square brackets tells grep to fill in details within the search string based on
what’s inside the square brackets. In this case, 1-9 means that all the numbers from one
to nine should be applied to the search string. It’s as if you’ve told grep to search for
myfile_1draft.doc, and then told it to search for myfile_2draft.doc, and so on. Notice
that the example has a backslash before the period separating the file extension from the
filename. This indicates to grep that it should interpret the period as an element of the
string to be searched for, rather than as a wildcard character, which is how grep usually
interprets periods.
You don’t need to specify a range of characters in this way. You can simply enter what-
ever selection of characters you want to substitute into the search string. Here’s an example:
grep 'myfile[12345].doc' *
This will attempt to find any mention of myfile1.doc, myfile2.doc, myfile3.doc, and so
on, in any file within the directory.
Here’s another example:
grep '[GgNn]ome' *
This will let you search for the word Gnome within files but takes into account any possible
misspelling of the word by people who forget to use the silent G, and any use of uppercase
or lowercase.
This is only scratching the surface of what regexes can do. For example, many regexes
can be combined together into one long search string, which can provide astonishing
accuracy when searching. Table 15-3 contains some simple examples that should give you
an idea of the power and flexibility of regexes.
Table 15-3. Some Examples of Regular Expressions
Search String Description
'document[a-z]' Returns any lines containing the string “document” followed by
any single letter from the range a through z.
'document[A-Za-z]' Returns any lines containing the string “document” followed by
the letters A through Z or a through z. Note that no comma or
other character is needed to separate possibilities within square
brackets.](https://image.slidesharecdn.com/beginningubuntulinux3rded-tqwdarksiderg-100320105558-phpapp02/85/Beginning-Ubuntu-Linux-3rd-Ed-Tqw-Darksiderg-396-320.jpg)
![C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 361
Table 15-3. Some Examples of Regular Expressions
Search String Description
'document.' Returns any lines containing the string “document” followed
by any other character. The period is used as a wildcard signify-
ing any single character.
'document[[:digit:]]' Returns any lines containing the string “document” followed by
any number.
'document[[:alpha:]]' Returns any lines containing the string “document” followed by
any character.
'^document' Returns any lines that have the string “document” at the
beginning. The caret symbol (^) tells grep to look only at the
beginning of each line.
'document$' Returns any line that has the string “document” at the end of
the line. The dollar sign symbol ($) tells grep to look for the
string only at the end of lines.
'document[^1-6]' Returns lines that have the string “document” in them but not if
it’s followed by the numbers 1 through 6. When used in square
brackets, the caret character (^) produces a nonmatching list—
a list of results that don’t contain the string.
grep is very powerful. It can be complicated to master, but it offers a lot of scope for
performing extremely precise searches that ensure you find only what you’re seeking. It’s
well worth reading through its man pages. You can also refer to books on the subject, of
which there are many. A good example is Regular Expression Recipes: A Problem-Solution
Approach, by Nathan A. Good (1-59059-441-X; Apress, 2004).
Comparing Text Files
If you want to compare the differences between two text files, one way to do this is to use
the diff command. This is designed primarily to uncover small changes in otherwise
identical documents, such as revisions made by another person. Of course, it can also be
used to prove that two files are identical. If you run the files through diff, and it shows no
output, it has been unable to spot any differences.
diff is ordinarily used like this:
diff mytextfile1 mytextfile2
If diff spots any differences between the files, the results are a little more complicated
than you might be used to. Any lines that are different within the files will appear on screen.
Those lines that are identical won’t be displayed. Lines preceded with a left angle bracket
(<) are from the first file, while those with a right angle bracket (>) are from the second file.
For a different display, you could type something like this:](https://image.slidesharecdn.com/beginningubuntulinux3rded-tqwdarksiderg-100320105558-phpapp02/85/Beginning-Ubuntu-Linux-3rd-Ed-Tqw-Darksiderg-397-320.jpg)
![CHAPTER 16 ■ TAKING CONTROL OF THE SYS TEM 373
Controlling Jobs
Whenever you start a program at the shell, it’s assigned a job number. Jobs are quite sepa-
rate from processes and are designed primarily for users to understand what programs
are running on the system.
You can see which jobs are running at any one time by typing the following at the
shell prompt:
jobs
When you run a program, it usually takes over the shell in some way and stops you from
doing anything until it’s finished what it’s doing. However, it doesn’t have to be this way.
Adding an ampersand symbol (&) after the command will cause it to run in the background.
This is not much use for commands that require user input, such as vim or top, but it can
be very handy for commands that churn away until they’re completed.
For example, suppose that you want to decompress a large zip file. For this, you can use
the unzip command. As with Windows, decompressing large zip files can take a lot of
time, during which time the shell would effectively be unusable. However, you can type the
following to retain use of the shell:
unzip myfile.zip &
When you do this, you’ll see something similar to the following, although the four-digit
number will be different:
[1] 7483
This tells you that unzip is running in the background and has been given job number 1.
It also has been given process number 7483 (although bear in mind that when some
programs start, they instantly kick off other processes and terminate the one they’re
currently running, so this won’t necessarily be accurate).
■Tip If you’ve ever tried to run a GUI program from the shell, you might have realized that the shell is inaccessible
while it’s running. Once you quit the GUI program, the control of the shell will be returned to you. By specifying
that the program should run in the background with the & (ampersand symbol), you can run the GUI program
and still be able to type away and run other commands.](https://image.slidesharecdn.com/beginningubuntulinux3rded-tqwdarksiderg-100320105558-phpapp02/85/Beginning-Ubuntu-Linux-3rd-Ed-Tqw-Darksiderg-409-320.jpg)
![374 CHAPTER 16 ■ TAK ING CONTROL OF THE SYS TE M
You can send several jobs to the background, and each one will be given a different job
number. In this case, when you wish to switch to a running job, you can type its number.
For example, the following command will switch you to the background job assigned the
number 3:
%3
You can exit a job that is currently running by pressing Ctrl+Z. It will still be there in the
background, but it won’t be running (officially, it’s said to be sleeping). To restart it, you
can switch back to it, as just described. Alternatively, you can restart it but still keep it in
the background. For example, to restart job 2 in the background, leaving the shell prompt
free for you to enter other commands, type the following:
%2 &
You can bring the command in the background into the foreground by typing the
following:
fg
When a background job has finished, something like the following will appear at the shell:
[1]+ Done unzip myfile.zip
Using jobs within the shell can be a good way of managing your workload. For example,
you can move programs into the background temporarily while you get on with something
else. If you’re editing a file in vim, you can press Ctrl+Z to stop the program. It will remain
in the background, and you’ll be returned to the shell, where you can type other commands.
You can then resume vim later on by typing fg or typing % followed by its job number.
■Tip Also useful is Ctrl+C, which will kill a job that’s currently running. For example, if you previously
started the unzip command in the foreground, hitting Ctrl+C will immediately terminate it. Ctrl+C is useful
if you accidentally start commands that take an unexpectedly long time to complete.](https://image.slidesharecdn.com/beginningubuntulinux3rded-tqwdarksiderg-100320105558-phpapp02/85/Beginning-Ubuntu-Linux-3rd-Ed-Tqw-Darksiderg-410-320.jpg)
![CHAPTER 26 ■ IN DEPTH: B ASE 515
Figure 26-2. The Table Wizard contains ready-made data fields for a wide variety of uses.
6. For this example, you want to add a check box that shows whether the CD is scratched.
If the CD in question is scratched, the user can click in a check box. If the CD isn’t
scratched, the box can be left blank. To create a check box, you need a special kind
of data field called a Boolean. This means that the data field can be either true or
false or, to put it a simpler way, it can hold either yes or no. To create a yes/no data
field, click the plus button at the bottom of the Selected Fields box. This allows you
to add another field. In the Field Name box, type Scratched. For the Field Type, click
the drop-down list and locate the entry marked Yes/No [BOOLEAN]. The other
options can remain as they are. Click Next to continue.
7. You’re asked if you want to create a primary key. This is the unique numeric field
that the database uses to keep track of each entry in the database. It’s a must in a
database like this one. The default choices are correct, so you can click Next again.
8. You’ve completed the Table Wizard. The next step is to create a form, so select
Create a Form Based on This Table, and then click the Finish button.](https://image.slidesharecdn.com/beginningubuntulinux3rded-tqwdarksiderg-100320105558-phpapp02/85/Beginning-Ubuntu-Linux-3rd-Ed-Tqw-Darksiderg-551-320.jpg)
![672 APPENDIX C ■ GETTING FURTHER HELP
Man Pages
Man pages are the oldest form of Unix documentation. In the old days, once an individual
had created a piece of software, he would write a brief but concise man page in order to
give others a clue as to how to operate it. The programmer would come up with a few
screens of documentation that could be called up from the command prompt. This docu-
mentation would outline what the software did and list all the ways in which it could be used.
Nowadays, depending on the software package, man pages are usually created by tech-
nical writers, but the concept of providing essential information still applies. Man pages
under Linux provide all the information you need about how to use a particular command
or piece of software.
Sounds great, doesn’t it? Alas, there’s a problem: man pages are written by software
engineers for software engineers. They expect you to already understand the technology
being discussed. This is illustrated very well by the man page for cdrecord, software that
can be used to burn CD images to disc. You can view this man page by typing man cdrecord at
the command prompt.
The first line of the man page states, “Cdrecord is used to record data or audio Compact
Discs on an Orange Book CD-Recorder or to write DVD media on a DVD-Recorder.”
Most of that is clear, but what do they mean by “Orange Book”? They don’t explain.
(If you’re curious, head over to http://searchstorage.techtarget.com/sDefinition/
0,,sid5_gci503648,00.html.)
Further down in the man page, you see, “Cdrecord is completely based on SCSI commands
. . . Even ATAPI drives are just SCSI drives that inherently use the ATA packet interface as
[a] SCSI command transport layer.”
What’s SCSI, or ATAPI for that matter? Again, the man page doesn’t explain. (They’re
methods of interfacing with storage devices attached to your computer.)
But why should man pages explain as they go along? Their function is to describe how
to use a piece of software, not to provide a beginner’s introduction to technology. If they
did that, a single man page could run to hundreds of pages.
In other words, man pages are not for complete beginners. This isn’t always the case
and, because Linux sees widespread usage nowadays, man pages are sometimes created
with less knowledgeable users in mind. But even so, the format is inherently limited: man
pages provide concise guides to using software. Luckily, there are some tips you can bear
in mind to get the most from a man page. But before you can use those tips, you need to
know how to read a man page.
How to Read a Man Page
To read a man page, you simply precede the command name with man. For example, to
read the man page of cdrecord, a piece of software used to write ISO images to CD-R/RW
discs, type the following command:
man cdrecord](https://image.slidesharecdn.com/beginningubuntulinux3rded-tqwdarksiderg-100320105558-phpapp02/85/Beginning-Ubuntu-Linux-3rd-Ed-Tqw-Darksiderg-708-320.jpg)
![A PPEN DI X C ■ GET T ING FURT H ER H ELP 673
This opens a simple text viewer with the man page displayed. You can move up and
down line by line with the cursor keys, or move page by page using the Page Up and Page
Down keys (these are sometimes labeled Pg Up and Pg Down). You can search by hitting
the forward slash key (/). This will highlight all instances of the word you type. You can
search for other examples of the word in the document by hitting the n key.
The average man page will include many headings, but the following are the most
common:
Name: This is the name of the command. There will also be a one-sentence summary
of the command.
Synopsis: This lists the command along with its various command options (some-
times known as arguments or flags). Effectively, it shows how the command can be
used. It looks complicated, but the rules are simple. First is the command itself. This
is in bold, which indicates it is mandatory. This rule applies to anything else in bold:
it must be included when the command is used. Anything contained within square
brackets ([]) is optional, and this is usually where you will find the command options
listed. A pipe symbol (|) separates any command options that are exclusive, which means
that only one of them can be used. For example, if you see [apple|orange|pear], only one
of apple, orange, or pear can be specified. Usually at the end of the Synopsis listing will
be the main argument, typically the file(s) that the command is to work on and/or
generate.
Description: This is a concise overview of the command’s purpose.
Options: This explains what the various command options do, as first listed in the
Synopsis section. Bearing in mind that command options tell the software how to
work, this is often the most useful part of the man page.
Files: This lists any additional files that the command might require or use, such as
configuration files.
Notes: If this section is present (and often it isn’t), it sometimes attempts to further
illuminate aspects of the command or the technology the command is designed to
control. Unfortunately, Notes sections can be just as arcane as the rest of the man page.
See Also: This refers to the man pages of other commands that are linked to the
command in question. If a number appears in brackets, this means the reference is to
a specific section within the man page. To access this section, type: man <section no>
command.
Although there are guidelines for the headings that should appear in man pages, as well
as their formatting, the fact is that you may encounter other headings, or you may find
nearly all of them omitted. Some man pages are the result of hours if not days of effort;
others are written in ten minutes. Their quality can vary tremendously.](https://image.slidesharecdn.com/beginningubuntulinux3rded-tqwdarksiderg-100320105558-phpapp02/85/Beginning-Ubuntu-Linux-3rd-Ed-Tqw-Darksiderg-709-320.jpg)
Beginning Ubuntu Linux 3rd Ed ~Tqw~ Darksiderg
- 1. The eXperT’s Voice ® in open source Fully revised and updated for Ubuntu 8.04 (Hardy Heron LTS) Beginning and above! Ubuntu Linux The complete guide to Ubuntu—includes everything you need to take advantage of the world’s favorite Linux operating system. Third EdiTion Keir Thomas and Jaime Sicam Accompanying dVd includes full versions of Ubuntu 8.04 LTS, as well as Kubuntu, Edubuntu, Xubuntu, and PPC releases!
- 3. Beginning Ubuntu Linux Third Edition ■■■ Keir Thomas and Jaime Sicam
- 4. Beginning Ubuntu Linux, Third Edition Copyright © 2008 by Keir Thomas, Jaime Sicam All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval system, without the prior written permission of the copyright owner and the publisher. ISBN-13 (pbk): 978-1-59059-991-4 ISBN-10 (pbk): 1-59059-991-8 ISBN-13 (electronic): 978-1-4302-0650-7 Printed and bound in the United States of America 9 8 7 6 5 4 3 2 1 Trademarked names may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, we use the names only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. Java™ and all Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc., in the US and other countries. Apress, Inc., is not affiliated with Sun Microsystems, Inc., and this book was written without endorsement from Sun Microsystems, Inc. Lead Editor: Frank Pohlmann Technical Reviewers: Daniel James, Keir Thomas, Eric Hewitt Editorial Board: Clay Andres, Steve Anglin, Ewan Buckingham, Tony Campbell, Gary Cornell, Jonathan Gennick, Matthew Moodie, Joseph Ottinger, Jeffrey Pepper, Frank Pohlmann, Ben Renow-Clarke, Dominic Shakeshaft, Matt Wade, Tom Welsh Project Manager: Beth Christmas Copy Editor: Marilyn Smith Associate Production Director: Kari Brooks-Copony Production Editor: Laura Esterman Compositor: Susan Glinert Stevens Proofreader: Linda Seifert Indexer: Broccoli Information Management Artist: April Milne Cover Designer: Kurt Krames Manufacturing Director: Tom Debolski Distributed to the book trade worldwide by Springer-Verlag New York, Inc., 233 Spring Street, 6th Floor, New York, NY 10013. Phone 1-800-SPRINGER, fax 201-348-4505, e-mail orders-ny@springer-sbm.com, or visit http://www.springeronline.com. For information on translations, please contact Apress directly at 2855 Telegraph Avenue, Suite 600, Berkeley, CA 94705. Phone 510-549-5930, fax 510-549-5939, e-mail info@apress.com, or visit http:// www.apress.com. Apress and friends of ED books may be purchased in bulk for academic, corporate, or promotional use. eBook versions and licenses are also available for most titles. For more information, reference our Special Bulk Sales–eBook Licensing web page at http://www.apress.com/info/bulksales. The information in this book is distributed on an “as is” basis, without warranty. Although every precaution has been taken in the preparation of this work, neither the author(s) nor Apress shall have any liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or indirectly by the information contained in this work. The source code for this book is available to readers at http://www.apress.com.
- 5. Dedicated to you, now that you have a choice —Jaime Sicam
- 6. Contents at a Glance About the Authors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiii About the Technical Reviewers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxv Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxvii Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxix Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxi PART 1 ■■■ Introducing the World of Linux ■CHAPTER 1 Welcome! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ■CHAPTER 2 A History and Politics Lesson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 ■CHAPTER 3 The Realities of Running Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 PART 2 ■■■ Installing Ubuntu ■CHAPTER 4 Preinstallation Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ■CHAPTER 5 Installing Ubuntu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3 ■CHAPTER 6 Solving Installation Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 PART 3 ■■■ The No-Nonsense Getting Started Guide ■CHAPTER 7 Booting Ubuntu for the First Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 ■CHAPTER 8 Getting Everything Up and Running . . . . . . . . . . . . . . . . . . . . . . . . . . 117 ■CHAPTER 9 How to Secure Your Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 ■CHAPTER 10 Personalizing Ubuntu: Getting Everything Just Right . . . . . . . . . . 213 ■CHAPTER 11 Ubuntu Replacements for Windows Programs . . . . . . . . . . . . . . . . 257 ■CHAPTER 12 Managing Your Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 iv
- 7. PART 4 ■■■ The Shell and Beyond ■CHAPTER 13 Introducing the BASH Shell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303 ■CHAPTER 14 Understanding Linux Files and Users . . . . . . . . . . . . . . . . . . . . . . . . 321 ■CHAPTER 15 Working with Text Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347 ■CHAPTER 16 Taking Control of the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365 ■CHAPTER 17 Cool Shell Tricks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 PART 5 ■■■ Multimedia ■CHAPTER 18 Digital Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391 ■CHAPTER 19 Movies and Multimedia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413 ■CHAPTER 20 Digital Photos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429 PART 6 ■■■ Office Tasks ■CHAPTER 21 Making the Move to OpenOffice.org . . . . . . . . . . . . . . . . . . . . . . . . . 453 ■CHAPTER 22 OpenOffice.org Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463 ■CHAPTER 23 In Depth: Writer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479 ■CHAPTER 24 In Depth: Calc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491 ■CHAPTER 25 In Depth: Impress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501 ■CHAPTER 26 In Depth: Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511 ■CHAPTER 27 In Depth: Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521 v
- 8. PART 7 ■■■ Keeping Your System Running ■CHAPTER 28 Installing and Removing Software . . . . . . . . . . . . . . . . . . . . . . . . . . . 545 ■CHAPTER 29 Managing Users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 575 ■CHAPTER 30 Optimizing Your System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585 ■CHAPTER 31 Backing Up Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599 ■CHAPTER 32 Scheduling Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613 ■CHAPTER 33 Accessing Computers Remotely . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 619 PART 8 ■■■ Appendixes ■APPENDIX A Glossary of Linux Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635 ■APPENDIX B BASH Command Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 657 ■APPENDIX C Getting Further Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 671 ■APPENDIX D Exploring the DVD-ROM and Other Ubuntu Versions . . . . . . . . . . . 681 ■INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695
- 9. Contents About the Authors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiii About the Technical Reviewers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxv Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxvii Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxix Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxi PART 1 ■■■ Introducing the World of Linux ■CHAPTER 1 Welcome! ..................................................3 What Is Linux? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 The Age of Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 The Problems with Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 The Benefits of Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Fewer Crashes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Free and Shareable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 No Annoying Copy Protection or Usage Restrictions . . . . . . . . . . . . . . 9 The Linux Community . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 ■CHAPTER 2 A History and Politics Lesson . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 In the Beginning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 The GNU Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Proprietary Software and the GPL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 GNU and Linux Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Different Flavors of Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Linux Today . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Modern Linux Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 vii
- 10. viii ■C O N T E N T S ■CHAPTER 3 The Realities of Running Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Learning to Use Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Who Uses Linux? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Getting Hold of Linux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Using Ubuntu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 PART 2 ■■■ Installing Ubuntu ■CHAPTER 4 Preinstallation Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Understanding Partitioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Freeing Up Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Reclaiming Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Removing Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Using Another Hard Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Backing Up Your Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Backing Up E-Mail Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Making Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 ■CHAPTER 5 Installing Ubuntu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 An Overview of the Installation Process . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Step-by-Step Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Stage 1: Prepare the Windows Partition for Resizing . . . . . . . . . . . . 46 Stage 2: Boot from the DVD-ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Stage 3: Choose Language Settings . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Stage 4: Select from the Boot Menu. . . . . . . . . . . . . . . . . . . . . . . . . . 50 Stage 5: Choose a Language for Ubuntu . . . . . . . . . . . . . . . . . . . . . . 52 Stage 6: Select Your Country and Time Zone . . . . . . . . . . . . . . . . . . 53 Stage 7: Confirm Your Keyboard Layout . . . . . . . . . . . . . . . . . . . . . . 54 Stage 8: Repartition Your Hard Disk . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Stage 9: Enter a Username . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Stage 10: Import Documents and Settings . . . . . . . . . . . . . . . . . . . . 68 Stage 11: Confirm Installation Choices . . . . . . . . . . . . . . . . . . . . . . . 69 Stage 12: Wait During Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Stage 13: Reboot and Enjoy Ubuntu! . . . . . . . . . . . . . . . . . . . . . . . . . 71 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
- 11. ■C O N T E N T S ix ■CHAPTER 6 Solving Installation Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Preinstallation Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Installation Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Postinstallation Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Graphical Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 Using the Screens and Graphics Utility . . . . . . . . . . . . . . . . . . . . . . . 86 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 PART 3 ■■■ The No-Nonsense Getting Started Guide ■CHAPTER 7 Booting Ubuntu for the First Time . . . . . . . . . . . . . . . . . . . . . . . . 97 Starting Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Logging In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Exploring the Desktop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 First Impressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 Shutting Down or Restarting Ubuntu . . . . . . . . . . . . . . . . . . . . . . . . 103 Desktop Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Quick Desktop Guides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Running Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 Working with Virtual Desktops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 Using the Mouse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Cutting and Pasting Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 ■CHAPTER 8 Getting Everything Up and Running . . . . . . . . . . . . . . . . . . . . . 117 Ubuntu Hardware Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Proprietary vs. Open-Source Drivers . . . . . . . . . . . . . . . . . . . . . . . . 118 Installing Device Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 How to Configure Ubuntu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 Using the Command Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Installing Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
- 12. x ■C O N T E N T S Getting Online . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Using NetworkManager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Configuring an Ethernet Network Device . . . . . . . . . . . . . . . . . . . . . 125 Connecting to a Wireless Network . . . . . . . . . . . . . . . . . . . . . . . . . . 128 Installing Windows Wireless Network Device Drivers . . . . . . . . . . 131 Using Dial-Up Telephone Modems . . . . . . . . . . . . . . . . . . . . . . . . . . 141 Working with a Proxy Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 Configuring Power-Saving Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Using Power-Management Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Spinning Down the Hard Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 Adding a Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Configuring a Local Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Configuring a Network Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 Configuring a Windows/SMB Shared Printer . . . . . . . . . . . . . . . . . . 154 Administering a Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 Using Digital Cameras, MP3 Players, and USB Memory Sticks . . . . . . . 157 Configuring a Scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 Installing 3D Drivers and Activating Desktop Visual Effects . . . . . . . . . 160 Configuring Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 Pairing Bluetooth Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 Transferring Files Between Bluetooth Devices . . . . . . . . . . . . . . . . 164 Using a Bluetooth Keyboard or Mouse . . . . . . . . . . . . . . . . . . . . . . . 166 Configuring Sound Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 Configuring E-Mail and Instant Messaging . . . . . . . . . . . . . . . . . . . . . . . 169 Configuring E-Mail Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 Setting Up Instant Messaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 ■CHAPTER 9 How to Secure Your Computer . . . . . . . . . . . . . . . . . . . . . . . . . . 175 Windows Security vs. Linux Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 Root and Ordinary Users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177 Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 Setting Up for Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 Encrypting and Decrypting Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 Signing and Encrypting E-Mail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
- 13. ■C O N T E N T S xi Common-Sense Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 Online Updates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197 Configuring the Ubuntu Firewall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Installing Firestarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 Configuring Firestarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Adding Virus Scanning to Ubuntu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207 Installing ClamTk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 Updating the ClamAV Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 Scanning for Viruses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209 Dealing with Infections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 ■CHAPTER 10 Personalizing Ubuntu: Getting Everything Just Right . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 Changing the Look and Feel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 Altering the Theme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 Changing the Wallpaper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 Setting Font Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 Configuring General Interface Options . . . . . . . . . . . . . . . . . . . . . . . 224 Using Desktop Visual Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225 Configuring Input Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233 Configuring Mouse Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233 Changing Keyboard Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 Creating Keyboard Shortcuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240 Personalizing Login Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240 Changing Your Login Picture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245 Adding and Removing Desktop Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246 Adding a Shortcut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246 Personalizing the Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 Adding and Removing Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249 Moving Panel Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 Working with Applets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
- 14. xii ■C O N T E N T S ■CHAPTER 11 Ubuntu Replacements for Windows Programs . . . . . . . . . . 257 Available Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257 A Quick Start with Common Linux Programs . . . . . . . . . . . . . . . . . . . . . 259 Word Processing: OpenOffice.org Writer . . . . . . . . . . . . . . . . . . . . . 260 Spreadsheet: OpenOffice.org Calc . . . . . . . . . . . . . . . . . . . . . . . . . . 261 Presentations: OpenOffice.org Impress . . . . . . . . . . . . . . . . . . . . . . 263 Database: OpenOffice.org Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264 E-Mail/Personal Information Manager: Evolution . . . . . . . . . . . . . . 265 Web Browser: Firefox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266 Audio Playback: Rhythmbox and Sound Juicer . . . . . . . . . . . . . . . . 268 Movie Playback: Totem Movie Player . . . . . . . . . . . . . . . . . . . . . . . . 269 CD/DVD Burning: Nautilus and Brasero . . . . . . . . . . . . . . . . . . . . . . 270 Photo Editing: The GIMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271 Other Handy Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278 ■CHAPTER 12 Managing Your Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 Understanding File System Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 Drive References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 Names of Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280 File Access and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281 Using Nautilus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283 Searching for Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 File and Folder Icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287 Special Nautilus Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288 Launching Files and Running Programs . . . . . . . . . . . . . . . . . . . . . . . . . . 289 Accessing Windows Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291 Working with Files in Windows Partitions . . . . . . . . . . . . . . . . . . . . 292 Accessing Networked Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294 Sharing a Folder from Within Ubuntu . . . . . . . . . . . . . . . . . . . . . . . . 297 Accessing Removable Storage Devices . . . . . . . . . . . . . . . . . . . . . . . . . . 298 Working in the Computer Window . . . . . . . . . . . . . . . . . . . . . . . . . . 298 Ejecting Media. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
- 15. ■C O N T E N T S xiii PART 4 ■■■ The Shell and Beyond ■CHAPTER 13 Introducing the BASH Shell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303 What Is the BASH Shell? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303 Why Bother with the Shell? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305 When Should You Use the Shell? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307 Getting Started with the Shell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307 Running Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309 Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310 Running the Shell via a Virtual Console . . . . . . . . . . . . . . . . . . . . . . 311 Working with Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313 Listing Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314 Copying Files and Directories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316 Moving Files and Directories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316 Deleting Files and Directories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318 Changing and Creating Directories . . . . . . . . . . . . . . . . . . . . . . . . . . 319 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320 ■CHAPTER 14 Understanding Linux Files and Users . . . . . . . . . . . . . . . . . . . 321 Real Files and Virtual Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321 Users and File Permissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324 Viewing Permissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325 Altering Permissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330 Changing the Ownership of a File . . . . . . . . . . . . . . . . . . . . . . . . . . . 331 The File System Explained . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337 Using the mount Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337 Mounting a Drive Manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338 Removing a Mounted System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340 File Searches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342 Using the find Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342 Using the locate Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343 Using the whereis Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344 File Size and Free Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344 Viewing File Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344 Finding Out the Amount of Free Space . . . . . . . . . . . . . . . . . . . . . . 345 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
- 16. xiv ■C O N T E N T S ■CHAPTER 15 Working with Text Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347 Viewing Text Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347 Using the cat Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347 Using the less Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348 Using the head and tail Commands . . . . . . . . . . . . . . . . . . . . . . . . . 348 Using a Command-Line Text Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 Understanding vim Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351 Using vim to Edit a File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355 Creating a New Text File Using vim . . . . . . . . . . . . . . . . . . . . . . . . . 357 Searching Through Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358 Using grep to Find Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358 Using Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359 Comparing Text Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361 More Text Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364 ■CHAPTER 16 Taking Control of the System . . . . . . . . . . . . . . . . . . . . . . . . . . . 365 Viewing Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365 Controlling Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368 Killing Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369 Controlling Zombie Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370 Using Other Commands to Control Processes . . . . . . . . . . . . . . . . . 371 Controlling Jobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375 ■CHAPTER 17 Cool Shell Tricks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 Using Autocompletion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377 Autocompletion with Files and Paths . . . . . . . . . . . . . . . . . . . . . . . . 378 Viewing Available Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378 Using Keyboard Shortcuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 Shortcuts for Working in BASH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 Shortcuts for System Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380 Using the Command History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381 Piping and Directing Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383 Piping the Output of Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383 Redirecting Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
- 17. ■C O N T E N T S xv PART 5 ■■■ Multimedia ■CHAPTER 18 Digital Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391 Issues Surrounding Multimedia Playback . . . . . . . . . . . . . . . . . . . . . . . . 391 Playing Audio Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393 Installing Codecs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394 Using Rhythmbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397 Purchasing from Online Music Stores . . . . . . . . . . . . . . . . . . . . . . . . . . . 399 Purchasing from Magnatune . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 Using the Jamendo Store. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 Tuning In to Online Radio Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401 Listening to Podcasts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402 Listening to Audio CDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404 Ripping Music from CDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405 Choosing a Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406 Adding MP3-Ripping Support to Sound Juicer . . . . . . . . . . . . . . . . 407 Ripping Tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408 Creating Your Own CDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409 Installing Skype . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 ■CHAPTER 19 Movies and Multimedia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413 Installing Playback Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413 Installing Codecs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414 Installing RealPlayer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416 Adding Flash Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417 Adding Java Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419 Watching Movies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420 Watching DVDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423 Watching TV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426 Checking for Video Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426 Installing tvtime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
- 18. xvi ■C O N T E N T S ■CHAPTER 20 Digital Photos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429 Downloading and Cataloging Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429 Connecting Your Camera . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429 Importing Photos Using F-Spot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430 Image Editing Using GIMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434 The Basics of GIMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440 Making Color Corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442 Cropping and Healing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444 Sharpening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445 Applying Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449 PART 6 ■■■ Office Tasks ■CHAPTER 21 Making the Move to OpenOffice.org . . . . . . . . . . . . . . . . . . . . . 453 Office Similarities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453 OpenOffice.Org Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454 File Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455 The Right Fonts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458 Copying Windows Fonts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458 Installing TrueType Core Fonts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461 ■CHAPTER 22 OpenOffice.org Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463 Introducing the Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463 Customizing the Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465 Adding Functions to Toolbars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465 Adding a New Toolbar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467 Customizing Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468 Configuring OpenOffice.org Options . . . . . . . . . . . . . . . . . . . . . . . . . 469 Using OpenOffice.org Core Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474 Using Wizards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474 Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474 Inserting Objects with Object Linking and Embedding . . . . . . . . . . 474 Creating Macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475 Saving Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477
- 19. ■C O N T E N T S xvii ■CHAPTER 23 In Depth: Writer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479 Formatting Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479 The Formatting Toolbar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479 Context Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480 The Style and Formatting Palette . . . . . . . . . . . . . . . . . . . . . . . . . . . 481 Spell-Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 481 Inserting Pictures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483 Working with Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484 Mail Merging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486 Adding Headers and Footers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 489 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 490 ■CHAPTER 24 In Depth: Calc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491 Entering and Formatting Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491 Deleting and Inserting Data and Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . 492 Working with Formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493 Using the Function Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493 Summing Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494 Sorting Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495 Creating Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 496 Using Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 498 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499 ■CHAPTER 25 In Depth: Impress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501 Creating a Quick Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501 Working in Impress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503 Animating Slides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504 Applying Fontwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506 Using 3D Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507 Exporting a Presentation As a Flash File . . . . . . . . . . . . . . . . . . . . . . . . . 509 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510
- 20. xviii ■C O N T E N T S ■CHAPTER 26 In Depth: Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511 Getting Started with Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511 Creating a Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 514 Adding a Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 514 Creating a Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 516 Adding Controls to the Form Manually . . . . . . . . . . . . . . . . . . . . . . . 517 Editing the Database Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518 Using the Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520 ■CHAPTER 27 In Depth: Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521 Evolution Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521 Basic E-Mail Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523 Sending and Receiving E-Mail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 524 Reading E-Mail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 526 Deleting Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 526 Flagging Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 527 Composing a Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 528 Creating an E-Mail Signature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529 Advanced E-Mail Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530 Creating New Folders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 531 Dealing with Junk E-Mail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 532 Sorting and Filtering Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 532 Creating Search Folders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 533 Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 535 Adding or Editing Contact Information . . . . . . . . . . . . . . . . . . . . . . . 535 Creating a Contact List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537 Calendars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537 Specifying Appointment Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537 Adding or Editing a Diary Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 538 Memos and Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 540 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 541
- 21. ■C O N T E N T S xix PART 7 ■■■ Keeping Your System Running ■CHAPTER 28 Installing and Removing Software . . . . . . . . . . . . . . . . . . . . . . 545 Software Installation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 545 Formats of Linux Installation Files . . . . . . . . . . . . . . . . . . . . . . . . . . 546 Package Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 547 Dependency Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 548 Software Repositories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549 The Synaptic Package Manager in Depth . . . . . . . . . . . . . . . . . . . . . . . . 553 Searching for Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 553 Installing Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555 Removing Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 557 Package Management from the Command Prompt . . . . . . . . . . . . . . . . 558 Using dpkg. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 558 Using the APT Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 561 Managing Software Repositories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 565 Using Software Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 566 Adding/Removing a Repository at the Command Line . . . . . . . . . . 568 Installing from Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569 Installing the Compiler Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569 Unpacking the Source Tarball and Solving Dependencies . . . . . . . 570 Compiling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 571 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 573 ■CHAPTER 29 Managing Users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 575 Understanding User and Group Accounts . . . . . . . . . . . . . . . . . . . . . . . . 575 Users and Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 575 Root User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 576 UIDs and GIDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 577 Adding and Deleting Users and Groups . . . . . . . . . . . . . . . . . . . . . . . . . . 577 Adding and Deleting Users via the GUI . . . . . . . . . . . . . . . . . . . . . . . 578 Creating and Deleting Groups via the GUI . . . . . . . . . . . . . . . . . . . . 580 Adding and Deleting Users and Groups at the Command Line . . . 580 Adding and Changing Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 583 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 584
- 22. xx ■C O N T E N T S ■CHAPTER 30 Optimizing Your System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585 Speeding Up Booting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585 Reducing the Boot Menu Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 586 Enabling Automatic Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 587 Managing GNOME Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589 Prelinking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593 Configuring Prelinking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594 Deactivating Prelinking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594 Freeing Up Disk Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596 Emptying the /tmp Folder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596 Emptying the Cache of Package Files . . . . . . . . . . . . . . . . . . . . . . . 597 Removing Unused Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 597 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 598 ■CHAPTER 31 Backing Up Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599 What Data Should You Back Up? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599 Using Simple Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 601 Backing Up Data via Simple Backup . . . . . . . . . . . . . . . . . . . . . . . . 601 Restoring Data via Simple Backup . . . . . . . . . . . . . . . . . . . . . . . . . . 605 Making Backups from the Command Line . . . . . . . . . . . . . . . . . . . . . . . . 606 Creating tar Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 606 Compressing tar Archives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 607 Extracting Files from a tar Archive . . . . . . . . . . . . . . . . . . . . . . . . . . 608 Viewing tar Archive Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 608 Saving the File to a CD-R/RW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 609 Saving the File to a DVD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 611 ■CHAPTER 32 Scheduling Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613 Scheduling with cron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613 Creating a Scheduled Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613 Scheduling with anacron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 616 Using at to Schedule One-Off Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618
- 23. ■C O N T E N T S xxi ■CHAPTER 33 Accessing Computers Remotely . . . . . . . . . . . . . . . . . . . . . . . . . . . 619 Using Secure Shell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 619 Logging In to a Remote Computer . . . . . . . . . . . . . . . . . . . . . . . . . . 620 Transferring Files Between Remote Computers . . . . . . . . . . . . . . . 623 Accessing GUI Applications Remotely . . . . . . . . . . . . . . . . . . . . . . . . . . . 626 Running X Applications on a Remote Computer . . . . . . . . . . . . . . . 626 Accessing Ubuntu via Remote Desktop . . . . . . . . . . . . . . . . . . . . . . 627 Connecting to Remote Windows Computers . . . . . . . . . . . . . . . . . . . . . . 629 Connecting to Windows Vista . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629 Connecting to Windows XP Professional, 2000, and NT . . . . . . . . 630 Connecting to Other Computers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632 PART 8 ■■■ Appendixes ■APPENDIX A Glossary of Linux Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635 ■APPENDIX B BASH Command Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 657 ■APPENDIX C Getting Further Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 671 ■APPENDIX D Exploring the DVD-ROM and Other Ubuntu Versions . . . . 681 ■INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695
- 25. About the Authors ■KEIR THOMAS is an award-winning author who has written several best-selling Linux titles for Apress. A former computer magazine editor, he has been writing about computers, operating systems, and software for a decade. He has also served as editor on several computer books. His works have been translated into many languages. Keir lives on the side of a mountain in England, and his hobbies include hiking and playing musical instruments. ■JAIME SICAM occasionally works as an IT instructor and consultant. Prior to his hiatus from working full time, he indulged himself as one of the system administrators in the engineering team of Defender Technologies Group. Jaime takes pride in being part of DOST-ASTI (Advanced Science and Technology Institute) on Bayanihan Linux. His team advocated the use of open source software for the computing needs of govern- ment agencies, schools, and small and medium–size enterprises in the Philippines. He enjoys technology, road trips, and keeping up- to-date on news of the Utah Jazz. xxiii
- 27. About the Technical Reviewers ■DANIEL JAMES is a cofounder of 64 Studio Ltd., a company special- izing in the creation of custom Debian and Ubuntu GNU/Linux distributions, focusing on multimedia performance. He was formerly the editor of LinuxUser & Developer magazine, and the original director of the linuxaudio.org consortium. He is an occasional contributor to Linux Format and Sound on Sound magazines. ■ERIC HEWITT is an Ubuntu community member and developer. He’s involved in the development and testing of BUMPS, the Ubuntu multimedia metapackage project, and is the sole developer for Vive, the FFmpeg front end. xxv
- 29. Acknowledgments B ooks like the one you’re holding now take an enormous amount of work by a lot of people to come into fruition. To this end, I’d like to acknowledge the help of the following individ- uals who have contributed to this edition, as well as various earlier editions: Chris Mills, Emily Wolman, Marilyn Smith, Heather Lang, Laura Esterman, Ellie Fountain, Jason Gilmore, Frank Pohlmann, Beth Christmas, Sofia Marchant, Richard Dal Porto, and Julie Miller. I’d also like to thank the technical reviewers who have been involved with editions of this book: Eric Hewitt, Frank Pohlmann, John Hornbeck, and Daniel James. Keir Thomas First of all, I am very thankful to the universe for this opportunity to co-write this book with Keir Thomas. Specifically, thanks to Keir Thomas, Frank Pohlmann, Beth Christmas, Laura Esterman, and Mary Ann Tan for making this possible. Thanks to my friends and family for their love and support. Lastly, I would like to acknowledge my dear Anna Maria Pineda, friend and confidant. Jaime Sicam xxvii
- 31. Preface L inux has come a long way in a short time. Computing itself is still relatively young by any standard; if the era of modern computing started with the invention of the microchip, it’s still less than 50 years old. But Linux is a youngster compared even to this; it has been around for only 17 of those years. In that brief time span, a student’s personal project has grown to where it now runs many computers throughout the world. It has rampaged through the computing industry, providing an alternative to commercial solutions such as those offered by Microsoft, and toppling long- held beliefs about the way things should be done. This is all by virtue of the fact that Linux is simply better than every other choice out there. Many argue that it’s more secure and faster than other operating systems. But here’s the kicker—Linux is free of charge. Yes, that’s right. It doesn’t have to cost a penny. It is one of the computing industry’s best-kept secrets. I was bitten by the Linux bug in the mid-1990s. I was introduced to it by a friend who sold it to me as a kind of alternative to DOS. At that time, I typed a few commands at the prompt and was greeted by error messages. I must admit that I was put off. But shortly afterwards, I revisited Linux and quickly became hooked. Yet getting used to Linux wasn’t easy. I read as many books as I could, but they weren’t very helpful to me. They were usually overly complicated or simply irrelevant. To start off, I didn’t want to know how to create a program that could parse text files. I just wanted to know how to copy and delete files. I didn’t want to set up a web server. I just wanted to know how to play my MP3 tracks and browse the Web. This book is my answer to the need for a fundamental, authoritative, and down-to- earth guide to Linux, done in the context of one of the most popular flavors of Linux in existence today. It’s a book that is desperately needed in our modern world, especially as Linux becomes more and more popular and enters homes and workplaces. Beginning Ubuntu Linux, Third Edition purely and simply focuses on what you need to know to use Linux. It’s concise and to the point, aiming to re-create under Linux all the stuff you used to do under Windows, or even Apple Macintosh. But don’t think that this means Beginning Ubuntu Linux, Third Edition cuts corners. Wherever justified, this book spends time examining the topics you need to know in order to gain a complete and compre- hensive understanding. For example, you’ll find a hefty chapter looking at the command-line prompt—arguably the heart of Linux and the element that gives Linux most of its power. There’s also an entire chapter discussing (and illustrating) how to initially install Ubuntu on your computer. Beginning Ubuntu Linux, Third Edition really is a complete guide. Keir Thomas, June 2008 xxix
- 33. Introduction L inux applies an alternative philosophy to computing that revolves around the sharing of not only software but also knowledge. To use Linux is to become part of a huge global community of people who have caught on to a phenomenon that is changing the world. Ubuntu (www.ubuntulinux.org) is the natural continuation of these goals. It’s a project founded by entrepreneur businessman Mark Shuttleworth with the intention of bringing a freely available, high-quality operating system to the world. To this end, Shuttleworth invested $10 million of his own money to guarantee that this will be the case for many years to come. The fundamental concept is that Ubuntu is available for use by anyone in the world, no matter who they are or where they are. As such, many different languages are supported, and the operating system can also be accessed by those with disabilities, such as partial sight or hearing. Ubuntu might just as easily be found on a Wall Street banker’s laptop as on a battered, old computer in a Brazilian favela. Ubuntu is built around one of the most established versions of Linux: Debian (www.debian.org). The Debian Project was started back in 1993, shortly after the very first version of the Linux software was released, and has become one of the pioneering varieties of Linux. Ubuntu and Debian Linux both share common goals and are closely allied, but Ubuntu focuses largely on the desktop. It provides a powerful office suite by default, for example, as well as some excellent pieces of Internet software. It is only recently that a dedicated server version has become available. It’s also very easy to use. Ubuntu works straight out of the box. As soon as it’s installed, you should be ready to start using it without any further work. In addition, tasks such as updating your software are as easy under Ubuntu as they are under Windows. Above all, however, Ubuntu is designed to be shared. You can take the DVD-ROM included with this book and install Ubuntu on as many computers as you want. You can also copy it as many times as you want and give those copies to your friends. We’re serious! This isn’t some kind of trick either—Ubuntu isn’t a trial version that will quit running in a month. You will never find yourself having to pay a fee further down the line, even if you want to install additional software. Ubuntu will always be free of charge. Since its inception in 2004, Ubuntu has literally taken the world of Linux by storm, and has even broken out of the technically demanding world of open source software. It’s consistently voted the most popular desktop Linux, and has even garnered a handful of celebrity users along the way: Jamie Hyneman of the popular TV show MythBusters is a fan, as is novelist and blogger Cory Doctorow. Within some Internet communities, such as Digg.com and Reddit, you’ll struggle to find individuals who don’t use Ubuntu. xxxi
- 34. xxxii ■I N T R O D U C T I O N Ubuntu's popularity has been echoed in corporate interest: Dell (www.dell.com) now offers a range of computers with Ubuntu preinstalled, as does System 76 (http://system76.com) and, in the United Kingdom, Tesco (www.tesco.com). What You’ll Find in This Book Beginning Ubuntu Linux, Third Edition is divided into eight parts, each of which contains chapters about a certain aspect of Ubuntu use. These parts can be read in sequence, or you can dip in and out of them at will. Whenever a technical term is mentioned, a refer- ence is made to the chapter where that term is explained. Part 1 examines the history and philosophy behind the Linux operating system. We aim to answer many of the common questions about Linux. Such knowledge is considered to be as important, if not more so, than understanding the technical details on how Linux works. But while these chapters should be read sooner rather than later, they don’t contain any technical information that you absolutely require to get started with Ubuntu. Part 2 covers installing Ubuntu on your computer. An illustrated guide is provided, and all installation choices are explained in depth. Additionally, you’ll find a problem-solving chapter to help, just in case anything goes wrong. Part 3 focuses on getting started with Ubuntu. It covers setting up the Linux system so that it’s ready to use. One chapter is dedicated to setting up common hardware devices, such as printers, and another explains how you can secure your system. Other chapters in this part explore the desktop, explaining what you need to know to begin using Ubuntu on a daily basis. In Part 4, we take a look at how the underlying technology behind Linux functions. You’re introduced to the command-line prompt, and you learn how the file system works. It’s in these chapters that you’ll really master controlling Linux! Part 5 covers multimedia functions available for Ubuntu users, which let you watch movies and play back music. We also take a look at the image-editing software built into Ubuntu. Part 6 moves on to explain how typical office tasks can be accomplished under Ubuntu. We investigate OpenOffice.org, the complete office suite built into Ubuntu. After an intro- duction to OpenOffice.org, separate chapters explore its word processor, spreadsheet, database, and presentation package. You also learn how to use the Evolution e-mail and personal information manager program. Part 7 carries on from Part 4 and takes an even more in-depth look at the underlying technology behind Ubuntu. This time, the emphasis is on giving you the skills you need to keep your system running smoothly. You learn how to install software, manage users, opti- mize your system, back up essential data, schedule tasks, and access computers remotely.
- 35. ■I N T R O D U C T I O N xxxiii Finally, Part 8 contains four appendixes. The first is a glossary of Linux terms used not only in this book but also in the Linux and Unix worlds. The second appendix is a quick reference to commands typically used at the command-line prompt under Linux. The third appendix explains how to get further help when using Ubuntu, and the fourth explains how to use the DVD-ROM and the differences between the various versions of Ubuntu. What’s New in the Third Edition The original edition of Beginning Ubuntu Linux was the first English-language book to provide a guide to using Ubuntu, and it remains one of the best. Successive editions of the book have tracked the changes within the Ubuntu project, and improved each time. This third edition of Beginning Ubuntu Linux has been thoroughly updated and revised to take into account improvements introduced with the 8.04 Long Term Support (LTS) release of Ubuntu (code-named Hardy Heron). The previous edition covered the 6.10 release. The changes introduced with the 8.04 release, as well as some of the improvements in versions between 8.04 and 6.10, are sometimes subtle but often dramatic. Take automated multi- media setup, for example. This now makes it a piece of cake to play back virtually any kind of video or audio file. How it works is fully explained in Chapters 18 and 19. Desktop visual effects have also been introduced, so that windows can be made to wobble and shake, or just shrink visibly to the Taskbar, aiding usability significantly. This is explained in Chapters 8 and 10. Security has been beefed up significantly, and encryption is now a standard feature of Ubuntu (and is astonishingly easy to use as well). This is explained in depth in Chapter 9, along with other security improvements. About the DVD-ROM Supplied with This Book The DVD-ROM attached to the book is completely new, compared to that offered with the first and second editions. This edition offers a double-sided DVD-ROM that contains virtually every official release of Ubuntu 8.04, including not only the main Ubuntu release, but also Kubuntu, Edubuntu, Xubuntu, and some releases for alternative hardware platforms, such as older PowerPC-based Macintosh computers. By booting from the DVD-ROM, you can opt to install Ubuntu or run in “live” mode, which means that the entire operating system boots from the disc and doesn’t touch your hard disk. This can be useful for those who wish to “try out” Ubuntu, but there are a handful of caveats, which we explain in Chapter 5. The contents of the DVD-ROM are explained in detail in Appendix D.
- 36. xxxiv ■I N T R O D U C T I O N Conventions Used in This Book The goal when writing Beginning Ubuntu Linux was to make it as readable as possible while providing the facility for readers to learn at their own pace. Throughout the book, you’ll find various types of notes and sidebars complementing the regular text. These are designed to provide handy information to help further your knowledge. They also make reading the book a bit easier. ■Note A note is designed to provide an important piece of information that you should know and that will help your understanding of the topic being discussed. ■Tip A tip is something that will help when you need to perform the task being described. Alternatively, it might be something that can make your life easier when using Ubuntu. ■Caution A caution is something you should certainly pay attention to, because it warns of a hidden danger or particular caveat that applies to the topic being discussed. In the sidebars, we take a moment to explain something that you should know, but that isn’t vital to an understanding of the main topic being discussed. You don’t need to read the sidebars there and then; you can return to them later if you wish.
- 37. PART 1 ■■■ Introducing the World of Linux
- 39. CHAPTER 1 ■■■ Welcome! I f you’re an avid computer user, there’s a good chance that you’ve heard of Linux. You might have read about it, or perhaps you’ve seen TV ads that refer to it. One of the odd things about Linux is that the more you learn about it, the more ques- tions you have. For instance, it’s generally thought that Linux is free of charge, but this then raises the question of how, in our modern world, something like an entire computer operating system can cost nothing. Who pays the programmers? Over the following introductory chapters, we’re going to try to answer some of these questions. In this chapter, we’ll explain what Linux is and its benefits compared to Windows. What Is Linux? There are two ways of looking at a PC. The first is to see it as a magical box, which lets you do cool stuff like browse the Internet or play games. Seen in this way, it’s like a VCR—put in a tape, press a button, and a picture appears on your TV. On your PC, you click the Internet Explorer icon, type a web address, and a web site somehow appears. The astonishing technical complexity behind these simple procedures isn’t important to most people. The other way of looking at a PC is as a collection of components that are made by various manufacturers. You might be familiar with this way of thinking if you’re ever tried to upgrade your PC’s hardware. In that case, you’ll know that your PC consists of a CPU, a hard disk, a graphics card, and so on. You can swap any of these out to put in newer and better components that upgrade your PC’s performance or allow more data storage. What almost no one realizes is that the operating system is just another component of your PC. It, too, can be swapped out for a better replacement. Windows doesn’t come free of charge, and Microsoft isn’t performing a public service by providing it. Around $50 to $100 of the price you pay for a PC goes straight into Microsoft’s pocket. Bearing in mind that hundreds of millions of PCs are made each year, it’s not hard to see why Microsoft is one of the world’s richest corporations. It would be difficult to question this state of affairs if Microsoft gave us our money’s worth. But it often falls far short. Its products are full of serious security holes, which at best inconvenience us and at worst make us lose data. 3
- 40. 4 CHAPTER 1 ■ WELCOME ! Microsoft became rich, and maintains its wealth, by a virtual monopoly over PC manu- facturers. While the intelligent computer buyer can choose between components to put together a better PC—deciding between an AMD or Intel processor, for example—you usually have little choice but to buy Windows with a new PC. Try it now. Phone your favorite big-name computer retailer. Say that you want a PC but you don’t want Windows installed. Then listen as the salesperson on the other end of the phone struggles to understand. ■Note Some PC manufacturers actually will sell you a PC without Windows installed on it. All you have to do is ask, although you might need to speak to a senior salesperson to get through to someone who under- stands your request. Smaller local companies, in particular, will be more than willing to sell you a PC without Windows. Some larger multinational companies, such as Hewlett-Packard, sell workstations with Linux preinstalled instead of Windows. However, these computers are usually aimed at businesses rather than home users. Wouldn’t it be terrific if you could get rid of Windows? Would you like to finally say goodbye to all those security holes and not have to worry about virus infections anymore, yet not lose out on any features or need to make sacrifices or compromises? There is an alternative. Welcome to the world of Linux. Linux is an operating system, which is to say that it’s a bit like Windows. It’s the core software that runs your computer and lets you do stuff on it. By the strictest definition of the term, an operating system is the fundamental software that’s needed to make your PC work. Without an operating system installed on your PC, it would merely be an expensive doorstop. When you turned it on, it would beep in annoyance—its way of telling you that it can’t do much without a whole set of programs to tell it what to do next. An operating system allows your PC’s hardware to communicate with the software you run on it. It’s hundreds of programs, system libraries, drivers, and more, all tightly integrated into a whole. In addition, an operating system lets programs talk to other programs and, of course, communicate with you, the user. In other words, the operating system runs everything and allows everything to work. ■Note Some companies and individuals, including Microsoft, define an operating system as much more than this fundamental software. They add in the basic tools you run on an operating system, such as web browsers and file management programs. Linux consists of a central set of programs that run the PC on a low level, referred to as the kernel, and hundreds (if not thousands) of additional programs provided by other people and various companies. Technically speaking, the word “Linux” refers explicitly to
- 41. C HAPTE R 1 ■ WELCOME! 5 the core kernel program. However, most people generally refer to the entire bundle of programs that make up the operating system as “Linux.” GNU/LINUX Although most of us refer to Linux as a complete operating system, the title “Linux” hides a lot of confusing but rather important details. Technically speaking, the word “Linux” refers merely to the kernel file: the central set of programs that lie at the heart of the operating system. Everything else that comes with a typical version of Linux, such as programs to display graphics on the screen or let the user input data, is supplied by other people, organizations, or companies. The Linux operating system is the combination of many disparate projects. (We’ll explain how this works in the next chapter.) The GNU organization, in particular, supplies a lot of vital programs and also system library files, without which Linux wouldn’t run. These programs and files were vital to the acceptance of Linux as an operating system in its early days. Because of this, and the fact that Linux completed a long-running goal of the GNU project to create a Unix-like operating system, some people choose to refer to Linux as GNU/ Linux. A fierce debate rages over the correct way to refer to the Linux operating system and whether the GNU prefix should be used. For what it’s worth, an equally fierce debate rages over how we should define an operating system. It can all get very confusing. It’s also very easy to accidentally offend someone by not using the correct terminology! It’s not the purpose of this book to get involved in this debate. Suffice it to say that we acknowledge the vital input of the GNU project into the operating system many people refer to simply as Linux, as well as that of other vital projects. However, readers should note that when we refer to Linux throughout this book, we mean the entire operating system. If we intend to refer simply to the kernel programs, we will make that clear. The Age of Linux At the time of writing this book, Linux is a little over 15 years old. It has gone from a hobbyist project maintained by just one man to a professional and corporate-sponsored solution for virtually every level of computer user. Linux has also gone from being a server operating system, designed for central computers that hand out files and other computer resources to other computers, to becoming a full- fledged graphical desktop operating system like Windows. In fact, it’s gone even further. Today, it’s very likely that you’ll find Linux running your digital video recorder and other computerized household gadgets. Getting technical for a moment, Linux is a 32-bit and 64-bit, multitasking, multiuser operating system. This is a complicated way of saying that it’s pretty darn powerful. Linux is as capable of running supercomputers as it is of running a desktop PC. Linux builds on
- 42. 6 CHAPTER 1 ■ WELCOME ! the foundation laid by Unix, which itself was based on Multics, which was one of the first modern computer operating systems. It’s not an exaggeration to say that Linux can trace its family tree all the way back to the pioneering days of computing. CORRECT PRONUNCIATION What most people refer to as the Linux operating system takes its name from the kernel program, one of its most important system components. This, in turn, was named after its creator, Linus Torvalds. The name Linus is commonly pronounced “Lie-nus” in many English-speaking countries, but Torvalds speaks Swedish. He pronounces his name “Leen-us” (imagine this spoken with a gentle Scandinavian lilt, and you’ve got it about right). Because of this, he pronounces Linux as “Lin-ux”, and most people copy this pronunciation. You can hear this spoken by Torvalds himself by visiting www.paul.sladen.org/pronunciation/. Some people refer to the Linux operating system by its full title of GNU/Linux. In this case, GNU is pronounced as in the name of the animal, with a hard G: “G-noo.” The full pronunciation is therefore “G-noo Lin-ux.” Finally, the DVD that comes with this book contains a version of Linux called Ubuntu. This is an African word that, in its country of origin, is pronounced in three separate short syllables: “oo-bu-ntoo.” However, most western English speakers pronounce the word “oo-bunt-oo,” which is perfectly acceptable! The Problems with Windows The world’s most popular operating system is Windows, which is made by the Microsoft Corporation. Linux has no links with Windows at all. Microsoft doesn’t contribute anything to Linux and, in fact, is rather hostile toward it, because it threatens Microsoft’s market dominance. This means that installing Linux can give you an entirely Microsoft-free PC. How enticing does that sound? Windows is used on 91 percent of the world’s desktop computers. In other words, it must be doing a good job for it to be so popular, right? Let’s face facts. On many levels, Windows is a great operating system, and since the release of Windows XP in particular, Microsoft has cleaned up its act. Windows XP does a much better job compared to previous versions of Windows (and Vista makes even more improvements). But the situation is far from perfect. Windows XP is notoriously insecure and virtually every day a new security hole is uncovered. The United States Computer Emergency Readiness Team (www.us-cert.gov ) reported 812 security vulnerabilities for Microsoft Windows during 2005. That’s 15 vulnerabilities per week! In June 2005, the computer security company Sophos (www.sophos.com) advertised that its Windows anti- virus program defended against over 103,000 viruses!
- 43. C HAPTE R 1 ■ WELCOME! 7 This has led to an entire industry that creates antivirus programs, which are additional pieces of software you have to install once your computer is up and running for it to run without the risk of data loss or data theft. ■Note Unlike many books, Beginning Ubuntu Linux doesn’t ignore Windows. Throughout its pages, you’ll find frequent references to Windows and the software that runs under it. You’ll find direct comparisons with actual Windows programs, and you’ll learn how to work with Windows files. The intention is that anyone with prior experience will be able to get started with Ubuntu much more quickly. So is Linux the solution to these problems? Most would agree that it’s a step in the right direction, at the very least. Most Linux users don’t install antivirus programs, because there are virtually no Linux-specific viruses. As with all software, security holes are occa- sionally discovered in Linux, but the way it is built means exploiting those holes is much more difficult. ■Note There have been a couple of viruses for Linux, but they’re no longer “in the wild” (that is, they are no longer infecting PCs). This is because the security holes they exploited were quickly patched, causing the viruses to die out. This happened because the majority of Linux users update their systems regularly, so any security holes that viruses might exploit are patched promptly. Compare that to Windows, where most users aren’t even aware they can update their systems, even when Microsoft gets around to issuing a patch (which has been known to take months). There’s also the fact that Linux encourages you to take control of your computer, as opposed to treating it like a magical box. As soon as you install Linux, you become a power user. Every aspect of your PC is under your control, unlike with Windows. This means fixing problems is a lot easier, and optimizing your system becomes part and parcel of the user experience. ■Tip There’s no reason why Linux and Windows can’t live side-by-side on the same computer. This can be done by dual-booting, and we explain how in Chapter 5.
- 44. 8 CHAPTER 1 ■ WELCOME ! WINDOWS COMPATIBLE? One of the biggest questions asked by most newcomers to Linux is whether it can run Windows soft- ware. The answer is yes . . . and no. Linux is completely different from Windows on a fundamental technical level. Its creators based it on Unix, an industrial-strength operating system, and deliberately steered clear of emulating Windows. This means that Linux isn’t a swap-in replacement for Windows. You cannot take the installation CD of a Windows program and use it to install that program on Linux, in the same way that you cannot install an Apple Mac program on Windows. However, several current projects let you run Windows programs on Linux. Wine (www.winehq.com) is an example of such a project, and you can download a commercial and easy-to-use variation of it from www.codeweavers.com. You can also use programs like VMware (www.vmware.com) to create a “virtual PC” running on Linux. Then you can install the Windows operating system and, therefore, any Windows software you like. In most cases, however, you’ll find that there’s a Linux equivalent of your favorite Windows software. Frequently, you’ll find that this Linux version is actually superior to the Windows program you’ve been using. We’ll discuss many of these in Chapter 11. The Benefits of Linux People have been known to exaggerate about Linux when singing its praises, and there’s certainly some hyperbole around. But there are a couple of cast-iron facts about its benefits. Fewer Crashes The experiences of different people vary but, in our extensive experience, Linux very rarely crashes. The mouse cursor has never frozen on screen. A strange error box has never appeared and remained until we’ve rebooted. Program windows don’t freeze and leave trails as we drag them around. It’s possible to leave a Linux system running for years without ever needing to reboot (although most desktop Ubuntu users shut down their PCs when they won’t be using them for a while, just like the rest of us). Of course, programs that run on top of Linux sometimes crash, but they don’t take the rest of the system down with them. Instead, you can clean up after a crash and just carry on. Security The next benefit is that Linux is very secure. It’s built from the ground up to be secure, in fact, and Linux is based on years of proven computer science research. It works on the principle of users who have permissions to undertake various tasks on the system. If you
- 45. C HAPTE R 1 ■ WELCOME! 9 don’t have the correct permission, you cannot, for example, access a particular piece of hardware. Additionally, privacy can be ensured, because the files on the PC are “owned” by individual users, who can permit or deny others access to those files. Free and Shareable Another big benefit is that Linux can be obtained free of charge. Once it’s installed, the latest updates for all your programs are also free of charge. Not only that, but if you want any new software, it will also usually be free of charge (and normally just a download away). Is this starting to sound attractive yet? The software is also released under a license that means you can share it with anybody you want. Suppose that you find a really great image editor. You mention it to a friend, and he asks for a copy. Under Windows, copying the program is strictly illegal—to do so turns you into a software pirate! Unless that image editor is freeware, your friend will need to buy the software himself. Under Linux, sharing software is normally entirely legal. In fact, it’s encouraged! We’ll explain why in Chapter 2. This philosophy of sharing applies to the entire operating system. You can install the software contained on the DVD on the computer of your friends, relatives, or neighbors. You can even give them copies of the DVD. All this can be done entirely legally! In fact, this redistribution is what the makers of Ubuntu want. They created Ubuntu so that it would be shared and used by anybody, anywhere in the world. They’ll even send you or somebody you know free copies of the installation CD if you want; see the ShipIt page of the Ubuntu website: https://shipit.ubuntu.com. No Annoying Copy Protection or Usage Restrictions A happy side effect of the sharing culture that surrounds Linux is that you’ll never need a software registration code to install it. There’s no scheme like Windows Product Activa- tion (WPA), or Windows Genuine Advantage, whereby the software must “phone home” over the Internet to be “activated.” This kind of approach to software, where the creators attempt to fundamentally limit what users can do with the software they’ve bought, is anathema to all those involved in Linux. Linux users are encouraged to play with the software in order to find or create more uses for programs, since Linux is about freedom, rather than restrictions. The Linux Community We’ve established that Linux is powerful, secure, and flexible. It doesn’t nag you to register or ask you to type in lengthy registration codes.
- 46. 10 CHAPTER 1 ■ WELCOME ! But we’ve saved the best for last. Linux is more than a computer operating system. It’s an entire community of users spread across the globe. When you start to use Linux, you become part of this community (whether you like it or not!). One of the benefits of membership is that you’re never far from finding a solution to a problem. The community likes to congregate online around forums and newsgroups, which you can join in order to find help. Your placement in the ranks of the community is “newbie.” This is a popular way of describing someone who is new to Linux. Although this sounds derisory, it will actually help when you talk to others. Advertising your newbie status will encourage people to take the time to help you. After all, they were newbies once upon a time! There’s another reason not to be disheartened by your newbie tag: you’ll outgrow it very quickly. By the time you reach the end of this book, you’ll have advanced to the other end of the spectrum—“guru.” You’ll be one of those giving out the advice to those poor, clueless newbies, and you’ll be 100 percent confident in your skills. ■Tip One of the best ways to learn about Linux is under the auspices of a knowledgeable friend. It’s very beneficial to have your own guru to help you along when you get stuck—someone who is just an e-mail message or phone call away. If you have a friend who uses Linux, consider taking him or her out for a drink and getting more friendly! But being part of a community is not just about getting free technical support. It’s about sharing knowledge. Linux is as much about an ideal as it is about software. It was created to be shared among those who want to use it. There are no restrictions, apart from one: any changes you make and distribute must also be made available to others. The spirit of sharing and collaboration has been there since day one. One of the first things Linus Torvalds did when he produced an early version of Linux was to ask for help from others. And he got it. Complete strangers e-mailed him and said they would contribute their time, skills, and effort to help his project. This has been the way Linux has been developed ever since. Thousands of people around the world contribute their own small pieces, rather than there being one overall company in charge. And the same concept applies to knowledge of Linux. When you learn something, don’t be afraid to share this knowledge with others. “Giving something back” is a very important part of the way of the Linux community. To understand why Linux is shared, you need to understand its history, as well as the history of what came before it. This is the topic of Chapter 2.
- 47. C HAPTE R 1 ■ WELCOME! 11 Summary This chapter provided an introduction to Linux. It explained what Linux can be used for and also its many advantages when compared to Microsoft Windows. It also introduced the community surrounding Linux, which adds to its benefits. You should be starting to realize what makes millions of people around the world use Linux as the operating system of choice. The next chapter covers the history of Linux. It also discusses another curious aspect: the political scene that drives the operating system forward.
- 49. CHAPTER 2 ■■■ A History and Politics Lesson L inux is more than just software. It’s an entire community of users, and as such, there’s a detailed social history behind it. In this chapter, we’ll look at the origins of Linux, both in terms of where it came from and the people who make it. You might be tempted to skip this chapter and move on to the information about installing Ubuntu. To be fair, nothing of vital technical importance is mentioned here. But it’s important that you read this chapter at some stage, because Linux is more than simply the sum of its parts. It’s far more than simply a set of computer programs. If nothing else, this chapter explains the fundamental philosophies behind Linux and attempts to answer some of the often-baffling questions that arise when Linux is considered as a whole. In the Beginning Linux was created 16 years ago, in 1991. A period of 16 years is considered a lifetime in the world of computing, but the origin of Linux actually harks back even further, into the early days of modern computing in the mid-1970s. Linux was created by a Finnish national named Linus Torvalds. At the time, he was studying in Helsinki and had bought a desktop PC. His new computer needed an operating system. Torvalds’s operating system choices were limited: there were various versions of DOS and something called Minix. It was the latter that Torvalds decided to use. Minix was a clone of the popular Unix operating system. Unix was used on huge computers in businesses and universities, including those at Torvalds’s university. Unix was created in the early 1970s and has evolved since then to become what many considered the cutting edge of computing. Unix brought to fruition a large number of computing concepts in use today and, many agree, got almost everything just right in terms of features and usability. Versions of Unix were available for smaller computers like Torvalds’s PC, but they were considered professional tools and were very expensive. This was in the early days of the home computer craze, and the only people who used IBM PCs were businesspeople and hobbyists. 13
- 50. 14 CH APT ER 2 ■ A HI ST O RY AN D PO LI TI CS LESS O N ■Note Linux is a pretty faithful clone of Unix. If you were to travel back in time 20 or 30 years, you would find that using Unix on those old mainframe computers, complete with their teletype interfaces, would be similar to using Linux on your home PC. Many of the fundamental concepts of Linux, such as the file system hierarchy and user permissions, are taken directly from Unix. Torvalds liked Unix because of its power, and he liked Minix because it ran on his computer. Minix was created by Andrew Tanenbaum, a professor of computing, to demonstrate the principles of operating system design to his students. Because Minix was also a learning tool, people could also view the source code of the program—the original listings that Tanenbaum had entered to create the software. But Torvalds had a number of issues with Minix. Although it’s now available free of charge, at the time Minix was only available for a fee, although in many universities, it was possible to obtain copies free of charge from professors who paid a group licensing fee. Nevertheless, the copyright issue meant that using Minix in the wider world was difficult, and this, along with a handful of technical issues, inspired Torvalds to create from scratch his own version of Unix, just as Tanenbaum had done with Minix. ■Note Most clones or implementations of Unix are named so that they end in an “x.” One story has it that Torvalds wanted to call his creation Freax, but a containing directory was accidentally renamed Linux on an Internet server. The name stuck. From day one, Torvalds intended his creation to be shared among everyone who wanted to use it. He encouraged people to copy it and give it to friends. He didn’t charge any money for it, and he also made the source code freely available. The idea was that people could take the code and improve it. This was a master stroke. Many people contacted Torvalds, offering to help out. Because they could see the program code, they realized he was onto a good thing. Soon, Torvalds wasn’t the only person developing Linux. He became the leader of a team that used the fledgling Internet to communicate and share improvements. ■Note The popular conception of Linux is that it is created by a few hobbyists who work on it in their spare time. This might have been true in the very early days. Nowadays, in addition to these “bedroom programmers,” Linux is programmed by hundreds of professionals around the world, many of whom are employed specifically for the task. Torvalds adds to the effort himself and also coordinates the work.
- 51. C HAPT ER 2 ■ A HISTORY AND POLITICS LESS ON 15 It’s important to note that when we talk here about Linux, we’re actually talking about the kernel—the central program that runs the PC hardware and keeps the computer ticking. This is all that Torvalds initially produced back in 1991. It was an impressive achievement, but needed a lot of extra add-on programs to take care of even the most basic tasks. Torvalds’s kernel needed additional software so that users could enter data, for example. It needed a way for users to be able to enter commands so they could manipulate files, such as deleting or copying them. And that’s before you even consider more complicated stuff like displaying graphics on the screen or printing documents. Linux itself didn’t offer these functions. It simply ran the computer’s hardware. Once it booted up, it expected to find other programs. If they weren’t present, then all you saw was a blank screen. LINUS TORVALDS Linus Benedict Torvalds was born in Helsinki, Finland, in 1969. A member of the minority Swedish- speaking population, he attended the University of Helsinki from 1988 to 1996, graduating with a Masters degree in Computer Science. He started Linux not through a desire to give the world a first-class operating system but with other goals in mind. Its inspiration is in part due to Helsinki winters being so cold. Rather than leave his warm flat and trudge through the snow to the university’s campus in order to use its powerful minicomputer, he wanted to be able to connect to it from home! He also wanted to have a platform to use to experiment with the properties of the Intel 386, but that’s another story. Torvalds needed an operating system capable of such tasks. Linux was born. It took Torvalds the better part of a year to come up with the very first version of Linux, during which he worked alone in a darkened room. In 1991, he announced his creation to the world, describing Linux as “just a hobby,” and saying it would never be big. It wouldn’t be until 1994 that it reached version 1.0. In the early days, Torvalds’s creation was fairly primitive. He was passionate that it should be free for everyone to use, and so he released it under a software license that said that no one could ever sell it. However, he quickly changed his mind, adopting the GNU Public License. Torvalds was made wealthy by his creation, courtesy of the dot.com boom of the late 1990s, even though this was never his intention; he was driven by altruism. Nowadays, he lives in Portland, Oregon, with his wife and children, having moved to the United States from Finland in the late 1990s. Initially, Torvalds worked for Transmeta, developing CPU architectures as well as overseeing kernel development, although this wasn’t part of his official work. He still programs the kernel, but currently he over- sees the Open Source Development Lab, an organization created to encourage open source adoption in industry and which is also referred to as the home of Linux.
- 52. 16 CH APT ER 2 ■ A HI ST O RY AN D PO LI TI CS LESS O N The GNU Project Around the time Linus created Linux, another project, called GNU, also existed. This project team also hoped to create an operating system that used Unix as its inspiration, while avoiding some of the pitfalls that had blighted that operating system, both techni- cally and in terms of its licensing. GNU is a so-called recursive acronym that stands for “GNU’s Not Unix,” a play on words favored by computer programmers. GNU’s parent organization, the Free Software Foundation (FSF), had been formed eight years prior to Torvalds’s effort, and since that time, had produced the majority of the core software that Linux desperately needed. However, as luck would have it, FSF lacked the essential functionality of the kernel. The developers were in the process of creating their own kernel, but it had not come to fruition. The GNU software was distributed for free to anyone who wanted it. The source code was also made available, so users could adapt and change the programs to meet their own needs (in fact, Torvalds had used the GNU model when deciding how to distribute Linux). Richard Stallman is the man behind GNU and, along with Linus Torvalds, is the second accidental hero in our story. Stallman had been around since the Dark Ages of computing, back when wardrobe-sized computers were “time-shared” among users who used small desktop terminals to access them. Like Torvalds, Stallman started GNU as a personal project, but then found others who were more than willing to join his cause. ■Note Stallman created the Emacs text editor and the GNU C Compiler (GCC). Together, they allow the creation of yet more software, so it’s no surprise that one of the very first programs Torvalds used in the early days to create Linux was Stallman’s GCC. Back in Stallman’s day at the legendary Massachusetts Institute of Technology (MIT), computer software was shared. If you created a program to perform a particular task, you offered it to practically anyone who wanted it. Alternatively, if you found an existing program wasn’t adequate or had a bug, you improved it yourself, and then made the resulting program available to others. People might use your improved version, or they might not; it was up to them. This way of sharing software was disorganized and done on an ad hoc basis, but came about of its own accord. Nobody questioned it, and it seemed the best way of doing things. There certainly wasn’t any money involved, any more than there would be money involved in one friend explaining an idea to another.
- 53. C HAPT ER 2 ■ A HISTORY AND POLITICS LESS ON 17 RICHARD STALLMAN Richard Matthew Stallman, usually referred to as RMS, was born in 1953 in Manhattan. He comes from the old school of computing forged during the 1970s and was a member of MIT’s legendary Artificial Intelligence Lab. Seemingly destined for a life in academia, Stallman left MIT in 1984 to found the GNU Project. This was as a reaction to the increasing commercialization of computer software. Whereas once all hackers (that is, programmers) had shared ideas and program code, the trend in the 1980s was toward proprietary, nonshared code, as well as legal contracts, which forced programmers to keep secrets from one another. Stallman is a very talented programmer and is considered a genius by many observers. He single-handedly created many essential programming tools in his initial efforts to get GNU off the ground. Many of these find a home in Linux. Stallman is also widely applauded for the creation of the GNU Public License. This is a legal docu- ment that lets people share software. It introduces the concept of copyleft and is opposed to the legal concept of copyright, which attempts to limit the freedom of individuals when using a piece of software (or any other creative work). Nowadays, the concept of copyleft has been applied to literature, music, and other arts in an attempt to avoid restricting who can and cannot access various items, as well as to encourage a collaborative working environment. Proprietary Software and the GPL In the 1980s, everything changed. The world became more corporate, and with the rise of the desktop PC, the concept of proprietary software became prevalent. More and more companies started to sell software. They reasoned that this was impossible to do if they shared it with everybody else, so they kept it secret. Microsoft led this charge and did very well with its proprietary software. To Stallman, this “trade secrets” approach to software was anathema. He had nothing against software being sold for a profit, but he hated the fundamental ideas behind software being kept secret. He felt passionately that sharing software and being able to understand how it worked was akin to free speech—necessary and vital for the furthering of technology, and therefore society itself. How could the new generation of programmers improve on the previous generation’s work if they were unable to see how it worked? It was absurd to need to create software from scratch each time, rather than taking something that already existed and making it better. Because of his beliefs, Stallman resigned from his job in the MIT Artificial Intelligence Lab and founded GNU. His aim initially was to produce a complete clone of Unix that would be shared in the ways he knew from the early days of computing. This software
- 54. 18 CH APT ER 2 ■ A HI ST O RY AN D PO LI TI CS LESS O N would be available for everyone to use, to study, and to adapt. It would be free, in the same sense as free speech— shared and unrestricted. This gave rise to the vital concept of “free software” and soon GNU, and the FSF, became not just a programming venture, but also a political movement. ■Note A very common misconception of “free software” is that it is always free of charge. This isn’t correct. The word free is used here in its political sense, as in “free speech.” Many companies and individuals make a healthy profit from selling free software and, in fact, selling free software is encouraged by the GNU Project. To protect the rights of people to share and adapt the GNU software, Stallman came up with the GNU Public License (GPL). Various drafts of this license were produced over time, until it became a completely watertight legal contract, which furthered the concept of free software. Most software you buy comes with a license agreement—that big chunk of text you must agree to when installing software (in the case of Windows desktop software, it’s frequently referred to as the End-User License Agreement, or EULA). The license agreement usually says that you cannot copy the software or share it with friends. If others want to use the software, they must buy their own version. The GPL turns this on its head. Rather than restricting what people can do with the soft- ware, it gives them permission to share the software with whomever they wish. However, if they modify the program in any way, and then distribute it to others, the program they come up with must also be licensed under the GPL. In other words, people cannot make changes to a program that has a GPL, and then sell the modified program, keeping their improvements secret. ■Note An interesting side note is that the actual wording of the GPL says that any changes you make should be shared with others only if the software is redistributed. This means that if you modify some GPL software and don’t give it to anyone else, there’s no need for you to publish your changes or make others aware of those changes. GNU and Linux Together The Linux kernel, developed by Torvalds, and the GNU software, developed by Stallman, were a perfect match. It’s important to note that this doesn’t mean the two projects joined forces. It simply means that the Linux project took some of the GNU software and gave it a good home. This was done with Stallman’s blessing, but there wasn’t any official union between the two groups. Remember that Stallman had intended everyone to freely share
- 55. C HAPT ER 2 ■ A HISTORY AND POLITICS LESS ON 19 and use the GNU tools. Linux represented a set of people doing just that. GNU is still working on its own kernel, called Hurd, which may provide an alternative to using Torvalds’s Linux kernel. ■Note Hurd was first planned back in the 1980s and, at the time of writing, still has yet to see the light of day (although testing versions are available). Hurd is a hugely ambitious project and will set a gold standard when it is released. GNU and Linux together formed a complete operating system, which mimicked the way Unix operated. Other projects and individuals spotted the success of Linux and came onboard, and it wasn’t long before Linux realized the potential for a graphical user interface (GUI), the fundamentals of which were provided by the XFree86 Project. A lot of additional software was also provided by individuals and organizations, all using the same “share and share alike” example set by Stallman, with the GNU tools, and Torvalds, with his kernel. Many people refer to Linux as GNU/Linux. This gives credit to the GNU Project that provided the majority of tools vital to making Linux into a usable operating system. However, like the majority of people in the computing world, we use the term “Linux” throughout this book to avoid confusion. Different Flavors of Linux All the pieces of GNU software were available for free download and were therefore free of charge. But this brought its own problems. Not everyone had the know-how to put all the bits and pieces together into a complete operating system. Those who could do this didn’t necessarily have the time for it. Because of this, a number of companies stepped in to do the hard work. They put together versions of Linux, complete with all the software from the GNU Project, which they then sold for a fee on floppy disks, CDs, or DVDs. They also added in bits of their own software, which made it possible to install Linux easily onto a computer’s hard disk, for example. They produced their own manuals and documentation, too, and did other things such as bug testing to ensure it all worked well. What they came up with became known as distributions of Linux, or distros for short. Examples of these companies include Red Hat, SUSE, Mandrake, and many others around the world. Additionally, a number of enthusiasts got together and formed organizations to create their own distros, such as Debian and Slackware. Modern distros are very advanced. They make it easy to install Linux on your PC, and they usually come with everything you need, so you can get started immediately. Addition- ally, they have their own look and feel, as well as unique ways of working and operating.
- 56. 20 CH APT ER 2 ■ A HI ST O RY AN D PO LI TI CS LESS O N This means that Ubuntu is not the same as Red Hat Linux, for example, although they share a lot of common features and, of course, they all share the core GNU software. Linux Today Nowadays, Linux is a thoroughly modern and capable operating system, considered cutting edge by many. It also runs on many different types of computer hardware, including Apple Macintosh computers, Sun SPARC machines, and the ubiquitous desktop PCs equipped with Intel or AMD processors. One of the ironies is that, although Linux was based on Unix, it has slowly come to dominate the computer operating system market. According to industry sources, Linux is on its way to making commercial varieties of Unix redundant. Companies that sell their own versions of Unix, such as Hewlett Packard and IBM, have added Linux to their traditional product range. Recent innovations in the latest versions of the kernel mean that it finds uses on the smallest computers in the world, as well as on the biggest. Several of the top supercomputers in the world run Linux and, ironically, it can also be used on handheld PDAs or even digital watches! You’ll even find it running things like digital video recorders or other household goods, where it sits invisibly in the background and makes everything work. Remember that one of the fundamental principles of Linux is that you can use it for whatever you want. You don’t need to ask for permission first or tell anyone what you’re doing. Linux initially found mainstream use by software developers, and on server computers, such as those that run the Internet. However, in recent years, it has become increasingly popular on desktop computers. This is the area where experts suggest it will see massive growth over the coming years. Modern Linux Development Nowadays, Linux is developed not only by Torvalds, who manages the huge project, but also by hundreds of volunteers and corporations who contribute resources. Most recently, IBM and Novell have gotten involved and contribute hundreds of people to the effort of creating Linux. Sun contributes the OpenOffice.org office suite and sells its own version of Unix. Corporations like Computer Associates contribute their own software, too. These companies have realized that the best way of producing software is to share and share alike, rather than develop their own proprietary software and keep it secret. The proprietary ways of the 1980s are starting to seem like an ill-conceived flash in the pan. Most recently, Novell found that by embracing Linux, it could massively enhance the functions of its aging NetWare product, without needing to return to the drawing board and start from scratch. It could just take what it wanted from the pile of Linux software. This shows the philosophy of Linux in action.
- 57. C HAPT ER 2 ■ A HISTORY AND POLITICS LESS ON 21 Linux has software for just about every need, ranging from simply receiving e-mail to running a huge e-mail server. There are databases, office suites, web browsers, video games, movie players, audio tools, and more, as well as thousands of pieces of specialized soft- ware used in various niches of industry (and too boring to mention here). Most of this software is available to anyone who wants it, free of charge. What more could you want? Summary This chapter has detailed the history of Linux and explained its origins. It also explained why Linux came into being. We looked at how Linux formed one of the building blocks of a political movement geared toward producing software that can be shared. We discussed the creator of Linux, Linus Torvalds. We’ve also looked at the massive input the GNU Project has made and, in particular, that of its philosopher king, Richard Stallman. In the next chapter, we move on to look at what you can expect from day-to-day use of Linux.
- 59. CHAPTER 3 ■■■ The Realities of Running Linux S o now that you’ve learned about the politics, history, and personalities behind Linux, only one question remains: what’s Linux actually like when used day to day? What should the average user expect from the experience? These are the questions we hope to answer in this brief chapter. Learning to Use Linux What should you expect from Linux once you’ve installed it? Well, it’s a little like running Windows, except there are no viruses, fewer crashes, and no inexplicable slowdowns. In addition, you have complete control over the system. This doesn’t mean Linux is neces- sarily complicated. It’s just that you have the control if you wish to make use of it. We’ll look into this in the later chapters of this book. Most software you use under Windows has at least one equivalent under Ubuntu, installed by default. It’s unlikely that you’ll need to download or install any additional software and, even if you do, you’ll probably find it’s available for free. In most cases, the Linux swap-ins are at least as powerful and easy to use as their Windows alternatives. Tabbed browsing in the Mozilla Firefox web browser lets you visit more than one site at once, for example, without needing to have a lot of browser instances running, as you do with Microsoft Internet Explorer. The Evolution program has a search routine that lets you look through your e-mail messages quickly for a variety of criteria, and it puts the features in a similar Microsoft product to shame. Does this sound too good to be true? There is just one caveat. Linux isn’t a clone of Windows and doesn’t aim to be. It has its own way of doing certain things, and sometimes works differently from Windows. This means that many people experience a learning curve when they first begin using Linux. ■Note Several Linux distributions aim to mimic Windows pretty faithfully. For example, Xandros and Linspire copy the look and feel of Windows to the extent that (allegedly) some people are unable to tell the difference. 23
- 60. 24 CHAPTER 3 ■ THE REALITIES OF RUN NING LINUX But in just a few weeks after your move to Linux, everything will start to seem entirely normal. Most of the time, you won’t even be aware you’re running Linux. Of course, some patience is required during those initial few weeks. Linux can be illogical and frustrating; on the other hand, so can Windows. We simply got used to it. Who Uses Linux? Who uses Linux? The myth from the old days is that it’s only for techies and power users. When you needed to put everything together by hand, this was clearly true. But modern distributions make Linux accessible to all. It’s no exaggeration to say that you could install Linux on a computer Luddite’s PC and have that person use it in preference to Windows. Up until quite recently, Linux was largely seen as a developer’s tool and a server oper- ating system. It was geared toward programmers or was destined for a life running backroom computers, serving data, and making other computer resources available to users. To this end, Linux continues to run a sizable proportion of the computers that make the Internet work, largely because it provides an ideal platform for the Apache web server, as well as various databases and web-based programming languages. This has lead to the LAMP acronym, which stands for Linux, Apache (a web server), MySQL (a database), and PHP, Python, or Perl (three programming languages that can be used in an online environment). Despite its technical origins, recent years have seen a strong push for Linux on desktop computers. Linux has stepped out of the dark backrooms, with the goal of pushing aside Microsoft Windows and Mac OS in order to dominate the corporate workstation and home user market. Running Linux on the desktop has always been possible, but the level of knowledge required was often prohibitively high, putting Linux out of the reach of most ordinary users. It’s only comparatively recently that the companies behind the distributions of Linux have taken a long, hard look at Windows and attempted to mirror its user-friendly approach. In addition, the configuration software in distributions like Ubuntu has progressed in leaps and bounds. Now, it’s no longer necessary to know arcane commands in order to do something as simple as switch the screen resolution. The situation has also been helped by the development of extremely powerful office software, such as OpenOffice.org and Koffice. Is Linux for you? There’s only one way of finding out, and that’s to give it a go. Linux doesn’t require much of you except an open mind and the will to learn new ways of doing things. You shouldn’t see learning to use Linux as a chore. Instead, you should see it as an adventure—a way of finally getting the most from your PC and not having to worry about things going wrong for reasons outside your control. Linux puts you in charge. You’re the mechanic of the car as well as its driver, and you’ll be expected to get your hands dirty every now and then. Unlike Windows, Linux doesn’t hide any of its settings or stop you from doing things for your own protection; everything
- 61. CHAPTER 3 ■ THE REALITIES OF RUN NIN G LIN UX 25 is available to tweak. Using Linux requires commitment and the realization that there are probably going to be problems, and they’re going to need to be overcome. However, using Linux should be enjoyable. In his initial newsgroup posting announcing Linux back in 1992, Linus Torvalds said that he was creating Linux “just for fun.” This is what it should be for you. Getting Hold of Linux Getting hold of Linux is easy. You’ll already have spotted the version of Ubuntu packaged with this book. Ubuntu is the main focus of this book, and we consider it to be one of the very best versions of Linux out there. It’s ideal for both beginners and power users, and it really does match the functionality offered in Windows. It includes several easy-to-use configuration tools, which makes changing your system settings a breeze. For example, a tool known as the Synaptic Package Manager can automate the download and installation of new software with just a few clicks. Ubuntu is also a very good-looking distribution. You’ll find your friends and colleagues “wowing” when they happen to pass by and glance at your PC! Quite a number of Linux distributions are available. If you want to explore other Linux distributions as well as Ubuntu, by far the most fuss-free method of getting hold of Linux is to pop over to your local computer store (or online retailer) and buy a boxed copy. You can choose from Red Hat, SUSE, Mandrake, Libranet, TurboLinux (if you want foreign language support, although nearly all commercial distributions do a good job of supporting mainstream languages), and many others. Many distributions come on more than a single CD—typically up to four CDs at the moment. Some versions of Linux come on DVD. ■Caution Bearing in mind what we’ve said about the sharing nature of Linux, you might think it possible to buy a boxed copy of Linux and run off copies for friends, or even sell them for a profit. However, you shouldn’t assume this is the case. A minority of distribution companies, such as Xandros and Linspire, incor- porate copyrighted corporate logos into their distributions that place restrictions on redistribution. Sometimes they include proprietary software along with the Linux tools, which you cannot copy without prior permission. However, in many cases, reproducing the CDs in small volumes for friends or for use on workstations in a company environment is permitted. Many of the Linux distributions are also available to download free of charge. In fact, many community-run distributions—such as Slackware, Debian, Fedora, and Gentoo— are only available this way (although you can often buy “homemade” CDs from small retailers, who effectively burn the CDs for you and produce makeshift packaging). If your PC has a CD-R/RW drive and you have some CD-burning software under Windows (such as Nero), you can download an ISO image and make your own installation CD from it.
- 62. 26 CHAPTER 3 ■ THE REALITIES OF RUN NING LINUX ■Note An ISO image is a very large file (typically 700MB for a CD or 4.3GB for a DVD), which you can burn to CD or DVD. This CD or DVD is then used to install Linux. Using Ubuntu Ubuntu is a relatively young Linux distribution. It is based on and is still closely allied with the Debian distribution (www.debian.org), like many versions of Linux. Debian has been in existence since 1993—almost as long as the Linux kernel—and embraces the spirit and philosophy of Linux, which says software should be shared and made available to anyone who wants it. Ubuntu takes this one step further. Its goal is to give anyone in the world access to an easy-to-use version of Linux, regardless of geographical location or physical abilities. Ubuntu supports a large number of languages, so it can be used in most countries around the world. In addition, it includes accessibility tools, so it can be used by partially sighted, deaf, or disabled people. From the very start, Mark Shuttleworth, Ubuntu’s creator, decided it would always be free of charge and would always be freely available. Unlike many versions of Linux, no commercial version of Ubuntu exists (although it is possible to pay for various services, such as support, if you wish). But perhaps Ubuntu’s greatest strength is its community, which extends across the world. If you have a question about Ubuntu, you’ll find hundreds of people willing to help. Just as the software is designed to be shared, a strong belief within the Ubuntu community is that knowledge should be shared, too. It might come as no surprise that Ubuntu is an ancient African word that roughly trans- lates as “humanity to others.” In Shuttleworth’s native South Africa in particular, “Ubuntu” is a way of life that advocates acceptance and compassion toward others. The Ubuntu philosophy is one of the underpinnings of post-apartheid South Africa and spreads into political spheres as well as everyday life. The Ubuntu version of Linux is an attempt to bring this spirit to the world of computer software. Ubuntu is primarily geared toward desktop users, although with a little adapting, it can also be used to run server computers. Ubuntu is designed to be easy to use. Anyone who has used Windows or Mac OS will feel right at home. It features every piece of software you could wish for or would find within a well-equipped modern operating system. It includes a web browser, an e-mail client, instant messaging software, an office suite, a graphics editor, and much more. And don’t think that these are cut-down versions designed to lure you into purchasing the full version later on. In every case, they’re full-featured pieces of software that give proprietary programs a run for their money.
- 63. CHAPTER 3 ■ THE REALITIES OF RUN NIN G LIN UX 27 Perhaps more importantly, Ubuntu is very user-friendly. Updating the system can be done with just a few clicks of the mouse, as can downloading and installing new software. Summary This chapter explained what you can realistically expect when using Linux every day. It also discussed the kind of company you’ll be keeping in terms of fellow users. You learned how people usually get hold of Linux. Of course, with this book, you already have a version of Linux, Ubuntu, which was introduced in this chapter. This completes the general overview of the world of Linux. In the next part of the book, you’ll move on to actually installing Linux on your hard disk. This sounds more daunting than it actually is. The next chapter gets you started by explaining a few basic preinstal- lation steps.
- 67. CHAPTER 4 ■■■ Preinstallation Steps T he first part of this book discussed using Linux as part of your day-to-day life. It was intended to help you evaluate Linux and understand what you’re buying into should you decide to make it your operating system of choice. Now we move on to actually installing Linux and, specifically, Ubuntu, which is included with this book on a DVD-ROM. Installing any kind of operating system is a big move and can come as something of a shock to your PC. However, Ubuntu makes this complicated maneuver as easy as it’s possible to be. Its installation routines are very advanced compared to previous versions of Linux, and even compared to other current distributions. What does saying that you’re going to install Ubuntu actually mean? This effectively implies three things: • Somehow, all the files necessary to run Ubuntu are going to be put onto your hard disk. • The PC will be configured so that it knows where to find these files when it first boots up. • The Ubuntu operating system will be set up so that you can use it. However, in order to do all this and get Ubuntu onto your PC, you must undertake some preparatory work, which is the focus of this chapter. Understanding Partitioning Chances are your PC already has Windows installed on it. This won’t present a problem. In most cases, Ubuntu can live happily alongside Windows in what’s called a dual-boot setup, where you can choose at startup which operating system to run. However, installing Ubuntu means that Windows must make certain compromises. Windows is forced to cohabit on your hard disk with another operating system—something it isn’t designed to do. The main issue with such a situation is that Windows needs to shrink and make some space available for Ubuntu (unless you install a second hard disk, which is discussed later 31
- 68. 32 CHAPTER 4 ■ PREINSTALLA TION S TEPS in this chapter). Ubuntu isn’t able to use the same file system as Windows, and it needs its own separately defined part of the disk, which is referred to as a partition. All of this can be handled automatically by the Ubuntu installation routine, but it’s important that you know what happens. All hard disks are split into partitions, which are large chunks of the disk created to hold operating systems (just like a large farm is partitioned into separate fields). A partition is usually multiple gigabytes in size, although it can be smaller. ■Note If you use a Macintosh then don’t feel left out! In the next chapter we include a sidebar explaining the options for installing Ubuntu on your computer. You can view your disk’s partitions using the Disk Management tool in Windows XP, 2000, and Vista, as shown in Figure 4-1. You can access this tool by opening the Control Panel, switching to Classic View, clicking the Administrative Tools icon, selecting Computer Management, selecting Storage, and then choosing Disk Management. Figure 4-1. You can view your disk’s partitions using Windows’s Disk Management tool.
- 69. CHAPTER 4 ■ PREINSTALLA TION S TEPS 33 Most desktop PC systems have just one partition, unless the user has specifically created new partitions. As mentioned, Ubuntu needs a partition of its own. During installation, Ubuntu needs to shrink the main Windows partition and create a fresh partition alongside it (actually, it creates two partitions; the extra one is used to hold the swap file). In addition, the Ubuntu installation routine writes a new boot sector (also known as a boot loader). The boot sector is located at the very beginning of the disk and contains a small program that then runs another program that lets you choose between operating systems (and therefore partitions) when you first boot up. ■Note Not all Linux distributions have the ability to repartition the hard disk. In fact, at the time of writing, it’s pretty rare. Most expect to simply take over the entire hard disk, wiping Windows in the process (although they’ll always ask the user to confirm this beforehand). The ability to repartition a disk is just one of the reasons that Ubuntu is among the best Linux distributions currently available. Of course, Ubuntu cannot shrink a Windows partition that is packed full of data, because no space is available for it to reclaim. UBUNTU AND WINDOWS FILE SYSTEMS One of the benefits of dual-booting Linux and Windows is that Ubuntu lets you access the files on the Windows partition. This is quite handy and facilitates the easy exchange of data. If the Windows partition is FAT32—used on Windows 95, 98, Me, and (sometimes) XP—then Ubuntu can both read and write files to the partition. However, if the file system is NTFS—used with Windows NT, 2000, XP, and Vista—Ubuntu will make the file system available as read-only. Because of this, if you run Windows XP, you might consider converting your NTFS Windows parti- tion to FAT32 before you install Ubuntu (but be aware that doing so means you lose some of the security and performance features of NTFS). Microsoft doesn’t include a tool that lets you do this automatically, but you can use third-party disk partitioning programs like Norton’s Partition Magic (www. powerquest.com) to convert your file system. Freeing Up Space The first step before installing Ubuntu alongside Windows is to check how much free space you have in your Windows partition. To see the amount of free space you have under Windows Vista, click the Start button, click Computer, and look at the bar graph next to your hard disk drive, as shown in Figure 4-2. With older versions of Windows, you
- 70. 34 CHAPTER 4 ■ PREINSTALLA TION S TEPS should double-click My Computer, right-click your boot drive, and select Properties. The free space is usually indicated in purple on a pie chart. In both cases, look for how much free space you have. In Windows Vista, this is the first figure underneath the bar graph. You need to have at least 3GB of free space in your Windows partition for Ubuntu to use. You’ll need more space if you wish to install a lot of programs. If you don’t have enough free space, you have several options: reclaim space, remove Windows, or use a second hard disk. Figure 4-2. Ubuntu needs free disk space in which to install, so you might need to clean up your Windows partition. Reclaiming Space In Windows Vista and XP, you can run the Disk Cleanup tool to free some space on your hard disk. Under Windows Vista, click Start ➤ Computer, and right-click the icon repre- senting your hard disk. Select Properties from the menu that appears, and click the Disk Cleanup button. On Windows XP, click the Disk Cleanup button beneath the pie chart
- 71. CHAPTER 4 ■ PREINSTALLA TION S TEPS 35 showing the free disk space. Disk Cleanup is also accessible by clicking Start ➤ All Programs ➤ Accessories ➤ System Tools ➤ Disk Cleanup. You might also consider turning off System Restore. This consumes a lot of disk space, which you can therefore reclaim. However, deactivating System Restore will mean that you lose the possibility of returning your system to a previous state should anything go wrong. To access the System Restore under Vista, click the Start button, and then right- click Computer in the menu. Select Properties, and click the System Protection link on the left of the window that appears. Next, remove the check alongside the drives under the Available Disk list, confirm that you want to turn off System Restore, and click the OK button on the System Properties dialog box. Under Windows XP, right-click My Computer, click Properties, and then click the System Restore tab. Next, put a check alongside Turn Off System Restore on all Drives, and click OK. If you still cannot free up enough disk space, consider uninstalling unused software via the Add/Remove Programs applet within Control Panel. If you have any large games installed, consider removing them first, because they usually take up substantial amounts of hard disk space. You might also consider deleting movie and MP3 music files, which are renowned for eating up hard disk space. The average MP3 is around 4MB, for example, and one minute of video typically takes up 1MB of disk space! Removing Windows Some users might prefer a second, more radical option: getting rid of Windows completely and letting Ubuntu take over the entire hard disk. If you feel confident that Ubuntu will fulfill your needs, this is undoubtedly the most straightforward solution. You’ll be able to do this during installation. However, this will also mean that any personal data you have will be lost, so you should first back up your data (as described shortly). ■Caution You should be aware that installing Windows back onto a hard disk that has Ubuntu on it is trouble- some. Windows has a Darwinian desire to wipe out the competition. If you attempt to install Windows on an Ubuntu hard disk, it will overwrite Linux. Using Another Hard Disk A third option for making room for Ubuntu is attractive and somewhat safer in terms of avoiding the potential for data loss, but also potentially expensive: fitting a second hard disk to your PC. You can then install Ubuntu on this other hard disk, letting it take up the entire disk. Unlike Windows, Ubuntu doesn’t need to be installed on the primary hard disk and is happy on a secondary drive.
- 72. 36 CHAPTER 4 ■ PREINSTALLA TION S TEPS A second hard disk is perhaps the best solution if you’re low on disk space and want to retain Windows on your system. However, you’ll need to know how to install the new drive or find someone to do it for you (although step-by-step guides can be found on the Web—just search using Google or another search engine). In addition, if your PC is less than 12 months old, there is a possibility that you’ll invalidate your warranty by opening up your PC. If you have an old PC lying around, you might also consider installing Ubuntu on it, at least until you’re sure that you want to run it on your main PC. VIRTUALIZATION If you don’t want to repartition your disk or add another disk drive, there’s another way you can run Ubuntu under Windows: using virtualization software. Put simply, virtualization software lets you run a “computer within a computer” (or, in fact, several computers within a computer!). It does this by cleverly sharing system resources between the real computer and the one that’s being virtualized. When the virtualization software is run, the virtual computer appears in a program window. A BIOS- like startup screen appears, just like on a real computer, and then the virtual hard disk (usually a file on the main hard disk) is booted. An operating system may then be installed onto the virtual hard disk or, alternatively, it’s possible to download entire virtual machines from various sites, for which the hard work of installing the operating system has been done for you! There are a wide variety of virtualization software packages available. Perhaps the most popular are those offered by VMWare, including VMWare Server and VMWare Player. Although proprietary software, both of these two products are entirely free of charge and can be downloaded from www.vmware.com. Another version of VMWare, called Workstation, which is available for a charge, is also highly praised by many. You might investigate Microsoft Virtual PC 2004 too, which is also free of charge and can be downloaded from www.microsoft.com/windows/virtualpc/default.mspx. You can also obtain open-source renditions of virtualization software, such as QEMU (http:// fabrice.bellard.free.fr/qemu), although also worth downloading is QEMU Manager, which provides a GUI-based configuration front end for QEMU: see www.davereyn.co.uk/download.htm. Using a virtualized computer is useful for testing software but, obviously, the experience isn’t seamless. Operating systems running within virtual computers tend to operate more slowly compared to running natively on a computer, and the virtualized hardware is often very simple (you are usually unable to access your computer’s 3D graphics hardware, for example). Setting up a virtual computer can also be difficult for those who are new to it. One final note: virtualization software doesn’t just run on Windows. You can download several virtu- alization software packages for Ubuntu, which means you could install and run Windows within a virtual machine running on Ubuntu! QEMU, mentioned previously, runs on Ubuntu, as does Xen: www. xensource.com/products/downloads.
- 73. CHAPTER 4 ■ PREINSTALLA TION S TEPS 37 Backing Up Your Data Whichever route you decide to take when installing Ubuntu, you should back up the data currently on your computer beforehand. Possibly the easiest way of doing this is to burn the data to CD-R/RW discs using a program like Nero and a CD-R/RW or DVD+-R/RW drive. If you take the coexistence route, installing Ubuntu alongside Windows, backing up your data should be done for insurance purposes. Although the people behind Ubuntu test all their software thoroughly and rely on community reporting of bugs, there’s always the chance that something will go wrong. Repartitioning a hard disk is a major operation and carries with it the potential for data loss. If you intend to erase the hard disk when installing Ubuntu (thereby removing Windows), you can back up your data and then import it into Ubuntu. Table 4-1 shows a list of common personal data file types, their file extensions, where they can be typically found on a Windows system, and notes on importing the data into Ubuntu. Note that earlier versions of Windows (95, 98, and Me) may differ when it comes to data storage locations. Table 4-1. Data That Should Be Backed Up Type of File Typical Typical Notes File Extensions Location (Vista) Location (XP) Office files .doc, .xls, Users<username> Documents and Microsoft Office files can be .ppt, .pdf, Documents Settings opened, edited, and saved etc. <username> under Ubuntu using the My Documents OpenOffice.org suite. PDF doc- uments can be viewed with the Evince program. E-mail files N/A N/A N/A The Evolution mail client used by Ubuntu cannot import data directly from Microsoft Outlook or Outlook Express. However, there is a convoluted but effective workaround, which is described in the next section. Digital .jpg, .bmp, Users<username> Documents and Ubuntu includes a variety of images .tif, .png, DocumentsPictures Settings programs to both view and edit .gif, etc. <username> image files. My Pictures Multimedia .mp3, .mpg, Various within Various within With some additional down- files .avi, .wma, Documents My Documents loads, discussed in Chapter 18, etc. programs under Ubuntu can play MP3 music files and most movie file formats.
- 74. 38 CHAPTER 4 ■ PREINSTALLA TION S TEPS Table 4-1. Data That Should Be Backed Up (Continued) Type of File Typical Typical Notes File Extensions Location (Vista) Location (XP) Internet Ex- None Users<username> Documents Your Favorites list cannot be plorer Favorites and Settings imported into Ubuntu, but the Favorites <username> individual files can be opened Favorites in a text editor in order to view their URLs, which can then be opened in the Ubuntu web browser. Mozilla .html N/A N/A If you use Mozilla Firefox Firefox under Windows, you can man- Bookmarks ually export your bookmarks for import under Firefox when Ubuntu is installed. Click Book- marks ➤ Organize bookmarks, and click File ➤ Export in the window that appears. To import the bookmarks into Ubuntu’s version of Firefox, repeat the steps, but click File ➤ Import instead, and then locate the .html file you saved. Miscellaneous Various Various Various You might also want to back up Internet files web site archives or instant messenger chat logs, although hidden data such as cookies cannot be imported. Backing Up E-Mail Files Microsoft e-mail cannot be easily imported into Ubuntu. Most e-mail programs use the MBOX format, and this is true of Ubuntu as well as programs created by the Mozilla Foun- dation (the organization behind the Firefox web browser). However, Microsoft uses its own DBX file format for Outlook Express and PST format for Outlook. As a workaround, you can download and install the free Mozilla Thunderbird e-mail client (available from www.mozilla.com/en-US/thunderbird) on your Windows system. In Thunderbird, select Tools ➤ Import to import your messages from Outlook, Outlook Express, or even the popular Eudora mail client. You will then be able to back up Thunder- bird’s mail files and import them into Evolution under Ubuntu, as described in Chapter 27. To find where the mail files are stored, in Thunderbird, select Tools ➤ Account Settings, and then look in the Local Directory box. Back up each file that corresponds to a folder within your mail program (for example, Inbox, Sent, and so on). Note that you only
- 75. CHAPTER 4 ■ PREINSTALLA TION S TEPS 39 need to back up the files without file extensions. You can ignore the .sdb folders as well as the .msf files. ■Tip To quickly go to the location of the Thunderbird e-mail files under Windows, copy the address in the Local Directory text box. Then, under Windows XP, click Start ➤ Run, paste the address straight into the Open box, and click OK. Under Windows Vista, paste the address into the Start Search text box, and press Enter. Making Notes When you’re backing up data, a pencil and paper come in handy, too. You should write down any important usernames and passwords, such as those for your e-mail account and other online services. You might want to write down the phone number of your dial-up connection, for example, or your DSL/cable modem technical settings. Figure 4-3 shows an example of some information you might want to record. In addition, don’t forget to jot down essential technical details, such as your IP address if you are part of a network of computers using static addresses (this will usually be relevant only if you work in an office environment). ■Tip If you’ve forgotten any passwords, several freeware/shareware applications are able to “decode” the asterisks that obscure Windows passwords and show what’s beneath them. A good example is Asterisk Password Reveal, which you can download from www.paqtool.com/product/pass/pass_001.htm. Shareware sites like www.download.com offer similar applications. Note that you don’t need to write down information such as hardware interrupt (IRQ) or memory addresses, because hardware is configured automatically by Ubuntu. However, it might be worth making a note of the make and model of some items of internal hardware, such as your graphics card, modem (dial-up, DSL, or cable), and sound card. This will help if Ubuntu is unable to automatically detect your hardware, although such a situation is fairly unlikely to arise. Under Windows Vista, you can find out this information by clicking the Start button and right-clicking Computer. Click Properties in the menu that appears, and click the Device Manager link on the left of the window that appears. Under Windows XP, right-click My Computer on the desktop (or on your Start menu), select Properties, and click the Hardware tab. Then click the Device Manager button. Instead of writing everything down, you might consider taking a screenshot by pressing the Print Scr button and using your favorite image editor to print it.
- 76. 40 CHAPTER 4 ■ PREINSTALLA TION S TEPS Figure 4-3. Don’t forget to back up “hidden” data, such as ISP dial-up phone numbers. ■Tip Ubuntu works with a wide variety of hardware, and in most cases, it will automatically detect your system components. If you’re in any doubt, you can consult the forums at http://ubuntuforums.org, in particular, the Hardware Help forums under the Main Support Categories heading. You might also consider subscribing to one or more of the Ubuntu mailing lists at https://lists.ubuntu.com. Remember that an important element of Ubuntu is its community of users, many of whom will be very willing to answer any questions you might have! Once you’re certain that all your data is backed up, you can move on to the next chapter, which provides a step-by-step guide to installing the operating system.
- 77. CHAPTER 4 ■ PREINSTALLA TION S TEPS 41 Summary The aim of this chapter has been to prepare both you and your computer for the installation of Ubuntu. We’ve looked at how your hard disk will be partitioned prior to installation and the preparations you should make to ensure your hard disk has sufficient free space. You also learned about the types of files you might choose to back up, in addition to vital details you should record, such as usernames and passwords for your online accounts. In the next chapter, we move on to a full description of the Ubuntu installation procedure. The chapter guides you through getting Ubuntu onto your computer.
- 79. CHAPTER 5 ■■■ Installing Ubuntu I t’s now time to install Ubuntu. This is a surprisingly quick task and shouldn’t take more than 30 minutes on a modern PC. It’s also relatively simple, with very few decisions to make throughout. Ubuntu’s installation program automates the task to a high degree. However, you should examine all the options you’re offered to make sure they’re correct. Installing an operating system involves a couple of serious maneuvers that, via an incor- rect click of the mouse or accidental keystroke, bring with them the possibility of data loss. Read and consider every warning message you see, and be sure to keep your wits about you. Above all, make a backup of your data, as described in the previous chapter. An Overview of the Installation Process The DVD-ROM disc supplied with this book is double-sided. This means it’s like a vinyl LP record. To play Side A, simply insert the disc with the Side A label topmost. To play Side B, insert the disc with the Side B label topmost. Side A contains the complete DVD-ROM release of Ubuntu 8.04, code-named Hardy Heron. This is the most recent version of Ubuntu at the time of writing and contains most of the officially supported software released by the Ubuntu project. Side B contains the following: • An ISO image file of the CD release of Ubuntu 8.04, which you can burn to a blank CD-R/RW disc by following the instructions in Appendix D. This is included in case you wish to give copies of Ubuntu to your friends, or if you wish to try the Wubi Windows installer (see the “Install Ubuntu Inside Windows” sidebar), which isn’t included with the DVD version of Ubuntu 8.04 for technical reasons. ■Note You can also freely duplicate the DVD supplied with this book and give copies to friends if you wish. In fact, this is encouraged. 43
- 80. 44 CHAPTER 5 ■ INSTALLING UBU NTU • The 8.04 (Hardy Heron) releases of Kubuntu, Xubuntu, and Edubuntu, which provide alternate desktop environments should Ubuntu’s default desktop environ- ment, GNOME, not suit your taste. For more details on these versions of Ubuntu, see Appendix D. • A version of Ubuntu for PowerPC-based computer users, such as those with an older G3-, G4-, or G5-based Macintosh computer. You should bear in mind that this version of Ubuntu is community-supported. This means there isn’t a 100% guarantee of updates or security fixes in the future, as with the officially supported releases. This is discussed in more detail in Appendix D. If you want to use any of these installers on Side B of the DVD, you will first need to burn it onto a CD. This procedure is discussed in Appendix D. However, most readers will want to install the full version of Ubuntu. So to start things rolling, insert Side A of the DVD-ROM drive and boot your computer. You might have to set your BIOS to boot from DVD, as explained in stage 2 of the installation guide in this chapter. If you’ve ever installed Windows from scratch on a computer, you might be used to working with the Windows installation program. This appears when you boot from a Windows CD or DVD or run the setup.exe program from the desktop, and it guides you through installing Windows onto your hard disk. Ubuntu is a little different. Once you’ve booted from the DVD-ROM, a menu will appear. You can choose the Install Ubuntu option, and the DVD will continue booting to a graphical installer. Alternatively, you can choose the Try Ubuntu Without Any Change to Your Computer option. This allows you to run Ubuntu from the DVD-ROM, effectively trying it out without making any changes to your computer. Using Ubuntu without installing it to the hard disk is known as running in live distro mode. Although this is a great way to take a sneak peak at what Ubuntu offers, there are a handful of practical drawbacks, as discussed in the sidebar titled “Running in Live Distro Mode.” To install Ubuntu on your computer, simply select the Install Ubuntu option from the boot menu. This will run the dedicated installation program, which will work through a few stages to get Linux on your computer’s hard disk. During the installation stages, you’ll be asked a handful of essential questions. You’ll then be prompted to repartition your hard disk in order to create space for Ubuntu. After this, Ubuntu is installed onto your hard disk. At the end of the procedure, your PC will boot straight into the Ubuntu login screen, and you’re set to go. There’s no need to mess around configuring hardware, because that’s done automatically. Neat, eh?
- 81. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 45 In most cases, the installation process will run smoothly without a hitch. But if you do run into problems, head over to Chapter 6, which addresses many of the most common issues and provides solutions. RUNNING IN LIVE DISTRO MODE If you don’t want to install Ubuntu just yet, you can try it out by booting the operating system straight from the DVD supplied with this book. To do this, simply insert the DVD-ROM, and then reboot your computer. Make sure the computer is set to boot from DVD (see stage 2 of the installation guide in this chapter to learn how), and select the Try Ubuntu Without Any Change to Your Computer option. After a few moments, the Ubuntu desktop will appear. You can follow most of the chapters in this book when running in live distro mode. However, there a number of issues you should be aware of: • Settings: Any changes you make to the system will be forgotten as soon as you shut down your PC or reboot. In other words, each time you run in live distro mode, it will be as if Ubuntu has been freshly installed. For example, if you’ve configured a network card or rearranged the desktop, those changes will be lost. There are ways around losing settings on each reboot, but they involve parti- tioning your hard disk, which, frankly, is as much effort as installing Ubuntu from scratch. So there’s little to be gained by doing so. • Performance: Because the data must be read from DVD-ROM, running Ubuntu in live distro mode is a slow and, therefore, frustrating experience. It can also be noisy if your DVD-ROM is a model that makes a whirring noise as it spins. • System: As strange as it sounds, Ubuntu is largely unaware of when it’s running in live distro mode. For example, if you were to follow the instructions in Chapter 9, which discuss how to update your system, Ubuntu will attempt to update, even though it’s running in live distro mode! Of course, it can’t do this, because, as far as it is concerned, the DVD-ROM is the hard disk, and it’s therefore impossible to write data to it. This can create confusing error messages. • Root: When running in live distro mode, you’re automatically given root-user powers. We explain the significance of this in Chapter 7, but for the moment, it’s enough to know that the root user has unlimited power over the system. This means that you could repartition the hard disk, for example, or even wipe the hard disk entirely, all without any password prompt or warning. This can be useful in certain circumstances—you can attempt to “rescue” a hard disk that’s having problems using the live distro mode of the Ubuntu disc. But using it for everyday tasks is a huge risk, and the potential for accidental damage is high. In short, we would recommend that you use live distro mode sparingly and only to get a taste of what Ubuntu is like. If you intend to use Ubuntu for any significant period of time, you should install it to your hard disk.
- 82. 46 CHAPTER 5 ■ INSTALLING UBU NTU Step-by-Step Guide As outlined in Chapter 4, you shouldn’t start the installation process until you’ve made sure there is enough space for Ubuntu on your hard disk and you have backed up all the data. With those preparations complete, you’re ready to install Ubuntu. The remainder of this chapter guides you through the process. Stage 1: Prepare the Windows Partition for Resizing If you’re installing Ubuntu on a computer that already contains Windows, it’s a good idea to perform three additional steps before actually installing Ubuntu. These steps will ensure Ubuntu will be able to resize the Windows partition successfully. If your computer doesn’t contain Windows, or if you’re installing Ubuntu onto a second hard disk, then you can skip straight to stage 2. The following are the steps for preparing the Windows partition for resizing: 1. Scan the disk for errors. 2. Defragment the hard disk. 3. Ensure Windows is shut down correctly. To scan the disk, open My Computer (or Computer if you’re running Windows Vista), right-click your Windows drive (usually C:), and select Properties. In the window that appears, click the Tools tab, and then click the Check Now button under the Error Checking heading. Ensure there’s a check alongside Automatically Fix File System Errors, as shown in Figure 5-1, and click the Start button. You will then be prompted to schedule the disk check the next time your computer restarts. Select to do so, and reboot your computer, so the disk check can take place. When the computer has rebooted, repeat the previous steps to view the Tools tab of the drive’s Properties dialog box, and click the Defragment Now button. Then work through the defragmentation program’s options in order to defragment the Windows disk (usually this involves simply clicking the Defragment button (labeled Defragment Now under Windows Vista). Once that has completed—it may take several hours if your computer has not been defragmented before—shut down the computer as usual, and proceed to stage 2 of the installation process. It’s vital that the computer shuts itself down properly. If the computer doesn’t cleanly shut down, Ubuntu’s installation program might stop with an error message about not being able to resize the partition.
- 83. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 47 Figure 5-1. Before installing Ubuntu, it’s essential to scan the Windows partition for errors and to defragment it. INSTALLING UBUNTU INSIDE WINDOWS Version 8.04 of Ubuntu includes a clever piece of software called Wubi that lets you install Ubuntu within the Windows file system. In other words, there is no need to repartition your hard disk. Aside from this, there is no major difference between a partitioned installation and a Wubi installation. Wubi works by creating a loopback file system; that is, it creates a single large file within the Windows file system, and that file is then used as the Ubuntu file system. Wubi is a nice way to try out Ubuntu on a more permanent basis than using the live distro mode. The biggest issue is that Wubi requires at least 256MB of memory and 5GB of hard disk space, although this shouldn’t present any problems for relatively modern computers. However, users have reported performance degradation compared to a dedicated Ubuntu installation in its own partition, and you’ll also find that Ubuntu’s useful Hibernate power-saving mode (what Windows refers to as Suspend to Disk) isn’t supported. Unfortunately, Wubi isn’t included on the DVD release of Ubuntu, as supplied on Side A of the DVD- ROM disc that comes with this book. To use it, you’ll need to burn your own CD-R/RW disc from the installation ISO image of Ubuntu provided on Side B of the disc. To learn how to do this, follow the instructions in Appendix D.
- 84. 48 CHAPTER 5 ■ INSTALLING UBU NTU To use Wubi, insert the CD while Windows is up and running. In the dialog box that appears, click the Install Inside Windows button. If the dialog box doesn’t appear, navigate to the contents of the CD and double-click wubi.exe. In the next dialog box, you are presented with a series of drop-down lists. Using these, you can choose on which drive to create the Ubuntu file system, if you have more than one hard disk or partition, and you can choose the size of the loopback file system you want to create. In most cases, the default options are fine. You will need to enter a username and password in the boxes provided. These will form your Ubuntu login details. When you’re finished, click the Next button. Wubi will then create the loopback file system. When it has finished, you’ll be invited to reboot your computer. After the computer is up and running again, you’ll be presented with a boot menu from which you can choose either Windows or Ubuntu. Choosing Ubuntu will then start the installation routine, which will complete automatically. Following this, you’ll be prompted to reboot. From then on, selecting the Ubuntu option from the boot menu will start Ubuntu. To start Windows, simply choose the Windows option from the menu. To remove the Ubuntu file system from your Windows hard disk, navigate to C:ubuntu from within Windows and double-click Uninstall-Ubuntu.exe. Don’t be tempted to just delete the ubuntu folder, because doing so will not remove the boot menu component. Stage 2: Boot from the DVD-ROM With your computer booted up, insert the Ubuntu disc into the DVD-ROM drive, with Side A topmost. Close the tray, and reboot your computer. The disc might automatically run under Windows, opening a menu where you can click to find out more about Ubuntu, but you can ignore this. Because you need to boot from the DVD-ROM disc in order to run the Ubuntu installer, the first step is to make sure your computer’s BIOS is set correctly. Many modern computers let you press a particular key during the initial boot phase of your computer, during the memory testing and drive identification period, to make a boot menu appear. On the boot menu, you can choose to boot from the CD or DVD drive from the list. On our test PC and notebook computer, hitting the Esc key causes this menu to appear, but your computer may be different. Your computer’s boot screen should indi- cate which key to press. If you do not have an option to boot from the CD/DVD drive, you’ll need to enter the BIOS setup program and change the boot priority of your computer. To do this, press the Delete key just after the computer is first activated. Again, some computers use another key or key combination, and your boot screen should indicate which key to press.
- 85. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 49 When the BIOS menu appears, look for a menu option such as Boot and select it (you can usually navigate around the screen of the BIOS menu using the cursor keys and select options by pressing Enter). On the new menu, look for a separate entry such as Boot Device Priority or perhaps Boot Sequence. Make sure that the entry for the CD/DVD-ROM is at the top of the list, as shown in the example in Figure 5-2. Arrange the list so that CD/ DVD-ROM is followed by the floppy drive and then your main hard disk. You can usually press the F1 key for help on how the menu selection system works. Figure 5-2. Before starting, make sure your computer can boot from the DVD-ROM. Once you’ve made the changes, be sure to select the Save and Exit option. Your PC will then reset and boot from the Ubuntu DVD-ROM, and you’ll be greeted by the Ubuntu DVD boot menu. ■Note After Ubuntu has been installed on your computer, you might choose to repeat this step and rearrange the boot order once more to make the hard disk appear at the top of the list. Then your computer won’t waste time checking the DVD-ROM drive for a boot disc every time it starts.
- 86. 50 CHAPTER 5 ■ INSTALLING UBU NTU Stage 3: Choose Language Settings Once the Ubuntu disc has booted, but prior to the Ubuntu boot menu appearing, you’ll be prompted to choose the language in which you want the boot menu to appear. Use the cursor keys to make your choice, as shown in Figure 5-3, and then press Enter. Figure 5-3. Choose the language you wish to use for the boot menu and hit Enter to select it. Stage 4: Select from the Boot Menu When the DVD-ROM boot menu appears, you’ll be offered a number of options, as shown in Figure 5-4. You can move between the menu options using the up and down arrow keys. Hit the Enter key to select an option.
- 87. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 51 Figure 5-4. Select Install Ubuntu and press Enter. The options are as follows: Try Ubuntu without any change to your computer: This option lets you run Ubuntu from the DVD-ROM disc, so you can try out its features, albeit in a slightly limited state (see the “Running in Live Distro Mode” sidebar). Install Ubuntu: This will start Ubuntu’s installation routine and is the option you should choose. Install Ubuntu in text mode: This will start an older installation routine that runs solely in text mode, without any graphics. This can be useful if your computer has problems running the graphical installer that appears when you select the Install Ubuntu option. Check CD for defects: This will check the DVD, even though it says “Check CD,” and make sure that the DVD contents are correct. A defective or damaged DVD will cause errors at some point during the installation process. Once the DVD has been validated, you can press any key to reboot. Note that you don’t need to use this option unless you run into problems during installation and are trying to locate the cause.
- 88. 52 CHAPTER 5 ■ INSTALLING UBU NTU Test memory: This will start a simple but thorough memory-testing program called Memtest86. This is useful if you think your computer’s memory might have a fault that will prevent you from installing Ubuntu. For more details about how to use Memtest86, see www.memtest86.com. To quit Memtest86 and reboot your computer, press Esc. Boot from first hard disk: This will cause the computer to boot from the default hard disk, thereby bypassing Ubuntu. If your computer has Windows installed on it, this will start Windows. Stage 5: Choose a Language for Ubuntu After some time, the Ubuntu installation program will start, as shown in Figure 5-5. From the list on the left, choose the language you wish to use when Ubuntu is up and running on your computer (not just during the installation), and then click the Forward button. Figure 5-5. Select the language you want to be the default when Ubuntu is installed, and then click the Forward button.
- 89. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 53 Stage 6: Select Your Country and Time Zone Ubuntu will next ask you to choose your time zone. Choices include American time zones, such as Eastern Standard Time (EST), and European time zones, such as Greenwich Mean Time (GMT). The selection can be made either by clicking your location on the world map that’s displayed or by selecting the nearest city from the Selected City drop-down list. When you click the map, you should find that it zooms in; clicking anywhere within the mainland United States, for example, should enlarge the continent, allowing for more accurate selection. See Figure 5-6 for an example. Figure 5-6. When you click the time zone map, you should find it zooms in and allows for easier selection of the city nearest to your location. Regardless of where you live, you should see dots on the map representing major cities in your locality. Click the one closest to you that’s in the same time zone. In some cases, the choice is limited—those in the UK can click only London, for example.
- 90. 54 CHAPTER 5 ■ INSTALLING UBU NTU ■Note Actually, if you look closely at the time zone selection screen, you’ll see that, in addition to London, you can also click the Isle of Man, a small island off the northwest coast of England. Why is such attention paid to this location? Well, it so happens that this is where the registered offices of Canonical, the company behind Ubuntu, are located! The city you choose doesn’t matter a great deal—the purpose of this step is to ensure Ubuntu selects the correct time zone for your location, which it does by looking up the city in a database of time zones. When you’ve made your selection, click the Forward button. Stage 7: Confirm Your Keyboard Layout Next, you’ll be asked to confirm the keyboard layout you’ll be using, as shown in Figure 5-7. This should correspond to your language and locale settings, and will be automatically selected, so you can just click the Forward button. If you’re unsure whether Ubuntu has guessed the correct keyboard layout, you can click the test text field and type in some characters before continuing. ■Note Keyboard layouts can differ from country to country even if they speak the same language. This is to allow for local necessities. The UK keyboard layout has the pound sterling symbol (£) above the number 3, for example, and swaps around the locations of a handful of other symbols, too.
- 91. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 55 Figure 5-7. Ubuntu will guess your keyboard layout, but you can test it to make sure by typing in the test text field at the bottom of the dialog box. Stage 8: Repartition Your Hard Disk Partitioning the disk is one of the most important steps during installation, although, unfortunately, it’s one that can be couched in difficult terminology. Ubuntu does its best to make partitioning easy. The Ubuntu installation routine offers four options for disk partitioning: • Resize the existing partition on the hard disk and install Ubuntu alongside it in the newly created free space. • Use the entire disk, whether it already has some contents or not (that is, if the computer or hard disk is new or if you want to overwrite your Windows installation).
- 92. 56 CHAPTER 5 ■ INSTALLING UBU NTU • Use the largest free space that might already exist on the hard disk (perhaps if you’ve already manually repartitioned the disk). • Manually edit the partition table; that is, resize/delete any existing partitions by hand and create the Ubuntu partitions. Most people who are installing Ubuntu on a computer that already has Windows on it will want to resize the main partition, as described next. If you’re installing Ubuntu on a computer that has no operating system installed or one that you would like to completely erase from the computer, follow the instructions under “Use Entire Disk.” Resize the Main Partition This is the default partitioning option if your computer already has Windows installed on it. Ubuntu will detect the main Windows partition and suggest the amount of resizing. ■Caution If there’s not enough free space within the Windows partition, you won’t be able to resize it to make space for Ubuntu. If this is the case, the Ubuntu installer will tell you. See Chapter 4 for suggestions for freeing up space. By default, Ubuntu attempts to grab as much space for itself as possible, without shrinking the existing partition too much. In our example in Figure 5-8, the installation program has decided that 71% of the entire disk space should be devoted to Ubuntu, shrinking the Windows partition so that it takes up 28% of the space. This is shown in the bar display: the left part of the bar represents Windows, and the right part represents the new Ubuntu partition. Ubuntu’s default choice is normally fine, but you can also click and drag the grab bar in the middle of the partitioning display bar to increase or decrease the sizes of the Windows and Ubuntu partitions. You may want to give Windows a little more space if you plan to divide your time between Windows and Ubuntu. The Ubuntu installer is intelligent enough not to let you set an impossible value for shrinking the existing partition. The Ubuntu installer is also clever enough to know that Windows needs some free space within its partition to operate effectively—to write temporary and system files and user-created files such as Word documents, for example. So you shouldn’t be able to make changes that are too extreme. On a test system, we couldn’t set a size for the existing partition lower than 10% of the entire disk, because the existing data on the partition occupied around 10% of the space. You can override this protection by manually partitioning, as described under “Manually Edit the Partitioning Table.” Similarly, the installer shouldn’t let you create an inadequate amount of free space for Ubuntu when dragging the slider to the right.
- 93. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 57 Figure 5-8. The installer will take as much space as Ubuntu needs, without shrinking the existing partition too much. Once you’ve made your selection, click the Forward button. The installer will resize the partition, which might take a few moments. ■Caution If you’re resizing a partition on a notebook computer, ensure that you have the main power connected. If the power goes off during the resizing procedure because of a failing battery, there’s a very good chance your Windows partition will be destroyed. Use Entire Disk If the hard disk is empty, or if you’ve decided to eradicate Windows and use only Ubuntu on your computer, you can choose the Guided – Use Entire Disk option. If the disk does have contents, this option will remove them and then use the entire disk to install Ubuntu. As mentioned in Chapter 4, before undertaking this move, you should back up essential data on the Windows partition (or any others on the hard disk). There is no way of undoing the partition erasure, so you should proceed with caution. Once you’ve made the choice, click the Forward button. The deletion should take place quickly, after which you can proceed straight to the next stage in this guide.
- 94. 58 CHAPTER 5 ■ INSTALLING UBU NTU Use the Largest Contiguous Free Space If you’ve already repartitioned your hard disk using a third-party utility, or if you deliber- ately created a smaller Windows partition in order to leave free space for another operating system, you can select the Guided – Use the Largest Continuous Free Space option (note that this option won’t appear unless there is free space on the hard disk). Then the Ubuntu installation program will use the largest amount of free space for the Ubuntu partitions. This is an important point: if you have more than one area of free space, the largest will be used. If you do have more than one amount of free space, the Ubuntu installation routine is unable to automatically use any smaller amounts of free space. If you wish this to be the case, the only option is to manually partition, as described under “Manually Edit the Partitioning Table.” However, only advanced users will need to do this. When you’ve made your choice, click the Forward button, and proceed to the next stage in this guide. Use a Second Hard Disk If your computer has more than one hard disk—a new hard disk you’ve added for Ubuntu, as described in Chapter 4, or a second hard disk already installed in your computer—you should select it under the Guided – Use Entire Disk option, as shown in Figure 5-9. The way Ubuntu identifies your hard disks might seem a little complicated at first, but is actu- ally straightforward. Figure 5-9. If there’s more than one hard disk installed, and you want to install Ubuntu to use the second one, select it under Guided – Use Entire Disk.
- 95. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 59 If your computer is relatively new, chances are it has a SATA-based hard disk. If so, the first hard disk will be identified as sda, the second as sdb, the third as sdc, and so on. All that changes in each case is the last letter: a, b, c, and so on. If your computer uses IDE-based hard disks, the drives will also be identified as sda, sdb, and so on. The primary master drive in the system is identified as sda, the primary slave as sdb, the secondary master as sdc, and so on. The drive will also be identified by make and model, which may help you identify it. Assuming the second hard disk is installed as a slave on the primary channel, as is the standard configuration for an additional hard disk, it will be identified as sdb, so make that selection. If the disk is installed as the slave on the secondary channel (that is, the same channel as the DVD-ROM drive), it will be identified as sdd. After you’ve selected the disk, click the Forward button. Manually Edit the Partition Table If, for any reason, you find that Ubuntu’s default partitioning choices are not for you, you can opt to manually edit the partition table. There are essentially two stages to work through if you choose this option: • You’re given the chance to repartition the disk manually. You can resize or delete any existing partitions and create the partitions Ubuntu needs. • While creating/editing the partitions, you’ll be asked to assign mount points. You’ll be prompted to tell Ubuntu which of the partitions on the disk it should use for the root file system (that is, the main partition for Ubuntu’s use) and which should be used for the swap partition. Manually partitioning offers ultimate flexibility but requires a relatively high level of knowledge of how Ubuntu works. Therefore, we recommend that only experts undertake this step, unless you have no other choice because the default Ubuntu partitioning choices do not offer what you need or do not work properly for you. In the following steps, we explain how to resize an existing partition, create the new partitions that Ubuntu needs, and assign mount points so that Ubuntu is able to use them. ■Tip GParted is a graphical partition tool that you can use to add, edit, and delete partitions easily. GParted looks similar to the third-party commercial partition tools you may have already used. You can run this utility by starting Ubuntu in live distro mode and selecting System ➤ Partition Editor from the menu. Once you have made the desired changes with this partition editor, you can reboot and start the Ubuntu installer again. Then when you manually edit the partitions in the installer, you need to set mount points only on the partitions that you created in GParted.
- 96. 60 CHAPTER 5 ■ INSTALLING UBU NTU Prepare Partitions When the disk partitioning choices appear, click the Manual radio button and click Forward. The Prepare Partitions window will appear. This window lists the hard disks detected by Ubuntu and their corresponding partitions. Each item has the following properties: • Device: This is the logical representation of the hardware device in Ubuntu. See the previous section for an explanation of the drive identification, but note that here the drive references are preceded with /dev. You can ignore this. The numbers at the end refer to the order of partitions. For example, sda1 refers to the first partition of the first hard disk, and sda2 refers to the second partition of the first hard disk. • Type: This specifies the file system type of the partition. For example, NTFS and VFAT are Windows file systems, ext3 indicates the Ubuntu partition, and swap indi- cates a swap file partition. • Mount point: The mount point is how Ubuntu will see the partition once it is up and running. At least one partition needs to be mounted as root. Mounting is discussed further in Chapter 14. • Format?: This indicates whether the partition will be formatted during installation. • Size: This determines the disk space of the partition, in megabytes. Note that the strict definition of the word megabyte is used, meaning 1,000,000 bytes, rather than the more commonly understood 1,024,000 bytes (1,024KB). To confuse matters, the 1,024KB definition is used in the rest of the installation program. • Used: This determines how much disk space has been consumed, in megabytes. At the bottom of the window are buttons to manipulate the hard disk as a whole or each individual partition. For the hard disk, you can opt to create a new partition table. This effectively returns the disk to as-new status, with no partition information, so creating a new partition table is tantamount to erasing the whole hard disk. Be sure you know what you’re doing! For unallocated free space, you have an option to create a new partition. For an existing partition, you have an option to edit its properties (this option lets you resize the disk and assign a mount point) or delete the partition to accumulate free disk space. You also have an option to undo all hard disk changes, which applies to all desired changes except resizing a partition, because resizing is carried out as soon as you select to do so, unlike the other changes, which are carried out after working through all the installation stages. You want to resize the main NTFS (Windows) partition. Search for that partition in the partition type list; it will be shown as ntfs.
- 97. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 61 Determine Windows Partition Size Once you have found the NTFS partition, you should determine how much space should be retained in your Windows partition so that Windows will still function properly while providing a sufficient amount of space for Ubuntu. At the bare minimum, your Windows partition should have 2GB of available disk space for new applications, software upgrades, and your data. You should free up as much space as possible for Ubuntu. But if disk space is a concern, you will need to determine the minimum of disk space that should be put aside for the main and swap partitions of Ubuntu. The main partition will contain the Ubuntu operating system itself. The main partition should have at least 3GB of disk space (2GB for the base installation and the rest for new applications, software upgrades, and your data). The swap partition is similar to the swap file under Windows (sometimes referred to as virtual memory or the paging file), except that it resides on its own partition. The swap partition acts as additional memory should the main memory become full. Because accessing the hard disk takes longer than accessing the RAM, using the swap partition is undesirable and is a last resort. However, all operating systems need this partition just in case. Additionally, the swap file is used when the computer enters Hibernate (Suspend to Disk) power-saving mode. The size of the swap partition depends on the size of your physical RAM. See Table 5-1 for some suggestion. However, if you want to use the Hibernate feature on your computer, your swap partition size should be at least equal to the size of the physical RAM. Table 5-1. Suggested Swap Partition Sizes for a Desktop Ubuntu System Physical RAM Size Swap Partition Sizea 512MB 1024MB 1024MB (1GB) 1025MB 2048MB (2GB) 2049MB 3072MB (3GB) 3073MB 4096MB (4GB) 4097MB a Swap partition sizes have been adjusted to take into account the strict definition that 1 megabyte = 1,000,000 bytes, as stated in the Create Partition dialog box. Once you have determined the size of your main and swap partitions, total their sizes. This is how much free space you need to allocate for Ubuntu.
- 98. 62 CHAPTER 5 ■ INSTALLING UBU NTU Edit Partition Properties In the Prepare Partitions window, select the NTFS partition and click Edit to change its properties. In the Edit Partition dialog box, shown in Figure 5-10, you can edit three parti- tion properties: • New partition size in megabytes: This allows you to adjust the size of the selected partition. If you reduce the size of the selected partition, the remaining space will be allocated for free space. For example, if you have an NTFS partition with a size of 104,847MB and you would like to allocate 4,096MB for Ubuntu, you would need to reduce the size of the NTFS partition to 100,751MB. Adjust the size of the NTFS partition as you determined in the previous step. • Use as: This either changes or displays the file system of the selected partition. The current file system is NTFS, because you are editing a Windows partition, so select ntfs from the list if it isn’t already displayed. Be careful not to select any of the other entries from the list, because this could damage your Windows setup irreversibly. • Mount point: Ubuntu makes non-Linux file systems (such as Windows) available by mounting them. Mounting is explained in Chapter 14, but for now, it’s enough to know that Ubuntu creates a “fake” directory through which the contents of the partition can be accessed. You can either select one of the default suggestions (on our test system, these were /dos and /windows) or type your own path (but only if you know what you’re doing). Figure 5-10. Enter the new size of the partition in the New Partition Size text box.
- 99. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 63 Once you are satisfied with your choices, click the OK button. At this point, you are prompted to confirm that your desired changes will be made to the disk, as shown in Figure 5-11. Double-check your settings, because your confirmation will make the disk changes permanent. Click Continue when you’re ready to start the resizing process. After the process is finished, you will have free space to allocate for Ubuntu. Figure 5-11. Ubuntu prompts you to confirm your choice of resizing the partition because the disk changes will be made permanent. If you see an error message while trying to resize the partition, it’s likely that Windows was not shut down correctly. To fix this situation, exit the Ubuntu installer, reboot Windows, and opt to check the disk. Then reboot so the check can take place. After that, reboot again, ensuring Windows is properly shut down. Then you can return to the Ubuntu installer. Create Main and Swap Partitions The next step is to create partitions with the free space. Select the new free space you have created and click the New Partition button. The Create Partition dialog box will appear, as shown in Figure 5-12. This dialog box has five options:
- 100. 64 CHAPTER 5 ■ INSTALLING UBU NTU • Type of new partition: This option allows you to set the partition as primary or logical. Unless the hard disk has more than one operating system installed, you should select the Primary option. With primary partitions, you can divide your hard disk up to only four partitions. If you need more than four partitions, or if there are already three partitions on the disk, select the Logical option. • New partition size in megabytes: This option sets the number of megabytes that will be allocated to the new partition. The default value takes all of the free space. • Location for the new partition: This option specifies if the new partition will be created on the beginning or end area of the free space. It’s recommended that you use the beginning. This way, the free space can be seen easily, since it always appears just below all of the partitions. • Use as: This option specifies the file system of the new partition. The default option of Ext3 Journaling File System is fine when you are creating the main partition. • Mount point: The mount point is a directory that will act as a location where you can make a disk accessible. The main partition you create for Ubuntu must be mounted as root. This is always represented as a single forward slash (/). Figure 5-12. You can create a new partition as long as there is free/unallocated space available. Start by creating the swap partition. You’ve already determined the size of this parti- tion in a previous step. Enter the desired partition size and change the Use As option to Swap Area. Leave the rest of the options untouched (note that the swap partition doesn’t need a mount point). For example, if the size of the physical RAM is 1GB, the partition size for the swap partition should be set to 1025MB, as shown in Figure 5-13. Click OK to continue.
- 101. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 65 Figure 5-13. The size of your swap partition depends on the amount of physical RAM in your computer. Next, create the main partition. Select the free space and click the New Partition button to open the Create Partition dialog box again. For the Mount Point option, select the forward slash (/) to specify that this partition is the main partition or root file system. Your dialog box should look similar to the one shown in Figure 5-14. Click the OK button to continue. Figure 5-14. The main partition is denoted by a forward slash (/) as the mount point. You should now have Windows (NTFS), swap, and main partitions, as shown in Figure 5-15. Click Forward to continue.
- 102. 66 CHAPTER 5 ■ INSTALLING UBU NTU Figure 5-15. You should have Windows (NTFS), swap, and main partitions before continuing. Stage 9: Enter a Username Next, you’ll be prompted to enter your real name and your username. Real name refers to how you’ll be formally identified on the system to anyone who uses the system and should be typed into the What Is Your Name? text field. The standard practice is to use your full name, including first and last names, separated by a space. The username is how the computer itself will identify you, and this should be typed into the What Name Do You Want to Use to Log In? text field. This name needs to be unique; two users on the same computer cannot have the same username. Also, it must follow these rules: • The username should be one word without any spaces in it. • You can choose any username consisting of uppercase and lowercase letters and numbers, but not symbols and punctuation. • The username cannot begin with an uppercase letter, although you can use upper- case in the rest of the name.
- 103. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 67 The simplest procedure for choosing a username is to use your own first name, typed entirely in lowercase letters. For example, if your name were John Smith, you would type John Smith in the What Is Your Name? box and john as your username, as shown in Figure 5-16. Figure 5-16. You should enter a real name, a username, a password, and, if you wish, a name to give your computer. Following the username, enter a password. Here, the rules are the inverse of those for your username. A good password contains numbers, uppercase and lowercase letters, punctuation marks, and anything else you can get in there! This helps make your pass- word almost impossible for someone else to guess, and thus makes your system more secure. (If you want to be really secure, create a password that’s ten or more characters long.) You’ll need to enter the password twice; the second time confirms that you didn’t make a typo the first time around. The What Is the Name of This Computer? text box contains the hostname for the computer. This is how the computer is identified on certain types of networks, if you choose to share files or resources with other computers. It is also the name that will
- 104. 68 CHAPTER 5 ■ INSTALLING UBU NTU appear at the front of the command-line prompt, as described in Part 4 of this book. Ubuntu will fill in this field automatically based on your username, but you can replace that with something else more personal. The rules for the hostname are broadly similar to those for the username; it cannot contain spaces or symbols. For example, if your computer is a Dell PC, you might type Office_Dell (note that you can use an underscore character in place of a space character). Once you’re finished, click the Forward button. Stage 10: Import Documents and Settings The next step is to migrate accounts by importing documents and settings of existing user accounts from your Windows partition to Ubuntu. (You won’t be prompted to do this if you’re installing Ubuntu on a fresh hard disk or have chosen to overwrite your Windows partition.) Just check the items you would like to import to your account, as shown in Figure 5-17. Then click the Forward button to continue. Figure 5-17. Check the items you would like to migrate from Windows to your account.
- 105. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 69 Stage 11: Confirm Installation Choices At this point, you’ll see the Ready to Install window, which lists the choices you’ve made, as shown in Figure 5-18. It’s a good idea to check to make sure everything is correct before clicking the Install button. Figure 5-18. Confirm the installation choices, and click the Install button to format the new partitions and copy the Ubuntu files across. When you’re ready to install Ubuntu, click the Install button. This will start the instal- lation procedure. The new partitions you created will be formatted, and the Ubuntu files will be copied across. If you click the Advanced button (which isn’t required), you will be prompted to customize the boot loader and join the popularity contest, as shown in Figure 5-19. For the boot loader settings, you have the option not to write the boot loader to the disk. The option makes sense if you already have an existing boot loader, perhaps from another Linux installation, and you would prefer to use it as the primary boot loader for all the operating systems installed on your computer. Checking the Popularity Contest option allows Ubuntu to poll program/package usage in your system and report this information to a central
- 106. 70 CHAPTER 5 ■ INSTALLING UBU NTU server to generate overall statistics on package usage. This information helps Ubuntu developers prioritize which packages to work on based on popularity. The statistics are available at http://popcon.ubuntu.com. Figure 5-19. The Advanced options let you customize the boot loader and contribute to the popularity contest. Stage 12: Wait During Installation Now all you have to do is wait! The Ubuntu installation routine will copy the necessary files and install Ubuntu, as shown in Figure 5-20. It won’t require any further input from you, unless something goes wrong. For example, if you’ve created partitions that are too small in the previous section, this is the point at which you’ll be told. If you do encounter an error, the installation program will quit, and you will need to start it again by clicking the icon on the desktop, this time altering your choices accordingly. Installation should take no more than 30 minutes, and it completed in half that time on most of our test systems.
- 107. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 71 Figure 5-20. All you have to do now is wait while the Ubuntu files are copied across! Stage 13: Reboot and Enjoy Ubuntu! When installation has finished, a dialog box will appear telling you to restart the computer. Once you click the Restart Now button, the DVD will be ejected automatically, and it’s important that you remove it, so that you don’t accidentally boot Ubuntu’s installer again when you restart. In fact, Ubuntu will ask you to remove the disk and press Enter to confirm the removal. Following this, the system will restart. If you’ve installed Ubuntu on a computer that contains Windows, you’ll first see the GRUB boot menu. This offers a number of choices, including the chance to boot Ubuntu into recovery mode, which can help fix your computer (discussed in Chapter 6). You can also choose to boot into Windows. You can switch between the menu choices by using the arrow keys; press Enter to make your selection. You can also run Memtest86, as described previously in stage 4. However, most users can simply press Enter when the menu appears, which will select the topmost entry, thereby booting Ubuntu in normal mode. Alternatively, after 10 seconds, the default choice will be automatically selected. If you installed Ubuntu onto a computer or hard disk without any other operating system, you’ll see a brief countdown timer, during which you can press any key to make
- 108. 72 CHAPTER 5 ■ INSTALLING UBU NTU the boot menu appear. Otherwise, it will be hidden, and after the countdown has finished, Ubuntu will start its boot procedure. Once the boot menu is out of the way and after a few seconds have passed while Ubuntu loads, you’ll see the Ubuntu login screen, as shown in Figure 5-21. From here, you can progress to Chapter 7 to learn how to get started. Alternatively, if you’ve run into any problems, see Chapter 6. Figure 5-21. When the computer has rebooted after installation, the standard Ubuntu login screen will appear. INSTALLING UBUNTU ON AN APPLE MAC Ubuntu can also run on Apple Macintosh computers, as well as PCs, and the DVD-ROM supplied with this book contains everything you need. However, the instructions vary depending on the processor installed in your Macintosh. To find out which type of processor your Mac uses, click the Apple menu and select About This Mac. In the summary dialog box, look for the Processor heading. If the line reads “PowerPC,” see the instructions under that heading. If the line contains “Intel” in combination with any other words, such as “Intel Core Duo,” continue with the following instructions.
- 109. CH A PT ER 5 ■ I NS TA LLI NG UBUNT U 73 Intel If your Mac contains an Intel processor, you might be able to boot from the DVD-ROM supplied with this book and use it to install Ubuntu. However, some extra steps are necessary. If you’re using OS X 10.5, also known as Leopard, you can use Apple’s Boot Camp utility (located in Applications ➤ Utilities) to resize the existing OS X partition. Boot Camp is also used to provide a boot menu to let you switch between OS X and Ubuntu. However, Boot Camp is designed to allow Windows to be installed alongside OS X, so some additional steps are necessary to make it work with Ubuntu. A full guide is provided at the official Ubuntu wiki: https://help.ubuntu.com/community/MacBook. If you’re running OS X Tiger (10.4), you may want to look into using third-party boot menu software called rEFlt (http://refit.sourceforge.net). This utility can also be used in Leopard in place of Boot Camp. Once the computer has been correctly configured by following the guide, you can boot from the DVD-ROM and follow the instructions in the rest of this chapter. Hold down the C key (or Cmd+Shift+Option+Delete on older systems) when the Apple symbol appears during booting to boot from the DVD-ROM disc. PowerPC Ubuntu also works on a Mac based on a PowerPC processor although a special version must be used. Note that the only version commercially supported by Canonical, the company that sponsors Ubuntu, is the older 6.06 release. Newer versions are supported solely by the community. The PowerPC version of Ubuntu on Side B of the DVD-ROM is the 8.04 release of Ubuntu, and is supplied as an .iso image. You’ll need to manually burn this to a blank CD-R or CD-RW, and then boot from it to install Ubuntu. However, first you must create some free space on the hard disk, so you can install Ubuntu alongside your existing operating system (assuming you want to dual-boot OS X and Ubuntu; if you want to let Ubuntu use the entire hard disk, the Ubuntu installer will be able to wipe the existing partitions, and no further action is necessary). Boot from the OS X installation DVD-ROM and quit the installer. Then use Disk Utility from the menus to resize the hard disk in order to make space. To create the Ubuntu install CD, boot to OS X. Next, insert the DVD-ROM with Side B topmost and copy the ubuntu-8.04.1-desktop-powerpc.iso file to the desktop. Insert a blank CD-R or CD-RW, and then start Disk Utility. Select Images ➤ Burn, navigate to the ubuntu-8.04-desktop- powerpc.iso file on the desktop, and then click the Burn button. When the burn has finished, use the disc to boot from and install Ubuntu, following the instructions provided in this chapter. Hold down the C key (or Cmd+Shift+Option+Delete on older systems) when the Apple symbol appears during booting to boot from the CD.
- 110. 74 CHAPTER 5 ■ INSTALLING UBU NTU Summary By following the steps outlined in this chapter, you should now have Ubuntu installed on your computer. We’ve tried to provide you with enough information to get around any problems, as well as explain exactly what’s happening every step of the way. Alas, it’s still possible that you encountered hurdles that weren’t addressed here. In the next chapter, you’ll find solutions to common problems associated with Ubuntu installation.
- 111. CHAPTER 6 ■■■ Solving Installation Problems C hances are that your installation of Ubuntu will complete without a hitch, and you’ll find yourself with a first-rate operating system up and running within just a few minutes. However, if a problem rears its ugly head, you should be able to find the solution in this chapter, which addresses the most common installation problems. These problems are organized by when they occur: before you start Ubuntu’s live distro mode, while running the installation program, and after the installation when you boot for the first time. The final section of the chapter describes how to configure the graphical subsystem with the X.org configuration utility, which can be useful if graphical glitches arise. Preinstallation Problems Some problems might arise before you even boot Ubuntu’s live distro mode in order to run the installation program. This section addresses such issues. Problem When I boot from the Ubuntu DVD-ROM, the drive spins up as if something is happening, but I see nothing. (Alternatively, I see on-screen graphical corruption.) Solution It’s possible the DVD-ROM disc is either dirty or faulty. Examine its surface for scratches, or try cleaning it with a moist tissue. A typical indicator of a dirty or damaged disc is that the drive spins up and then instantly spins down several times in succession—listen to the whir of the drive’s motor to tell if this is the case. If the disc seems okay, it might be that your computer is unable to display the Ubuntu boot menu. To get around this, when you see the blank screen or graphical corruption, press the Esc key twice. Then press Enter. You’ll see the word boot: at the top left of the screen, along with a prompt at which you can enter commands. Type live, and press Enter. 75
- 112. 76 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS Problem The computer boots from the DVD-ROM, but when the boot menu appears, pressing Enter doesn’t start the installation. In fact, nothing happens at all! I’m unable to move up and down through the menu choices either—the keyboard is totally unresponsive. Solution If your PC uses a USB keyboard, it might be that it’s not being recognized by the Ubuntu boot loader. To get around this, it’s possible to make most computers pretend that USB keyboards are older PS/2 keyboards. This is done on a fundamental hardware level and is invisible to the operating system. Here are the steps: 1. Enter the BIOS setup program by pressing Delete during the initial stages of your computer’s boot routine (while memory testing and drive identification are still taking place). Some computers might use a different key combination to enter BIOS setup, such as Ctrl+Insert, but this information will be displayed on your screen. 2. Use the cursor keys to navigate to the Integrated Peripherals section, and then look for an entry along the lines of USB Legacy Support. Set it to Enabled. 3. Press Esc to return to the main menu, and opt to save the changes. 4. Reboot the computer. Note that you should repeat this procedure and deactivate USB Legacy Support once Ubuntu has been installed. At that stage, Ubuntu should be able to recognize the USB keyboard properly. Problem I’m using the same keyboard, mouse, and monitor across several computers, courtesy of a keyboard, video, and mouse (KVM) switch. When Ubuntu boots, the resolution is wrong and the graphics are corrupted. (Also, my keyboard or mouse doesn’t work correctly.) Solution A KVM switch doesn’t allow Ubuntu to correctly probe the attached hardware. Consider attaching the keyboard, monitor, and mouse directly to the computer for the duration of the installation. Problem After I’ve pressed Enter at the boot menu to start booting Ubuntu, the computer freezes and eventually displays a message along the lines of “Kernel Panic.”
- 113. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 77 Solution Kernel Panic errors occur when Ubuntu cannot continue to load for various reasons. In this context, it’s likely that either the DVD is faulty (or dirty) or that your PC has a defective item of hardware. First, check to make sure the DVD is clean and not scratched. If possible, try it on a different computer. If it works, then it’s clearly not at fault, and your computer most likely has a hardware issue. In particular, bad memory can cause problems. Does the computer already have an operating system installed? Does this run without problems? If not, consider replacing your memory modules. To thoroughly test your computer’s memory, boot from the Ubuntu DVD and select the Test Memory option on the menu (use the arrow keys to move up or down in the list, and press Enter to make a selection). This will run the Memtest86 program, and any problems with your memory will be reported in the Errors column on the right side of the program screen. For more details about how to use Memtest86, see www.memtest86.com. Problem Immediately after I press Enter at the boot menu to start Ubuntu’s live distro mode, the computer looks like it has crashed—the graphics are corrupted! Solution Your graphics card may be incompatible with the framebuffer graphical mode used by Ubuntu’s boot routine. You can overcome this problem by following these steps: 1. Reboot the computer, press Escape, and then press F6. 2. You should see a line of text appear below the menu that begins Boot Options. Using the Backspace key, delete quiet splash -- from the end of the line. Then press Enter. If you continue to see graphical corruption, try using the solution to the next problem. Problem When I select the Install Ubuntu option and press Enter, I see a status bar, but when the Ubuntu desktop should appear, it looks like my computer has crashed—all I see is graph- ical corruption. Solution Reboot the computer, and when the Ubuntu boot menu appears, select Ubuntu and press F4. Select Safe Graphics Mode, and then press Enter. This will start Ubuntu using VESA graphics drivers, which are compatible with practically every graphics card made within the last ten years.
- 114. 78 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS If you’re trying this solution after trying the solution to the previous problem. edit the Boot Options line first, as stated in the previous solution, and then press F4 and select Safe Graphics Mode. If, after installing Ubuntu onto your computer’s hard disk, you find that there’s still graphical corruption when you boot Ubuntu, see the instructions under the “Graphical Problems” heading toward the end of this chapter. Problem After I’ve selected the Install Ubuntu option on the menu, the status bar appears, but then the computer freezes. Solution It’s possible the power-saving feature or the advanced programmable interrupt controller (APIC) in your computer is causing problems. Press the F6 key, and after selecting the live or install option, type the following at the end of the Boot Options line that appears: acpi=off noapic nolapic Press Enter when you’ve finished to boot Ubuntu. Problem I’m attempting to install Ubuntu onto a notebook computer. After I select the Install Ubuntu option and press Enter, the screen is filled with graphical corruption, and it looks like Ubuntu has crashed. (Alternatively, the screen looks squashed, or some elements are off-center or off the edge of the screen.) Solution When the Ubuntu boot menu appears, press the Esc key twice and then press Enter. At the boot: prompt, type live vga=771. Then press Enter. Problem During booting, my computer hangs. On screen I see a lot of output, but at the bottom of it are the words aec671x-detect.... Solution When the Ubuntu boot menu appears, press the Esc key twice and press Enter. At the boot: prompt, type live gdth=disable:y. Then press Enter.
- 115. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 79 Problem The Ubuntu DVD-ROM seems to boot into the Ubuntu installer program, but then the screen goes blank, and my monitor flashes an error along the lines of “Cannot display this mode” or “Out of mode.” (This problem might affect users of widescreen monitors in particular.) Solution It sounds like the graphical configuration Ubuntu automatically generates for your computer isn’t correct. Reboot the computer, and when the Ubuntu boot menu appears, select Install Ubuntu, press F4, and then select Safe Graphics Mode. Then press Enter. This will start Ubuntu using VESA graphics drivers, which are compatible with practically every graphics card made within the last ten years. Alternatively, it’s possible that, although the screen is blank, the Ubuntu login screen is running in the background. You can, therefore, try logging in “blind” (that is, without any visual feedback on screen). Type your username, press Enter, type your password, and press Enter again. At this point, you may find that the desktop appears as it should. Then use the Screen Resolution program (System ➤ Preferences) to set the correct resolution and refresh rate. NONE OF THESE SOLUTIONS WORK! If you run into installation problems for which you can’t find a solution here, you can try using the text- mode based installation option on the DVD-ROM boot menu. Simply select Install Ubuntu in Text Mode. This is often referred to as the “alternate install” because it doesn’t boot into the graphical installer; instead, it boots to an older but reliable text-mode installation program. From there, you can follow the prompts to install Ubuntu. Unfortunately, there isn’t space to provide a full installation guide here, although most installation options should correspond loosely to those discussed in Chapter 5. We've also provided an .ISO image of a CD version of Ubuntu that uses the alternate installer. This can be found on Side B of the DVD-ROM. You can learn more about it in Appendix D. Installation Problems Once the DVD-ROM has booted in live distro mode, and you’ve run the installation program, you may get error messages or experience other difficulties. This section offers some solu- tions to common installation problems. Problem I’ve partitioned my disk and clicked to start the installation, after which the Installing System progress bar appears. However, it stops at a certain percentage with an error message.
- 116. 80 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS If I click the Continue button, everything continues, and at the end, I’m offered the chance to reboot into the new installation. However, when I reboot, the Ubuntu desktop doesn’t appear. Instead, all I see is a black screen with a text-mode login prompt. Solution For some reason, vital Ubuntu software hasn’t been correctly copied to the machine. At the login prompt, type your username, and type your password when it’s requested. Then, at the command prompt, type the following: sudo apt-get update [At this point you'll need to type your password; do so] sudo apt-get –f install sudo apt-get install ubuntu-desktop You should ensure the DVD-ROM is inserted. If you find this doesn’t work, follow the instructions in the “None of These Solutions Work!” sidebar, and install Ubuntu using the alternate installer. Problem When the Ubuntu installation program gets to the Starting Up the Partitioner stage, it reports that it can’t find any hard disk in my computer. Solution There are many possible reasons for this, but here are three potential solutions that you might try in sequence: 1. Select Manual and click the Forward button. You should see a list of hard disks with each of its partitions displayed, and you should then be able to follow the instruc- tions under the “Manually Edit the Partition Table” heading in Chapter 5. 2. Ensure the jumpers are set correctly on the hard disk (consult the hard disk’s doc- umentation if necessary). This is particularly worth checking if you have more than one hard disk. If this doesn’t solve the problem, and your second hard disk is non- bootable (that is, it’s used only for data storage), try temporarily removing it, and then install Ubuntu. Reconnect it after installation has completed. 3. See the “None of These Solutions Work!” sidebar to learn how to use the alternate installer. This contains an older installation program that many consider more reliable on some problematic computers.
- 117. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 81 Problem When I try to install Ubuntu, the Prepare Disk Space screen shows one (or several) addi- tional small hard disks, usually identified as /dev/sda followed by a number. Solution If you have a USB memory stick inserted, or a photographic card reader, it will be identified by the Ubuntu installer in this way. You can ignore this or, if you want to avoid confusion, quit the installer, remove the memory stick or card reader, and restart the installer program. Problem When manually partitioning, I see an error message to the effect that I can’t have more than four primary partitions. Solution This is a limitation in how hard disks work and not an issue with Ubuntu. You will need to create logical partitions instead of primary partitions to have more than four partitions in a hard disk. On a technical level, Ubuntu creates an extended partition to contain your new logical Ubuntu partitions. To resolve the problem, when creating a new partition, select Logical as the type of partition. For more details about primary and extended hard disk partitioning, see http:// en.wikipedia.org/wiki/Disk_partitioning. Postinstallation Problems Problems might also occur after you install Ubuntu. This section addresses several possible postinstallation problems. This section covers only problems that appear immediately after installation—those that prevent Ubuntu from working correctly immediately after its first boot. Issues surrounding the configuration of hardware or software are dealt with in Chapter 8 of this book. Problem I use a widescreen monitor (or a widescreen notebook). When I boot to the desktop, the reso- lution is set too low. When I try to switch resolutions (by clicking System ➤ Preferences ➤ Screen Resolution), the resolution my monitor usually runs at isn’t available in the list. Solution In a minority of cases, the open source drivers for ATI and NVIDIA cards can’t support certain resolutions on particular monitors. One solution is to install proprietary graphics
- 118. 82 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS drivers, as discussed in Chapter 8, although you should also update your system online as soon as possible (see Chapter 9) to see if the open source graphics drivers have been updated and improved. In both cases, you’ll need to configure your computer to go online, which is also explained in Chapter 8. Problem After booting up, my USB mouse and/or USB keyboard are not recognized. Solution Try unplugging the keyboard and/or mouse, and then reattaching them. If you find they now work, log in to Ubuntu, and perform an online system upgrade. See Chapter 9 for more information about this task. If this fails to solve the problem, you can configure your BIOS to pretend your mouse and keyboard are traditional PS/2-style devices, as follows: 1. Enter the BIOS setup program by pressing Delete during the initial stages of your computer boot routine (while memory testing and drive identification are still taking place). Some computers might use a different key combination to enter BIOS setup, such as Ctrl+Insert, but this information will be displayed on your screen. 2. Use the cursor keys to navigate to the Integrated Peripherals section, and then look for an entry along the lines of USB Legacy Support. Set it to Enabled. 3. Press Esc to return to the main menu, and opt to save the changes. 4. Reboot the computer. Problem When I boot for the first time, I see an error message along the lines of “No operating system could be found on the hard disk.” Solution It seems that, for whatever reason, the GRUB boot loader wasn’t installed correctly. Boot from the DVD-ROM, and select Try Ubuntu Without Any Change to Your Computer when prompted. When the Ubuntu desktop appears, click Applications ➤ Accessories ➤ Terminal. This will open a command-prompt window. Type the following commands in sequence: sudo grub root (hd0,1) setup (hd0) quit
- 119. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 83 Then restart Ubuntu (click System ➤ Quit). Ensure you remove the DVD-ROM when prompted. You should find that the Ubuntu boot menu now appears when you boot. Problem After I’ve installed Ubuntu, Windows will no longer boot, although Ubuntu works fine. After I select Windows from the boot menu, the Windows boot procedure either freezes when “Starting Windows . . .” appears or the boot status bar is shown, but the desktop never appears. Solution Try repairing your Windows disk using the Windows command-line tool chkdsk. This can be done from the recovery mode of the Windows installation CD/DVD, but the instructions for how to do this vary depending on if you’re running Windows Vista or XP. Windows Vista If you’re running Windows Vista, follow these steps to run chkdsk: 1. Insert the Windows Vista installation DVD and select to boot from it. For details on how to configure your computer to boot from the DVD, see stage 2 of the Ubuntu installation guide in Chapter 5. 2. You’ll see the message “Windows is Loading Files,” along with a progress bar. Once this has cleared, select your language/locale settings from the Install Windows dialog box, and then click Next. 3. On the next screen, don’t click the Install Now button. Instead, click the Repair Your Computer link at the bottom-left corner of the window. 4. In the System Recovery Options dialog box, select your Windows Vista partition, and then click Next. 5. On the next screen, select Command Prompt. 6. In the command-prompt window that appears, type the following (this assumes Vista is installed on drive C:): chkdsk c: /R 7. Wait until the check has completed, and then type exit at the prompt. 8. Back in the System Recovery Options dialog box, click Restart. This will reboot your computer. Be sure to eject the Windows Vista DVD before doing so.
- 120. 84 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS Windows XP If you’re running Windows XP, follow these steps to run chkdsk: 1. Insert the Windows XP installation CD, and select to boot from it. For details of how to configure your computer to boot from the CD, see stage 2 of the Ubuntu instal- lation guide in Chapter 5. 2. You’ll see status messages that Windows is loading driver files. Eventually, the Windows Setup menu will appear. Press R to start the Recovery Console. 3. You’ll be asked to confirm which Window installation you would like to boot into; do so. 4. You’ll then be prompted for the administrator’s password. If you don’t have one, simply press Enter. 5. At the command prompt, type the following: chkdsk c: /R 6. Wait until the check has completed, and then type exit at the prompt. This will reboot your computer. Be sure to eject the Windows XP CD before rebooting. Problem When I boot for the first time, all I see is a black screen with some text at the top saying “Ubuntu hardy ubuntu tty1” and beneath that “ubuntu login:.” Solution For some reason, the automatic configuration of your graphics card failed during installa- tion. See the following section for instructions on configuring your GUI manually. Graphical Problems Although Ubuntu is extremely adept at automatically detecting and configuring your PC’s graphics hardware, it sometimes gets things wrong. Such problems are characterized by one of the following:
- 121. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 85 • Ubuntu freezes when the desktop would normally appear. • You see on-screen graphical corruption of either text or graphics. • The resolution is set too low or too high, and you can’t change it to the correct reso- lution because it isn’t offered. • You see a black screen with only a text login prompt. Troubleshooting graphical problems has never been as easy as in the latest versions of Ubuntu. Starting with Ubuntu 7.10, code-named Gusty Gibbon, Ubuntu has added a system component called BulletProofX. This is a kind of rescue program that ensures that X.org (Ubuntu’s graphical subsystem, often referred to simply as X), will run in low- graphics mode should X.org fail to start with the current display settings. In other words, it’s a lot like Safe Mode that you might be used to with Microsoft Windows. Low-graphics mode uses 640×480 or 800×600 resolution, 16 or 256 colors, and a VESA driver to operate the graphics card. Obviously, these are not optimal settings for using the desktop, but they’re chosen for their wide compatibility with most graphics hardware. Upon reaching low-graphics mode, you are given an option to run the Screens and Graphics utility. You can use this tool to customize and test display settings until you find the one that works for you. ■Note On a technical level, Hardy Heron now uses the latest version of X.org, 7.3. This version of X.org is able to autodetect and autoconfigure monitors, graphic cards, and mice, which means manual customization of display settings—long the bane of Linux users around the world—is rarely necessary. Because of this, the command-line reconfiguration utility dpkg-reconfigure xorg-xserver, which was previously used to set the monitor, graphics card, and keyboard settings, has been stripped down to customizing the framebuffer (a method of accessing the graphics card memory) and the keyboard settings. It’s unlikely you’ll ever need to use it. Additionally, if your computer utilizes a recent NVIDIA or ATI 3D graphics card, you can try installing the proprietary drivers. This is best done when the system is up and running, so follow the instructions here to get a workable graphical system and then follow the instructions in the “Installing 3D Drivers and Activating Desktop Visual Effects” section of Chapter 8. Installing a proprietary driver might be the only way to get visual desktop effects working and utilize the full resolution of a widescreen monitor.
- 122. 86 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS Using the Screens and Graphics Utility As we mentioned, if X.org fails to start based on the current graphical settings, the low- graphics mode of X.org will run with minimal display settings, as shown in Figure 6-1. In low-graphics mode, you have an option to launch the manual graphical configuration tool, the Screens and Graphics utility. Technically, this utility is made possible through the displayconfig-gtk package. The program can also be run while Ubuntu is up and running by opening a terminal window (Applications ➤ Accessories ➤ Terminal) and typing gksu displayconfig-gtk. This can be useful if your graphical subsystem works okay but not optimally and you wish to tweak the settings. Figure 6-1. X.org runs in low-graphics mode when the current graphical settings are not compatible with the hardware of the computer You have three options at this point: configure the display settings, shut down the computer, or continue loading the Ubuntu desktop in low-graphics mode. While continuing to load the desktop can be useful if you want to grab some files, in order to properly configure your computer, you should click the Configure button to run the Screens and Graphics utility. An Overview of the Screen and Graphics Card Settings The Screens and Graphics utility allows you to configure the screen and graphics card settings. The Screen tab, shown in Figure 6-2, contains the following settings: Screen: This option allows you to select the display monitor that you would like to configure. If you have only one monitor, then you will see only one entry in this list. Monitor model: This option allows you to provide the technical characteristics of your monitor such as horizontal range, vertical refresh rate, and widescreen-capable. You can also select from a list of branded and generic monitors, plug-and-play, and autodetection.
- 123. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 87 Resolution and refresh rate: These options allow you to set the default resolution and corresponding refresh rate. Both should match the technical capabilities of your monitor or you risk damaging your monitor. Aside from checking the manual or spec- ification list of your model, you can peruse Table 6-1 for typical resolutions for cathode ray tube (CRT) and thin film transistor (TFT) screens. For the refresh rate, the safest option is 60Hz. Screen arrangement: You have options to set the primary monitor, mirror the displays, extend the area of the monitor to another monitor, or disable using the monitor alto- gether. These options are useful if you have multiple monitors and your graphics card can support them. Figure 6-2. The Screen tab lets you customize the monitor’s model and arrangement, refresh rate, and resolution. The Graphics Card tab allows you to set the technical characteristics of your graphics card, such as the graphics card driver and its video memory, as shown in Figure 6-3. Though it’s safe to leave the video memory for autodetection, if you encounter problems, you can set this information manually. You can determine the video memory size from the manual or from the graphics card information that pops up on your monitor when your computer starts up.
- 124. 88 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS After you make any changes, you can test the settings by clicking the Test button. This is advisable, especially before you select to permanently save your new configuration. Table 6-1. Typical Monitor Resolutions Monitor Size Typical Resolutions CRT Monitors 14 inches 800×600, 640×480 15 inches 800×600, 640×480 17 inches 1024×768, 800×600, 640×480 19 inches 1280×1024, 1024×768, 800×600, 640×480 20 inches 1600×1200, 1280×1024, 1024×768, 800×600, 640×480 TFT Screens 14 inches 1024×768 15 inches 1024×768 17 inches 1280×1024 19 inches 1280×1024, 1440×900 (widescreen) 20 inches 1680×1050 (widescreen) 21 inches 1600×1200 22 inches 1680×1050 (widescreen) 23 inches 1920×1200 (widescreen) 24 inches 1920×1200 (widescreen) 26 inches 1920×1200 (widescreen) 27 inches 1920×1200 (widescreen) 28 inches 1920×1200 (widescreen) 30 inches 2560×1600 (widescreen) 40 inches 1366×768 (widescreen)
- 125. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 89 Figure 6-3. On the Graphics Card tab, you can set the appropriate video card driver and video memory. Configuring Your Display Let’s go through the steps for configuring your display. 1. From the menu shown in Figure 6-1, click the Configure button to run the Screens and Graphics utility. You will see the screen shown in Figure 6-2. 2. Click the drop-down list next to the Model heading. 3. You will see the dialog box shown in Figure 6-4. The default selection is plug-and-play, where X detects monitor settings when Ubuntu is booting up. If you’ve encountered problems with the display, you can make the following adjustments. Click OK when you’re finished making changes. • Select a manufacturer in the left list box and the appropriate model in the right list box. If your monitor is not listed, you can select the “Generic” manufacturer from the left list box (it's at the top of the list, rather than alphabetical) and choose the appro- priate model in the right list box based on monitor type (TFT or CRT) and resolution. This type of setting is normally used for laptops, since the manufacturer and model of the liquid crystal display (LCD) screen is not available to you.
- 126. 90 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS Figure 6-4. Ubuntu allows you to set the technical characteristics of your monitor in several ways. • Add monitor settings by importing the configuration from your monitor driver CD. This is useful if your monitor is relatively new and features a resolution higher than the resolutions in the generic manufacturer list. To use the import feature, insert the driver CD and click the Add button. The import window will be displayed, as shown in Figure 6-5. Click File System on the left pane and in the right pane, double-click media. Then double-click cdrom to be able to view the contents of your CD. Browse the CD until you find the .inf file of your monitor, and then click Import. At this point, you should be able to select the exact model from the monitor model list. • Click the Detect button to let the Screens and Graphics utility detect the hori- zontal range and vertical refresh rate. However, this just reverts the setting back to plug-and-play detection, which obviously hasn’t worked on your particular system because you were unable to boot up. • Fine-tune the settings by specifying whether the monitor is the widescreen type. See Table 6-1 for guidance on typical resolutions for monitors, although you should refer to your monitor documentation as well, especially if you’re using a wide- screen monitor (or a notebook with a widescreen display). 4. Select the desired screen resolution by clicking the Resolution combo box, as shown in Figure 6-6. The list of available resolutions is based on the monitor settings you provided in step 3.
- 127. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 91 Figure 6-5. You can import monitor settings from the driver CD that came with your monitor. Figure 6-6. The list of resolutions to choose from is based on the monitor settings you provided. 5. Select the refresh rate by clicking the Refresh Rate combo box, as shown in Figure 6-7. The safest setting is to use the refresh rate of 60Hz. The refresh rate list is based on your monitor settings (step 3) and resolution settings (step 4). As another precaution, check your monitor documentation for the appropriate refresh rate for your monitor.
- 128. 92 CHAPTER 6 ■ SOLVING INS TA LLATION PROBLEMS Figure 6-7. The list of available refresh rates is based on your monitor settings and resolution settings. 6. Click the Graphics Card tab. You have the option to specify the driver and video memory of your graphics card. The detected card is displayed to aid you in selecting the appropriate graphics driver (see Figure 6-3). You can safely leave the setting for the video memory as automatic, unless you encounter problems with your graphics card. 7. Click the Driver drop-down list to select a graphics driver. You can select a driver based on its name by clicking the drop-down list next to the Choose Driver By Name heading. The names of the drivers are typically the product names, model, or codes of the graphics cards. If selecting by driver name is not intuitive, you can choose the driver by clicking Choose Driver By Model and selecting the manufac- turer in the left list box and the model in the right list box, as shown in Figure 6-8. The safest choice is to choose the VESA option. This driver works on virtually every graphics card. Click the OK button when you’re finished. ■Note Using the VESA driver entails a slight performance penalty, particularly when it comes to video play- back. Therefore, you might choose to reconfigure X.org again in the future when your knowledge of Linux improves. 8. At this point, you can click the OK button to save and use the new settings or click the Test button to check if the desired settings are compatible with your hardware.
- 129. CH AP T ER 6 ■ SO LVI NG I NST A LLA TI O N PRO BLEMS 93 Figure 6-8. You can specify the driver of your video card by name or model. Summary This chapter’s goal was to address problems that might occur during the installation of Ubuntu. It discussed preinstallation, installation, and postinstallation issues. It also covered how to use the Screens and Graphics utility to configure the graphics subsystem, which may be necessary if the installation program failed to properly recognize your graphics card or monitor. You should now have Ubuntu installed. The next part of this book focuses on helping you get everything up and running. You’ll learn essential skills and become a confident Linux user.
- 131. PART 3 ■■■ The No-Nonsense Getting Started Guide
- 133. CHAPTER 7 ■■■ Booting Ubuntu for the First Time N ow that Ubuntu is installed, you’ll no doubt want to get started immediately, and that’s what Part 3 of this book is all about. In later chapters, we’ll examine specific details of using Ubuntu and getting essential hardware up and running. We’ll also look at personal- izing Ubuntu so that it works in a way that’s best for you on a day-to-day basis. But right now, the goal of this chapter is to get you doing the same things you did under Windows as quickly as possible. This chapter explains how to start up Ubuntu for the first time and work with the desktop. It also looks at how some familiar aspects of your computer, such as using the mouse, are slightly enhanced under Ubuntu. Starting Up If you’ve chosen to dual-boot with Windows, the first Ubuntu screen you’ll see is the boot loader menu, which appears shortly after you switch on your PC. If Ubuntu is the only operating system on your hard disk, you’ll see a brief one-line message pointing out that if you press a key, you can access this boot menu. You won’t need to do so unless you want to access the recovery mode boot settings. In fact, if Ubuntu is the only operating system on your computer, you can skip to the next section of this chapter. ■Note The boot loader is actually a separate program called GRUB. This program kicks off everything and starts Ubuntu. The boot loader menu you see when your PC is set to dual-boot has three or four choices, as shown in Figure 7-1. The top one is what you need to boot Ubuntu. The Ubuntu option will be selected automatically within 10 seconds, but you can press Enter to start immediately. 97
- 134. 98 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME Figure 7-1. The default choice is fine on the boot menu, so press Enter to start Ubuntu. You should find that you also have an entry for Windows, located at the bottom of the list. To boot into Windows, simply use the cursor keys to move the selection to the appro- priate option, and then press Enter. You should also see an entry ending in “(recovery mode).” This is a little like Safe Mode within Windows. If you select recovery mode, Ubuntu will boot to a text mode menu with three options: Resume – Resume normal boot: This option allows you to boot normally, as if you didn’t need to fix anything at all. However, the big difference with this option compared to a graphical boot is that Ubuntu boots in text mode, which means that you are able to see system messages as Ubuntu is booting up. If you have problems with booting Ubuntu, you can run in recovery mode and choose this option to find error messages in the boot process. Root – Drop to root shell prompt: This option boots with conservative system settings and then presents you with a command-line prompt in administrator mode (you run as the root user—see Chapter 29 for more information on the root user account). The typical usage of the administrator prompt is to change passwords of users if they forgot their passwords, free up disk space to run normally, and uninstall buggy software to bring back system stability. The system commands that can be used for recovery are passwd, mv, rm, cp, mkdir, and dpkg. These are discussed further in Chapters 13 (copying, deleting, and moving files and folders), 28 (uninstalling packages) and 29 (changing passwords). When you’ve finished, type exit to return to the recovery menu.
- 135. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 99 Xfix – Try to fix X server: This option replaces the current keyboard, screen, mouse, and graphics configuration with the information it has gathered through autodetection. Refer to the “Graphical Problems” section in Chapter 6 for information about trouble- shooting X server-related issues When you update your system software, you might find new entries are added to the boot menu list. This is because the kernel has been updated. The kernel is the central system file that Ubuntu relies upon, and essentially, the boot menu exists to let you choose between different kernels. Without exception, the topmost entry is the one you’ll want each time to boot Ubuntu, because this will always use the most recent version of the kernel, along with the latest versions of other system software. The entries beneath this will start the system with older versions of the kernel and are provided in the unlikely situation that the latest kernel causes problems. ■Note All operating systems need a boot loader—even Windows. However, the Windows boot loader is hidden and simply starts the operating system. Under Ubuntu, the boot loader usually has a menu, so you can select Linux or perhaps an option that lets you access your PC for troubleshooting problems. When you gain some experience with Ubuntu, you might choose to install two or more versions of Linux on the same hard disk, and you’ll be able to select among them using the boot menu. Logging In After Ubuntu has booted, you should see the login screen, as shown in Figure 7-2. Here, you enter the username and the password you created during the installation process. Clicking the Options button in the bottom-left corner of the screen brings up a menu from which you can opt to reboot the system or shut it down. The user account you created during installation is similar to what Windows Vista and XP refer to as an “administrator” account. This means that the account you use on a day- to-day basis can also change important system settings and reconfigure the system. However, the main difference between Ubuntu and Windows is that you’ll need to enter your password to make any serious changes, rather than clicking in a confirmation dialog box, as you do with Vista (of course, XP doesn’t have any kind of confirmation require- ment at all!). Don’t worry about damaging anything accidentally; trying to reconfigure the system or access a serious system setting will invariably bring up a password prompt. You can simply click the Cancel button if you don’t want to continue.
- 136. 100 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME ■Note Unlike some versions of Linux, Ubuntu doesn’t encourage the user to use an actual root (or admin- istrator) account. Instead, it operates on the principle of certain ordinary users adopting superuser privileges that allow them to administer the system when they need to. The user account you create during setup has these privileges. Figure 7-2. Type your username, enter your password, and then press Enter to log in. Exploring the Desktop After you’ve logged in, you’ll see the welcoming theme of the Ubuntu desktop, as shown in Figure 7-3. Feel free to click around and see what you can discover. There’s little chance of you doing serious damage, so let yourself go wild and play around with your new oper- ating system! However, be careful if any dialog boxes ask you to type your password—this indicates that you’ve clicked an action that has the potential to change the system in a fundamental way.
- 137. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 101 ■Tip Although you can’t damage the system by messing around, you might find that you somehow cause programs to work incorrectly. Don’t worry if this happens. You can always create a new account for yourself following the instructions in Chapter 29. When using this new account, you should find all the settings are returned to normal, and you’ll be back to square one! Figure 7-3. Feel free to experiment with the Ubuntu desktop and see what you can discover. First Impressions The first thing you’ll notice is that the desktop is clean compared to Windows. You don’t have a lot of icons littering the screen. Of course, you can fill the desktop with all of the icons you please. As with Windows, you can save files to the desktop for easy access. In addition, you can click and drag icons from any of the menus onto the desktop in order to create shortcuts.
- 138. 102 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME Along the top of the desktop, you see three menus: Applications: This menu is the equivalent of the Windows Start ➤ Programs menu. Here, you’ll find access to all the software available under Ubuntu. Places: This menu is somewhat like My Computer in Windows, in that it gives quick access to locations within the file system. The Places menu also provides access to network locations, such as file servers (this will probably be important only if you use Ubuntu in a business context). System: This menu is a little like the Windows Control Panel, in that it allows you to change various system settings. The Preferences submenu lets you change trivial system settings, such as the screensaver, or start new system services, such as the remote desktop service that lets you view your desktop across a network connection. The Administration submenu lets you change underlying system settings, such as configuring new hardware (like printers) and installing software. The counterpart of the Windows Recycle Bin lives at the bottom-right corner of the screen as a small icon and is called the Trash. Although diminished in stature compared to the Windows representation, it works in a similar way: you can drag icons and files onto the icon to delete them, and you can click it to open the Trash and salvage files. ■Note There’s one important difference between the Recycle Bin in Windows and Ubuntu’s Trash. By default, the Recycle Bin uses only uses 10% of the remaining space on a hard disk. After this, the oldest items are automatically deleted. With Ubuntu’s Trash, the only limit on the contents is the remaining free space on the disk. Nothing will ever be removed from the Trash unless you specifically choose to do remove it. The mouse works largely as it does in Windows, in that you can move it around and click on things. You can also right-click virtually everything and everywhere to bring up context menus, which usually let you alter settings. And you should find that the scroll wheel in between the mouse buttons lets you scroll windows. Whenever Ubuntu is busy, an animated, circular icon will appear that is similar in principle to the hourglass icon used in Windows. It also appears when programs are being launched. ■Caution Bear in mind that Ubuntu isn’t a clone of Windows and doesn’t try to be. Although it works in a similar way—by providing menus, icons, and containing programs within windows—there are various potholes in the road that can trip up the unwary.
- 139. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 103 Shutting Down or Restarting Ubuntu You can shut down or reboot your PC by selecting the System ➤ Quit menu option. Alter- natively, you can click the icon at the top-right corner of the screen. Either method will open a dialog box showing icons for various options, as follows and as shown in Figure 7-4: Log Out: This option will log you out of the current user account and return you to the Ubuntu login screen. Any open programs will be shut down automatically. ■Caution During shutdown or logout operations, Ubuntu sometimes automatically shuts down applica- tions that contain unsaved data without prompting you, so you should always save files prior to selecting any of the options here. Lock Screen: This will enable the screensaver and password-protect the system. The only way to leave Lock Screen mode is to enter the user’s password into the dialog box that will appear whenever you move the mouse or press a key. Switch User: This will let you switch between two or more user accounts, if they’re set up on the system (Chapter 29 discusses how to add user accounts). Therefore, you’ll be returned to the Ubuntu login screen. Unlike the Log Out option, the user’s session will continue running in the background while the computer is used to log in to a different user account. To switch back to the original user, select Switch User again, and type the original username and password. You’ll be asked if you want to return to the previous session or create another session for the user. Be careful, however, because any new session will terminate the old session automatically. Suspend: This uses your computer’s suspend mode, in which most of the PC’s systems are powered down except for the computer’s memory. Suspend mode is designed to save power and allow a quick reactivation of the PC. Not all computers support suspend mode, however, so you should experiment to see if your computer works correctly. Ensure you save any open files before doing so. Hibernate: This saves the contents of the computer’s memory to the hard disk and then completely powers down the computer. When the computer is reactivated, the user chooses to start Ubuntu as normal, and the memory contents are read in from disk. This allows a faster startup and allows users to resume from where they were last working. For the hibernate feature to work, the swap file needs to be as large as or larger than the main memory. Ubuntu’s installation program should have automatically done this, but if you didn’t dedicate enough disk space to Ubuntu when repartitioning, it might not have been able to do so. The only way to find out is to attempt to hiber- nate your system and see if it works.
- 140. 104 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME ■Caution Some users have reported that their computer is sometimes unable to “wake” from hibernation, so you should save any open files before hibernating as insurance against the unlikely prospect that this happens. We’ve seen this happen a few times, although hundreds of other times it’s worked fine. Restart: This option will shut down Ubuntu and then restart the computer. Shut Down: This will shut down Ubuntu and then power off your computer, provided its BIOS is compatible with the standard shutdown commands (all computers bought within the past five years or so are; if you find that the computer hangs at the end of the Ubuntu shutdown procedure, simply turn it off manually via the power switch). Figure 7-4. A variety of shutdown operations are available, some allowing for a quick resumption later on.
- 141. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 105 WRONG RESOLUTION! You might find when you boot up that Ubuntu has defaulted to the wrong resolution. In other words, everything might be a little too large or too small. You might have trouble reading text, for example, or you might find that program windows fill the screen to the extent that their contents partially disappear off the edges. Changing the resolution is simple. Select System ➤ Preferences ➤ Screen Resolution from the menu (at the top of the screen). In the Resolution drop-down list, select the appropriate setting for your monitor. For a 17-inch CRT monitor, the standard resolution is 1024×768 (although some people prefer 800×600). Most 17-inch TFT screens run at 1280×1024 resolution. A 15-inch TFT screen will usually run at 1024×768 resolution. For laptops, 13-inch to 15-inch LCD panels typically run at 1280×800 resolution. If you have a 15-inch CRT monitor (common on PCs made before 2000), you’ll probably find 800×600 a maximum setting; others prefer 640×480. If you’re in doubt as to your monitor’s resolution, consult your monitor’s manual for more information. If the resolution you want isn’t available, Ubuntu might have incorrectly set up your graphics card and monitor. See the “Graphical Problems” section in Chapter 6 to learn how to reconfigure the graphical subsystem. Desktop Elements The Ubuntu desktop is similar to that of Windows. It has the following elements: Menus: The three menus at the top left of the screen provide access to all of Ubuntu’s functionality. As noted earlier, the Applications menu provides access to programs; the Places menu provides access to the file system, and the System menu provides access to configuration settings (as well as the Log Out option). You can click and drag practically every menu entry onto the desktop in order to create a shortcut. Icons: Although the Ubuntu desktop is largely clean, some icons are tucked away at the top and bottom of the screen. Those at the top are located to the right of the menus and allow you to start the browser, e-mail client, and help system (and they are arranged in that order). At the top right is a speaker icon that lets you alter the sound volume, along with the Quit icon (additionally, if your system is online, you might see the System Update icon—this is explained in Chapter 9). At the bottom left is the Hide Windows button that instantly minimizes all open windows to give access to the desktop underneath. At the bottom right are the two virtual desktop buttons, which I’ll discuss in the “Working with Virtual Desktops” section later in this chapter, and also the Trash icon.
- 142. 106 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME ■Note If you’re dual-booting with Windows, you might see an icon at the top left of the desktop that will let you access your Windows files. On one system, this was identified as shda1. Double-click the icon to view the Windows file system. Similarly, if you have a memory card reader or digital camera plugged into your PC, you might see desktop icons for them too, and any inserted CD/DVD discs will also be represented by desktop icons. Window List: The bar at the bottom of the screen, called the Window List, shows which programs are currently running (if any). As with Windows, you can simply click the button for any program to bring that window “to the top.” Alternatively, you can right-click each entry to instantly minimize or maximize that particular window. Clock: The clock is located at the top right of the screen. Clicking it brings up a handy monthly calendar and a drop-down panel that contains a mini world map, regional time, and weather for several locations. Click it again to hide this display. Right-clicking the clock brings up a context menu. On this menu, the Preferences option lets you alter the way the date and time are displayed. The Adjust Date & Time option lets you change the time and/or date if they’re incorrect. Notification area: The speaker icon and clock are located in the notification area, which is similar to the Windows system tray. Programs that like to hang around in memory, such as the Rhythmbox media player, will add an icon in this top-right area, to allow quick access to their functions. The Software Update Notifier appears in this area to let you know that software updates are available (similar to Windows Update). Network Manager displays an icon here when you are connected to the network. The notification area also has icons for other Ubuntu tools, such as the Tracker (for searching for your data) and the Restricted Device Manager (for managing propri- etary drivers). Usually, you simply need to click (or right-click) their icons to access the program features. ■Tip The small bar marks the leftmost boundary of the notification area. To resize the notification area, right-click this bar and remove the check from the Lock to Panel menu entry. Then you can click and drag the bar to a different size. This might be handy if the notification area starts to fill up with icons! BEHIND THE DESKTOP: GNOME Although we refer to the Ubuntu desktop, the fundamental software behind it is created by GNOME: The Free Software Desktop Project. This is one of the most well-established organizations currently producing desktop interfaces for Linux, as well as for other versions of Unix. Its home page is www.gnome.org.
- 143. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 107 Although it’s based on GNOME, Ubuntu’s desktop has its own set of individual features and programs, as well as a unique look and feel. That said, it works in an almost identical way to versions of GNOME that are used in other Linux distributions, such as Fedora. The nature of open source software—whereby anyone can take the source code and create their own version of a program—makes Ubuntu’s remodeling of the GNOME desktop possible. Unlike with Windows software, more than one current version of a particular program or software suite can exist, and each is usually tailored to the particular needs of one of the various Linux distributions. There are also versions of Ubuntu built around KDE (www.kde.org) and Xfce (www.xfce.org), two similar desktop environments. They’re called Kubuntu and Xubuntu, respectively, and they’re supplied on the DVD-ROM that comes with this book. For more details, including installation instructions, see Appendix D. Quick Desktop Guides Refer to Figure 7-5 for an annotated diagram of the desktop. The figure includes an open menu, browser window, and program window, so you can get an idea of working from the desktop. As another handy reference, Table 7-1 lists standard Windows desktop features and where similar functionality can be found on the Ubuntu desktop. Figure 7-5. The Ubuntu desktop is broadly similar to the Windows desktop, with a few minor differences.
- 144. 108 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME Table 7-1. Windows Desktop Features Equivalents Under Ubuntu Windows Function Description Ubuntu Equivalent My Computer/ Double-clicking the My Computer/ Click Places ➤ Computer to see all the Computer Computer icon gives you access to drives attached to the computer in the PC system. In particular, it lets the file browser window. If you wish you browse the file system. to browse the file system, double-click File System in the list on the left side of the file browser window. Recycle Bin The Recycle Bin is the repository of Click the small Trash icon located at deleted files. the bottom-right corner of the Ubuntu desktop. Start menu The Start menu provides access to This function is split between the many computer functions, as well as Applications and System menus. The a list of the programs installed on the Applications menu provides access to system. software installed under Ubuntu. The System menu lets you configure and administer the system, similar to the Windows Control Panel. Quick Launch toolbar Located just to the right of the Start Similar icons are located to the right button, these small icons let you of the main menus at the top of the launch popular programs with a Ubuntu desktop. You can add your single click. own entries here by clicking and dragging program icons from the Applications menu. My Network Places/ This icon is used to access network To browse the local network, click Network Neighborhood services, usually within a business Places ➤ Network Servers. environment (on newer versions of Windows, this icon is often hidden by default). My Documents/ The My Documents/Documents The user’s Home folder serves this pur- Documents folder, accessed via its icon on the pose and can be accessed by clicking Windows desktop, is a storage space Places ➤ Home Folder. set aside for a user’s documents. Control Panel The Windows Control Panel, located Similar functionality can be found off the Start menu, allows the user under the System ➤ Administration to change system settings and and System ➤ Preferences menu preferences. options. Find Files/ Located on the Start menu, the To find files, click Places ➤ Search for Start Search Find Files/Start Search function Files. You can also click the Deskbar lets a user search the file system for applet, located to the left of the notifi- missing items. cation area, or the Tracker search tool icon, located in the notification area, to search for files. Shutdown/Reboot At the bottom of the Start menu Clicking System ➤ Quit brings up a within Windows is the Shutdown/ dialog box that is almost identical to Reboot button. the one displayed in Windows XP and offers the same options as the Windows Vista shutdown submenu.
- 145. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 109 Table 7-1. Windows Desktop Features Equivalents Under Ubuntu (Continued) Windows Function Description Ubuntu Equivalent Windows Update Located in the system tray, the The Software Update Notifier checks Windows Update program checks for software updates, and then notifies for and downloads software updates, you when updates are available. Click- and then notifies you that the ing the Update Manager icon pops up updates are ready to be installed a window from which you can down- at your command. load and install updates. Switch User This option is available when you The User Switcher is located on the left choose to log off from Windows. You side of the notification area. Click the can keep the login session of the username or real name, select another current user alive, while allowing user to log in to the system, and supply another user to log in to Windows. the correct password. The current user’s session will be locked, while a new session will be activated for the new logged-in user. It will take some time to get used to the look and feel of Ubuntu; everything will initially seem odd. You’ll find that the on-screen fonts look a little different from those in Windows, for example. The icons also won’t be the same as you’re used to in Windows. This can be a little disconcerting, but that feeling will quickly pass, and everything will become second nature. We’ll look at how you can personalize the desktop in Chapter 10. UBUNTU FOR MAC OS X USERS Migrating to Ubuntu from Mac OS X shouldn’t present too many surprises and, in some ways, Ubuntu has more in common with OS X than it does with Windows. After all, both Linux and OS X are versions of Unix. Here is a list of OS X functions alongside details of where they can be found within Ubuntu: • Finder (File Browsing): Finder under OS X offers access to files, applications, and much more and is represented on the Dock by the Mac smiley face icon. In terms of file browsing functionality, clicking Places ➤ Home under Ubuntu is all that’s needed for similar behavior. • Finder (Applications): The Applications option within Finder shows a list of all installed programs. Exactly the same thing can be found by clicking the Applications button under Ubuntu, although the programs are arranged into submenus to make finding what you’re looking for easier. • Finder (Network Locations): Clicking the Network button in Finder allows the user to browse the local area network or access remote file servers. This functionality can be found on the Places menu—click Places ➤ Network Servers to browse the local network and Places ➤ Connect to Server to access a remote server, such as FTP (this function also allows the user to connect to local servers by specifying their addresses).
- 146. 110 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME • Macintosh HD: Double-clicking this icon on the desktop allows the user to access the root of the Macintosh file system. To access the root file system under Ubuntu, click Places ➤ Computer, and then click the File System link in the left pane of the file browsing window. • Dock: There is no direct analogy to the Mac OS X Dock under Ubuntu, but the Quick Launch icons to the right of the Applications/Places/System menus offer quick access to the web browser, e-mail client, and help system. Additional programs can be added to the Quick Launch toolbar by clicking and dragging them from the Applications menu. The Window List controls the active window. • Trash: Located on the Dock, the Trash icon lets OS X users salvage deleted files. The same func- tionality is offered by the Ubuntu Trash icon, which is located at the bottom-right corner of the screen. • System Preferences: Located on the Dock and in the Applications menu, the System Preferences icon offers access to all of OS X’s configuration utilities. Similar functionality can be found on the System ➤ Preferences and System ➤ Administration menus. • Spaces (version 10.5 and above): Spaces allow you to unclutter your desktop by arranging your applications into separate workspaces. Similar functionality is available by using virtual desktops, which are located at the right side of the Window List. • Spotlight (version 10.4 and above): Spotlight allows users to search their hard disk for files. To access Ubuntu’s search function, click Places ➤ Search for Files. You can also click the Deskbar applet, located to the left of the notification area, or the Tracker search tool icon, located in the notification area, to search for files. Running Programs Starting a new program is easy. Just click the Applications menu, and then choose a program from the list, just as you would in Windows using the Start ➤ Programs menu. The menu, shown in Figure 7-6, is split into various subcategories of programs, such as office tools, graphics programs, and even games! If you want to start the web browser or e-mail client (arguably two of the most popular programs offered by Ubuntu), you can click their icons on the top panel bar, just to the right of the menus at the top of the screen (see Figure 7-6). At the top right of every program window under Ubuntu, you’ll see the familiar close, minimize, and maximize buttons, albeit with a slightly different look and feel than you’re used to. Clicking the close button will end each program, as in Windows.
- 147. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 111 Figure 7-6. The programs on the Applications menu are split into various categories. Working with Virtual Desktops Windows works on the premise of everything taking place on top of a single desktop. When you start a new program, it runs on top of the desktop, effectively covering up the desktop. In fact, all programs are run on this desktop, so it can get a bit confusing when you have more than a couple of programs running at the same time. Which Microsoft Word window contains the document you’re working on, rather than the one you’ve opened to take notes from? Where is that My Computer window you were using to copy files? Ubuntu overcomes this problem by having more than one desktop area. By using the Workspace Switcher tool, located at the bottom right of the desktop, you can switch between two virtual desktops. This is best explained by a demonstration. 1. Make sure that you’re currently on the first virtual desktop (click the leftmost square on the Workspace Switcher), and start up the web browser by clicking its icon at the top of the screen (the globe icon located to the right of the menus). 2. Click the second square on the Workspace Switcher. This will switch you to a clean desktop, where no programs are running—desktop number two. 3. Start up the file browser by selecting the Places ➤ Home menu option. A file browser window appears. 4. Click the first square in the Workspace Switcher again. You should switch back to the desktop that is running the web browser. 5. Click the second square, and you’ll switch back to the other desktop, which is running the file browser.
- 148. 112 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME ■Tip Right-clicking any of the program entries in the Window List will bring up a menu where you can move a program from one virtual desktop to another. Just select Move to Another Workspace. See how it works? You can create more than two virtual desktops—as many as 36, in fact! To set the number of workspaces, right-click the Workspace Switcher and select Pref- erences. In the window that appears, click the up/down arrow next to the Number of Workspaces entry, as shown in Figure 7-7. Figure 7-7. Four virtual desktops are set up by default, but you can have as many as 36. You can also rename each virtual desktop by double-clicking its entry in the list in the Workspace Names list. This allows you to be even more organized. For example, you might reserve desktop 1 for running Internet programs and give it a name that indicates this, such as Net Programs. You might then use desktop 2 to run office programs, giving it an appropriate title; use desktop 3 for file browsing; and so on. This name will appear whenever you right-click a program’s entry on the panel and attempt to move it to a different desktop. Additionally, these titles will appear whenever you right-click and choose to send each program window to a different desktop. ■Tip Putting your mouse over the Workspace Switcher and scrolling the mouse wheel switches between the various virtual desktops instantly. Alternatively, you can hold down Ctrl+Alt and press the left and right cursor keys to switch between virtual desktops.
- 149. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 113 The Workspace Switcher provides a way of organizing your programs and also reducing the clutter. You can experiment with virtual desktops to see if you want to organize your work this way. Some people swear by them. Experienced Ubuntu users may have in excess of ten virtual desktops, although clearly this will appeal only to organizational geniuses! Other users think multiple desktops are a waste of time. They’re certainly worth trying out to see if they suit the way you work. Using the Mouse As noted earlier, the mouse works mostly the same under Ubuntu as it does under Windows: a left-click selects things, and a right-click usually brings up a context menu. Try right- clicking various items, such as icons on the desktop or even the desktop itself. ■Tip Right-clicking a blank spot on the desktop and selecting Create Launcher lets you create shortcuts to applications. Clicking Create Folder lets you create new empty folders. You can use the mouse to drag icons on top of other icons. For example, you can drag a file onto a program icon in order to run it. You can also click and drag in certain areas to create an “elastic band” and, as in Windows, this lets you select more than one icon at once. You can resize windows using the mouse in much the same way as in Windows. Just click and drag the edges and corners of the windows. In addition, you can double-click the title bar to maximize and subsequently restore windows. Ubuntu also makes use of the third mouse button for middle-clicking. You might not think your mouse has one of these but, actually, if it’s relatively modern, it probably does. Such mice have a scroll wheel between the buttons, and this can act as a third button when pressed. In Ubuntu, the main use of the middle mouse button is in copying and pasting, as described in the next section. Middle-clicking also has a handful of other functions; for example, middle-clicking the title bar of any open window will switch to the window underneath. ■Tip If your mouse doesn’t have a scroll wheel, or if it has one that doesn’t click, you can still middle-click. Simply press the left and right mouse buttons at the same time. This emulates a middle-click, although it takes a little skill to get right. Generally speaking, you need to press one button a fraction of a second before you press the other button.
- 150. 114 CHAPTER 7 ■ BOOTING UBUN TU FOR THE FIRST TIME Cutting and Pasting Text Ubuntu offers two separate methods of cutting and pasting text. The first method is iden- tical to that under Windows. In a word processor or another application that deals with text, you can click and drag the mouse to highlight text, right-click anywhere on it, and then select to copy or cut the text. In many programs, you can also use the keyboard short- cuts of Ctrl+X to cut, Ctrl+C to copy, and Ctrl+V to paste. However, there’s a quicker method of copying and pasting. Simply click and drag to highlight some text, and then immediately click the middle mouse button where you want the text to appear. This will copy and paste the highlighted text automatically, as shown in Figure 7-8. Figure 7-8. Highlight the text, and then middle-click to paste it instantly. This special method of cutting and pasting bypasses the usual clipboard, so you should find that any text you’ve copied or cut previously should still be there. The downside is that it doesn’t work across all applications within Ubuntu, although it does work with the majority of them.
- 151. CH A PT ER 7 ■ BO O TI NG UBUN TU FO R T HE FI RST T IME 115 Summary This chapter covered booting into Ubuntu for the first time and discovering the desktop. We’ve looked at starting programs, working with virtual desktops, using the mouse on the Ubuntu desktop, and much more. You should have become confident in some basic Ubuntu skills and should now be ready to learn more! In the next chapter, we’ll look at getting your system up and running, focusing in particular on items of hardware that experience day-to-day use.
- 153. CHAPTER 8 ■■■ Getting Everything Up and Running T his chapter guides you through setting up all the essential components of your Ubuntu installation. This includes hardware configuration, as well as setting up e-mail. It covers the postinstallation steps necessary to get your system up and running efficiently. Like all modern Linux distributions, Ubuntu is practically automated when it comes to setting up key hardware and software components. Key software will work from the start, and most hardware will be automatically configured. However, you might need to tweak a few settings to make everything work correctly. Read on to learn more. Ubuntu Hardware Support The age-old criticism that the Linux operating system lags behind Windows in terms of hardware support is long dead. The majority of add-ins, such as digital cameras and printers, will all work with Ubuntu immediately, with little, if any, configuration. In fact, most underlying PC hardware is preconfigured during installation without your knowledge and without requiring further work. Both your graphics and sound cards should work without a hitch, for example. In addition, nearly all USB and FireWire devices you plug in after installation will be supported. Ubuntu doesn’t support a few hardware items. Generally, it’s a black or white situation: Ubuntu either works with a piece of hardware or it doesn’t. The types of hardware that Ubuntu doesn’t support tend to be esoteric devices that rely on custom software provided by the hardware manufacturer. It’s also sometimes the case that brand-new models of hardware won’t work with Ubuntu because support has yet to be added. However, as soon as a new piece of hardware comes out, work is usually under- taken to ensure that Linux is made compatible with it. This is especially true of hardware such as printers and scanners, and it’s one more reason why you should regularly update your system online, as explained in Chapter 9. 117
- 154. 118 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING ■Tip Before you buy a new piece of hardware, why not ask the salesperson if it runs under Linux? You can only hope that the salesperson knows or can find out for you. Also, compatibility with Linux is often listed on the hardware box or at the manufacturer’s web site (even if you sometimes need to search through the FAQ section to find out about it!). Unfortunately, unlike with Windows, it’s rare to find Linux drivers on the CD that comes with the hardware. Even if you do find a Linux driver supplied, chances are that it will work with only certain versions of Linux, such as Red Hat or SUSE Linux. There are also some drivers that are usable but imperfect or lack features that are available in their Windows counterparts. At the time of this writing, Ubuntu has yet to gain the kind of momentum where manufacturers specifically produce drivers for it, but this may change in the future. At least Dell, Everex, Asus, and Shuttle are now bundling Linux with their product offerings. Other OEMs may soon follow suit. ■Note It’s possible to use a program called alien to convert software installation packages designed for other distributions into Ubuntu installation files. Doing so isn’t very complicated but may not work very well with driver files because of the subtle differences in where system files are stored across different Linux distributions. You can find more information about alien at http://kitenet.net/~joey/code/alien/. It’s contained within the Ubuntu software repositories and can be downloaded using the Synaptic Package Manager, as explained Chapter 28. Proprietary vs. Open-Source Drivers As discussed earlier in this book, Linux is an open-source operating system. This means that the source code underlying Linux programs is available for study and even reuse. This is a good thing when it comes to hardware drivers, because bugs in the code can be spotted and repaired by anyone with an interest in doing so. If you consider that a bug in a graphics driver could mean your PC crashes every five minutes, the value of such an approach is abundantly clear. Unfortunately, some hardware manufacturers don’t like to disclose how their hard- ware works, because they want to protect their trade secrets. This makes it impossible for them to release open-source drivers, because such drivers would expose exactly how the hardware operates. Because such companies are aware of the fact that growing numbers of people use Linux, they release proprietary drivers, whose source code is not made publicly available. Aside from ethical issues surrounding not being able to study the source code, the biggest issue with proprietary drivers relates to bug fixing. To use a proprietary driver is to
- 155. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 119 be at the mercy of the hardware manufacturer’s own development and release schedule. If the driver has a serious bug, you’ll either have to work around it or put up with troubling issues until the manufacturer offers an update. A few years ago, a proprietary driver for a 3D graphics card stopped any computer it was installed on from going into hibernation mode (that is, suspending to disk). Those using the drivers had to wait months until the fix was released. Despite this and although the folks behind Ubuntu strongly support open-source soft- ware, they realize proprietary drivers need to be used in certain situations. For example, it’s impossible to use the 3D graphics elements of some graphics cards unless you have a proprietary driver, and this means that desktop visual effects will be unavailable to users who happen to have hardware that isn’t currently fully supported by open-source drivers. Because of this, Ubuntu automatically installs Wi-Fi proprietary drivers by default if no open-source alternative exists (or if the open-source version is not yet good enough). It also offers the opportunity to easily install some proprietary graphics card drivers if they provide more functionality than the open-source versions. ■Note Linux sees hardware in a technical way, rather than in the way humans do. If you attach something like a USB CD-R/RW drive, Linux will recognize the drive hardware and attempt to make it work. It won’t try to find a driver for that specific make and model of CD-R/RW drive. Thus, Linux is able to work with a wide range of hardware, because a lot of hardware is actually very similar on a technical level, despite the differ- ences in case design, model names, and even prices! WHAT HARDWARE WORKS? The question of what hardware works under Ubuntu is one that’s not easily answered. However, you can take a look at http://wiki.ubuntu.com/HardwareSupport to see if your hardware is listed. This is an informal list created by the Ubuntu community, and it’s not comprehensive (which is to say that there may be hardware that works fine that isn’t mentioned). Nor is the list guaranteed to be 100% accurate. But it’s certainly worth a look. A search engine like Google is your best friend if the Ubuntu hardware list doesn’t help. Simply search for the brand and model of your hardware and add “Ubuntu” to the search string. This should return results, usually from the Ubuntu forums (http://ubuntuforums.org) or blogs, written by those who have found a way to make that type of hardware work. Installing Device Manager When using Windows, you might have come across Device Manager, the handy tool that lists your PC’s hardware. Ubuntu offers a similar piece of software, as shown in Figure 8-1, but it isn’t installed by default.
- 156. 120 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING Figure 8-1. Ubuntu’s Device Manager program can display just about everything you need to know about attached hardware. After you can connect to the Internet (following the instructions in the “Getting Online” section of this chapter), you can install Device Manager using the Synaptic Package Manager (see the “Installing Software” section of this chapter), as follows: 1. Select System ➤ Administration ➤ Synaptic Package Manager. 2. Click the Search button on the toolbar, and then type gnome-device-manager in the Search field. Click the Search button. 3. Click the program’s entry in the list of results. Select to mark it for installation (don’t worry if a dialog box appears telling you additional software needs to be installed). 4. Click Apply on the toolbar. If your computer is not yet online, you’ll need to use a computer that is online (perhaps another computer, or Windows XP if you dual-boot) to download the software, and then copy it across to your Ubuntu computer for installation. To download the software, visit the following two addresses in your browser. You will be prompted to download a file after typing each address:
- 157. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 121 http://us.archive.ubuntu.com/ubuntu/pool/universe/g/gnome-device-manager/ gnome-device-manager_0.2-1_i386.deb http://us.archive.ubuntu.com/ubuntu/pool/universe/g/gnome-device-manager/ libgnome-device-manager0_0.2-1_i386.deb After the files are downloaded, copy them to the desktop on your Ubuntu machine, using a floppy disk or maybe a USB memory stick. Then open a command-prompt window on the Ubuntu computer by clicking Applications ➤ Accessories ➤ Terminal. In the terminal window, type the following, hitting Enter after each line: cd ~/Desktop sudo dpkg –i libgnome-device-manager0_0.2-1_i386.deb sudo dpkg –i gnome-device-manager_0.2-1_i386.deb After you’ve installed Device Manager, you can open it by selecting Applications ➤ System Tools ➤ Device Manager. You’ll need to click View ➤ Device Properties to ensure Device Manager adds the useful Properties tab. You should be aware of a few important differences between the Windows and Ubuntu versions of Device Manager. Though the aim of Ubuntu’s Device Manager is to manage hardware devices, the project is still in its infancy and can only provide hardware informa- tion as of the time of writing. On the other hand, Ubuntu’s list is far more comprehensive than that in Windows. In Ubuntu, Device Manager thoroughly probes the hardware to discover its capabilities. Perhaps the biggest difference, however, is that just because a piece of hardware is listed within Ubuntu’s Device Manager, it doesn’t mean that the hardware is configured to work with Ubuntu. In fact, it doesn’t even imply that the hardware will ever work under Ubuntu. Device Manager’s list is simply the result of probing devices attached to the various system buses (PCI, AGP, USB, and so on) and reporting the data. Nonetheless, Device Manager is the best starting place if you find that a certain piece of hardware isn’t working. If a piece of hardware is listed, then it proves, if nothing else, that the system recognizes that the hardware is attached. For example, later in this chapter, I’ll describe how you can use Device Manager to discover crucial details about wireless network devices, which we will then use to install drivers. How to Configure Ubuntu Unlike some versions of Linux, Ubuntu doesn’t rely on a centralized configuration soft- ware package. Instead it uses smaller programs to configure hardware. For example, to configure the network, you’ll use the NetworkManager program, and printers are configured using a separate printer configuration program. Because using some of the configuration software involves reconfiguring your entire system, doing so requires administrator priv- ileges. Therefore, you’ll be prompted for your login password each time you use some of
- 158. 122 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING the programs. In some cases, after you’ve made changes, you’ll need to click the Apply button to put the changes into effect. When you’ve finished configuration, simply close the program window by clicking the Close button. ■Note For five minutes after you enter your password, Ubuntu remembers it, so if you open the same appli- cation or another that requires administrator privileges within that amount of time, you won’t be prompted. Along with the individual configuration programs, you may also need to use the command line and install software to get your system up and running. We’ll take a quick look at how you can do both, before proceeding with the instructions for getting online. Using the Command Line For some configuration steps, we will ask you to open a terminal window. This will give you access to the command-line prompt, by which you can issue commands directly to Ubuntu. The Linux command-line prompt is a little like MS-DOS, which you might have used in the early days of Windows, except it’s a lot more powerful. As with DOS, you should press Enter after typing each command. Nearly all the commands affect your system, so they will require you to enter your password when prompted. We explain all about the command-line prompt in Part 4 of this book, beginning with Chapter 13, but for the moment, you should bear in mind the following points: • Check the command once you’ve typed it to ensure it reads as is printed on the page. Even a stray space in the command could cause havoc. • Don’t be tempted to experiment at the prompt at this stage of your Linux learning curve. This is especially true should you use administrator powers, which you’ll be doing for nearly all the commands. To open a terminal window, click Applications ➤ Accessories ➤ Terminal. After you’ve finished entering the commands and they have completed, simply close the program window. Installing Software Throughout this chapter and in other chapters in this book, we might ask that you install software packages using Ubuntu’s software configuration tool, the Synaptic Package Manager. Some software packages might be installed from the DVD-ROM disc, so you’ll need to keep that handy, but the majority will be automatically downloaded from online repositories once you’ve configured your computer to go online.
- 159. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 123 We explain all about software installation in Chapter 28 of this book, but here’s a brief primer on what to do: • To open the Synaptic Package Manager, click System ➤ Administration ➤ Synaptic Package Manager. Because you’re reconfiguring your system, you’ll need to enter your login password when prompted. • Every time you use the Synaptic Package Manager, you should click the Reload button, at the left side of the toolbar running across the top of the screen. This will grab the most up-to-date list of software from the online servers. • To search for software, click the Search button on the toolbar, and type the name into the Search field of the dialog box. Then click the dialog box’s Search button. • To install a software package, click the check box alongside it in the list of results, and click Mark for Installation on the menu that pops up. Sometimes you might be informed that extra software packages need to be installed. This is fine, and they will automatically be added to the list. • When you’ve finished making your choices, click the Apply button on the main toolbar. Click Apply once more in the dialog box that appears to confirm your choices. • When installation has finished, click the Close button in the dialog box, and close the Synaptic Package Manager. GETTING HELP FROM THE COMMUNITY Configuring hardware is one area where the value of the Ubuntu community becomes very apparent. If you run into a problem, it’s unlikely your situation will be unique. Others will probably have encountered the same problem and may have figured out a solution. If so, they may have posted it online. If nothing else, you might find sufficient clues to be able to solve the problem by yourself. Sharing information in this way is part of the spirit of Ubuntu and also Linux. We’ve tried to provide complete guides to most hardware configuration in this chapter, but if you run into problems, your first port of call should be the Ubuntu forums, at www.ubuntuforums.org. This is the central meeting place for the Ubuntu community. You can search through existing forum postings or start your own thread asking for help. We explain a little more about the protocols of asking for help in Appendix C of this book. Also worth visiting in times of trouble is the community-written wiki, which can be found at https://help.ubuntu.com/community. Here, you’ll find a range of guides to help configure various aspects of Ubuntu. A wiki is a form of web site that anyone can edit or contribute to. The idea is that it’s constructed by its readers.
- 160. 124 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING We also recommend taking a look at the Ubuntu Guide, at http://ubuntuguide.org, which is also community-written. The Ubuntu Guide can be very concise, and often expects a relatively high degree of technical knowledge, but it is also very comprehensive. Finally, don’t forget that you’re a member of the community, too. If you encounter and subsequently solve a configuration problem, share the solution with others. You can do this by editing the Ubuntu wiki or posting to the forums. Getting Online Getting online is vital in our modern Internet age, and Ubuntu caters to all the standard ways of doing so. Linux was built from the ground up to be an online operating system and is based on Unix, which pioneered the concept of networking computers together to share data back in the 1970s. However, none of this is to say that getting online with Ubuntu is difficult! In fact, it’s very easy. Regardless of whether you use a modem, standard Ethernet network device, or wireless network device, the same program, NetworkManager, is used to configure your network settings under Ubuntu. Support for many makes and models of equipment is built in, so in most cases, all you need to do is enter a few configuration details. ■Note Linux actually runs around 60% of the computers that make the Internet work! Whenever you visit a web site, there’s a strong chance that it’s run using Linux. As your Linux skills increase, you’ll eventually get to a stage where you, too, can run your own Internet servers. It sounds difficult, but can be quite easy. Using NetworkManager NetworkManager lets users easily manage both wireless (also known as Wi-Fi) and wired connections, such as Ethernet connections. It sits in the notification area at the top right of the desktop (look for the icon of two screens inset against each other) and automatically detects any wireless networks that are in range, as well as if you’re currently plugged into a wired network. Clicking the NetworkManager icon will show a list of networks that have been detected. By selecting the entry in the list, you can then connect to the network, and you’ll be prompted to configure WEP/WPA protection, if applicable.
- 161. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 125 ■Caution On our test system, which attempted to connect to a 3Com ADSL Wireless 11g Firewall Router, we were prompted for the wrong kind of wireless protection (we were asked for a 128-bit WEP key rather than a 64-bit key). In other words, it pays to check that you’re being prompted for the right thing, and to select the correct option if you’re not. Failure to do so might result in frustration! Following this, the NetworkManager icon will display the signal strength of the connection for as long as you’re connected. By clicking it, you’ll be able to see at a glance what network you’re connected to. If you want to switch networks, just click the NetworkManager icon and select a different network in the list. ■Tip By right-clicking the NetworkManager icon, you can opt to completely disable your network hardware if you wish. NetworkManager settings persist across reboots, provided the network that was last configured is in range. This means that NetworkManager is ideal for all kinds of wireless network users, from those who frequently switch between different networks (that is, mobile workers) to those who just use a single wireless network connection, such as that provided by a wireless network broadband router in a home/small office environment. NetworkManager will also let you switch to a wired (Ethernet) connection, if and when you attach one to your computer. NetworkManager works in two modes: roaming and manual. Roaming mode is the default and works as we’ve just described: NetworkManager will automatically detect networks and the type of connection. In manual mode, you can opt to manually supply details, such as the IP address and gateway, or the name of the wireless base station, which might be necessary if your base station doesn’t broadcast its name of if you need to connect to a specialized setup. However, for most users, roaming mode will suffice, and you won’t need to bother with manual mode. Configuring an Ethernet Network Device Ethernet is one of the oldest and most established network technologies. When we talk of Ethernet, we refer to wired networks—all the computers on the network are connected by cabling to a central hub or router. (The other form of networking technology, which works without wires, is covered in the next section.)
- 162. 126 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING You might go online via Ethernet in a variety of situations. If you have DSL or cable broadband service at your home or workplace, for example, you might use a DSL router that has a number of Ethernet ports. Your computer will then connect to this router via an Ethernet cable. If you’re running Ubuntu on a PC in an office environment, it’s likely that you will connect to the local area network using Ethernet. This lets your computer communicate with other computers, as well as with shared printers. In some offices in which an Internet connection is provided, this connection might also allow you to go online. In most cases, NetworkManager’s roaming mode will sense a wired Ethernet connec- tion and automatically connect using the Dynamic Host Control Protocol (DHCP). This means that your computer receives its IP address, gateway, subnet mask, and Domain Name System (DNS) addresses automatically. All routers manufactured today are set up to automatically use DHCP out of the box. ■Tip If a DHCP server is not available, Ubuntu will attempt to set up a network automatically using the Zeroconf (or Zero Configuration Networking) system, just like Microsoft Windows systems. (Microsoft refers to this as Automatic Private IP Addressing, but it’s also known as link-local.) In other words, if a bunch of computers plug into a hub or router on an ad hoc basis, without being configured and without a DHCP server operating, they will be able to network with each other. To make this work, each computer randomly assigns itself a unique IP address that starts with 169.254 with a subnet mask of 255.255.0.0. If you need to manually specify network details such as IP and router addresses, perhaps because you work in an office environment with nonstandard systems, start by speaking to your system administrator or technical support person to determine the settings you need. Ask the administrator for your IP address, DNS server addresses (there are usually two or three of these), your subnet mask, and the router address (sometimes referred to as the gateway address). The settings you will get from your system administrator will usually be in the form of a series of four numbers separated by dots, something like 192.168.0.233. After you have this information, follow these steps: 1. Click the NetworkManager icon in the notification area, and then select Manual Configuration. 2. Click the Unlock button in the dialog box that appears. Supply your password when prompted, and then click the Authenticate button.
- 163. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 127 3. Find your network device in the list. It should be referred to as Wired Connection. Click its entry, and then click Properties. 4. In the dialog box that appears, uncheck the Enable Roaming Mode check box. This overrides NetworkManager’s capability to automatically manage the device and allows you to manually configure the device. In the Configuration drop-down list, make sure Static IP Address is highlighted. In the IP Address, Subnet Mask, and Gateway Address text boxes, fill in the relevant details. Figure 8-2 shows an example of these settings. Click OK after filling in the information. Figure 8-2. Ubuntu will automatically work with DHCP networks, or you can define a static IP address. 5. Click the DNS tab in the Network Settings dialog box. 6. Click the Add button, and then type the first DNS address. Press Enter when you’ve finished. Click Add again, and enter the second DNS address, if you have been given one, and then enter a third if you were given one.
- 164. 128 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING ■Tip If you’re using a static IP address with a router, such as that provided by a DSL modem, the DNS address will probably be the same as the router/gateway address. 7. Click the Close button. Your network connection should now work. If you find it isn’t working, try rebooting. However, if your system administrator mentioned that a proxy must also be configured, you’ll also need to follow the instructions in the “Working with a Proxy Server” section later in this chapter. Connecting to a Wireless Network A wireless (Wi-Fi) network is, as its name suggests, a network that does away with cabling and uses radio frequencies to communicate. It’s more common for notebooks and hand- held computers to use wireless connections, but some desktop computers also do. Indeed, it’s increasingly the case that many workplaces are switching to wireless networking, eschewing old-fashioned, cable-based networking. ■Note Slowly but surely. Wi-Fi is replacing wired Ethernet networks, but there are many situations in which Wi-Fi networks are impractical or simply undesirable. For example, the metal infrastructure in some buildings means the signal becomes unreliable. Wi-Fi is also considered too insecure for some companies. The Wi-Fi signal often spreads to the street outside the building. Although such transmissions are nearly always secured, Wi-Fi security implementations have been broken, although WPA2 is considered secure right now. Ethernet might be considered old technology, but trying to steal data from physical cables is an order of magnitude more difficult, to the point of being practically impossible. Notebooks and PDAs typically use built-in wireless network devices, with an invisible antenna built into the case. However, some notebooks might use PCMCIA cards, which will have an external square antenna, and some desktop computers might use PCI-based wireless cards, which have external rubber/plastic antennas, in the style of old cell phones. Ubuntu includes support for most wireless network devices. However, it’s possible to use Windows wireless network device drivers for unsupported hardware. Also, sometimes Ubuntu appears to support a wireless network device, in that it identifies it and lets you configure it, but you might find that it simply doesn’t work (or works very badly, perhaps with an intermittent connection). In this situation, you can also try installing Windows drivers. See the “Installing Windows Wireless Network Device Drivers” section later in this chapter for details.
- 165. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 129 ■Note Ubuntu is rare in the Linux world in that it uses some proprietary (closed source) wireless device drivers by default. Ubuntu is, after all, an open-source operating system and is committed to the goals of open-source software. The use of proprietary drivers is a necessary evil because not all devices have open- source drivers right now, and not all open-source drivers support all the functions you might be used to (typically they might not support the WPA functionality of your Wi-Fi device, for example). The use of proprietary drivers is only a stopgap measure, and it’s hoped that open-source driver development will catch up, making propri- etary drivers redundant. Connecting to a wireless network device is easy with NetworkManager. Just click the NetworkManager icon, and you will see the available Wi-Fi networks in the Wireless Network list. Networks protected with WEP/WPA will have an icon of a padlock. Those that are “open” will not have this icon. You might see many Wi-Fi networks listed, depending on your location. The wireless base stations are identified by their Service Set Identifier (SSID) or sometimes ESSID, with E standing for Extended. If the SSID you would like to connect to is not listed by NetworkManager, it could mean that your wireless base station isn’t set to broadcast its SSID or, worse, Ubuntu’s Wi-Fi drivers aren’t functioning correctly. If it’s the former, all you need to do is right-click the NetworkManager icon and select Connect to Other Wireless Network. Then, in the new dialog box, type the SSID under Network Name, set Wireless Security to none or the appropriate security type, fill in the other information depending on the type of wireless security you selected, and click Connect. If it’s the latter, you may need to use a Windows driver, as described in the next section. ■Tip If you are not offered any wireless networks at all, ensure the wireless hardware is switched on. Some notebooks have a keyboard combination to turn it off to save battery power. Additionally, try right-clicking the NetworkManager icon and ensuring that the wireless networking hardware is activated. To connect to a Wi-Fi network, select the wireless base station you wish to connect to in the list. If it isn’t protected by WEP/WPA, you will be connected to it automatically. If the Wi-Fi network you wish to connect to is protected with WEP or WPA, a dialog box will appear, prompting you for the password/passphrase, as shown in Figure 8-3. In the Wireless Security field, make sure the correct type of security for the wireless network is selected—don’t assume it’s automatically correct! By default, the password/passphrase is obfuscated by circle characters so that anyone looking over your shoulder can’t see what you’re typing. If it helps (and if your shoulder is clear!), check the Show Password box. This can really handy when you’re typing a particularly long passphrase.
- 166. 130 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING ■Note WEP keys come in either hexadecimal (hex) or plain text (passphrase) varieties. Hex keys look similar to this in their 128-bit form: CB4C4189B1861E19BC9A9BDA59. In their 64-bit form, they will be shorter and may look similar to 4D9ED51E23. A passphrase will take the form of a single short sentence. In home and office environments, WPA networks are usually protected with passphrases. In larger corporate or academic environments, you might find the network is protected with a WPA certificate. Figure 8-3. Ubuntu is able to join WPA-protected wireless networks. When you’re finished, click the Connect button. You should see the NetworkManager icon start to animate as the program attempts to connect and find an IP address. After a few seconds, when the animation finishes and the icon switches to display signal bars, you should find yourself online. If your computer doesn’t seem to connect, try rebooting. If the hardware doesn’t work after this, it might be that the drivers Ubuntu installed by default are incompatible with your network device. In this case, you can try using a Windows wireless network device driver, as described in the next section. Should you find yourself in the unusual situation of needing to specify the IP address, subnet mask, and gateway for a wireless connection, you can do so using the manual configuration mode of NetworkManager, as outlined in the “Configuring an Ethernet Network Device” section earlier in this chapter. Simply follow the instructions in that section, but select the Wireless Connection entry in the list, rather than Wired Connection. In the dialog box that appears, you’ll see additional areas where you can enter your SSID and WEP/WPA protection details.
- 167. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 131 WEP VS. WPA Some wireless networks are protected using either the Wired Equivalency Privacy (WEP) or Wi-Fi Protected Access (WPA) systems. WPA is effectively an updated version of WEP and offers stronger protection. There are actually two versions of WPA: WPA and WPA2. WPA2 is newer and corrected several security flaws in WPA. Both work in roughly the same way. WEP and WPA encrypt the data being transmitted on the network, the idea being that it cannot be stolen by crackers with special equipment. Also, people can’t join the wireless network unless they know the encryption key, which is basically an access code. This prevents unauthorized people from accessing the network. Of the two, you should ideally configure your Wi-Fi base station to use WPA, because, sadly, WEP can be compromised within five minutes using easily available software. However, the situation isn’t quite so clear-cut for some Ubuntu users. Not all of Ubuntu’s built-in Wi-Fi drivers support WPA. Some might claim to support it, but you might find they don’t work reliably. Unfortunately, the only way you will be able to find out if this is the case for you is to try to configure your network device and see what happens. If you fall into the camp of not having good WPA support on your Ubuntu PC (and only a small percentage of users will), you might find WEP is your only reliable option, and you might therefore need to reconfigure your base station to use it. Our experience has shown that WEP has a very high success rate under Ubuntu. However, sometimes 128-bit WEP won’t work on some troublesome Wi-Fi devices, and you might need to switch your network to 64-bit WEP instead. WEP is a compromise in security terms, but try to remain realistic when considering your imme- diate environment. If your wireless network is within your home, is it likely that the couple living next door will have the know-how to crack a wireless network connection? Are they likely to want to do so? On the other hand, if you live in an apartment block with several other computer-literate people, or if you work in an office, the risk might be considerably higher. Some people suggest that breaking into wireless networks is almost a sport for certain individuals. If this is the case, and you feel you simply can’t use WEP, consider installing Windows drivers using NdisWrapper, as explained in this chapter. But whatever the case, bear in mind that confidential Internet connections, such as those for banking and shopping sites, are independently protected using a separate technology. See the sidebar titled “Secure Connections on the Net” later in this chapter for details. Installing Windows Wireless Network Device Drivers NdisWrapper is effectively an open-source driver (technically described as a kernel module) that allows Linux to use standard Windows XP drivers for wireless network devices. You might describe NdisWrapper as being a translation layer between the Linux kernel and the Windows drivers, which can be installed using NdisWrapper’s configuration tools.
- 168. 132 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING You should only use NdisWrapper in one of two situations: • Your wireless network hardware simply isn’t recognized by Ubuntu, which is to say, all you see when you click the NetworkManager icon is a Manual Configuration option; you don’t see any wireless networks listed. Of course, you should first ensure that the wireless hardware in your computer is actually switched on—some note- books offer the facility to deactivate it to save battery life. • Your network hardware is recognized by Ubuntu but fails to work correctly or adequately when you configure it. Perhaps it is unable to associate with wireless base stations, for example, or maybe you can’t connect to WPA-enabled base stations and consider WEP too insecure for your surroundings. If this is the case, in addition to installing NdisWrapper, you’ll need to undertake an additional step in order to blacklist the existing Ubuntu driver. Using NdisWrapper is relatively simple and just a handful of commands are required. However, getting hold of the necessary Windows driver files is harder work because, unfortunately, NdisWrapper isn’t designed to work with the usual method of driver distri- bution: .exe files. Instead, NdisWrapper needs the specific .inf and .sys files that constitute the driver—effectively, the Windows system files. These are contained within the .exe file and must be manually extracted. ■Note Sometimes drivers are distributed as .zip files, in which case the relevant files are easy to get at. Keep your fingers crossed that this will be the case for your particular hardware! NdisWrapper is far from perfect. Not all wireless devices have been proven to work with it, and it’s not necessarily the case that a driver available for Windows will work under Linux. Sometimes trial and error is required. Annoyingly, Windows drivers some- times appear to work but then prove unreliable. Some might stop working. Some might even crash your system. The best plan is simply to give it a try. ■Tip NdisWrapper gets better and better with every new release. This is why it’s a good idea to update your system on a regular basis, as described in Chapter 9. In the instructions in this section, we explain how to make an Atheros AR5008 wireless network device that’s built into an Apple MacBook work under Ubuntu using NdisWrapper. The instructions remain essentially the same for all types of wireless network hardware. However, some specific details, such as download addresses, will obviously differ.
- 169. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 133 First, you’ll need to install the NdisWrapper software, and then you can install the necessary Windows drivers. These steps will make your wireless network device available under Ubuntu. Then you can follow the instructions in the previous section to connect to that wireless network. Installing the NdisWrapper Configuration Tools NdisWrapper consists of two components: a kernel module and configuration tools. The kernel module comes as part of the default kernel package, so is installed by default, but you will need to download and install the configuration tools manually. To do so, using another computer that is already online (or by switching to Windows XP if you dual-boot), visit the following addresses using a web browser: http://us.archive.ubuntu.com/ubuntu/pool/main/n/ndiswrapper/ ndiswrapper-utils-1.9_1.50-1ubuntu1_i386.deb http://us.archive.ubuntu.com/ubuntu/pool/main/n/ndiswrapper/ ndiswrapper-common_1.50-1ubuntu1_all.deb http://us.archive.ubuntu.com/ubuntu/pool/main/n/ndisgtk/ndisgtk_0.8.3-1_i386.deb You’ll be prompted to download these files. Save the files to a floppy disk or USB memory stick, or burn them to a blank CD-R/RW disk. Then, on the Ubuntu computer, copy the downloaded files to the desktop. Next, open a terminal window (Applications ➤ Accessories ➤ Terminal), and type the following, which will install the new software: cd ~/Desktop sudo dpkg -i ndis* You’ll need to enter your password when prompted. When the commands have finished, and you see the command prompt again, close the terminal window. Installing the Windows XP Drivers Once the NdisWrapper configuration software is installed, you can install the Windows XP wireless network device drivers. There are several parts to the procedure: • Identify the wireless network hardware, and then source the appropriate Windows driver. • Extract the necessary .sys and .inf files from the driver archive (and possibly .bin files, although this is rare). • You may need to blacklist the built-in Ubuntu driver, so that NdisWrapper can associate with the hardware. • Use the NdisWrapper configuration tool to install the Windows driver.
- 170. 134 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING These steps are covered in the following sections. You will need another computer that’s already online to download some files and check the NdisWrapper web site for information. If your computer dual-boots, you can use your Windows setup to do this. Identifying Your Wireless Network Hardware and Sourcing Drivers To identify the wireless network hardware for use with NdisWrapper, it’s necessary to discover two pieces of information: the make and model of the hardware and the PCI ID number. The former is the make and model of the hardware, as identified by Ubuntu as a result of system probing, rather than what’s quoted on the packaging for the wireless network device or in its documentation. These details discovered by Ubuntu will usually relate to the manufacturer of the underlying components, rather than the company that manufactured the hardware. The PCI ID is two four-digit hexadecimal numbers used by your computer to identify the device internally. The same PCI ID numbering system is used by both Windows and Ubuntu, which is why it’s so useful in this instance. You can find both the PCI ID and the make/model information using the Device Manager tool. Follow the instructions in the “Installing Device Manager” section earlier in this chapter if you haven’t already installed this program. Then follow these steps: 1. Select Applications ➤ System Tools ➤ Device Manager. In the left column, find the entry that reads Network Controller, Networking Wireless Control Interface, or WLAN Interface. You might also look for USB Interface, PCI Bridge, or 802.11 to exhaust your search. Then look at the corresponding summary in the right column, where you’ll find the make and model of the hardware listed under the Vendor and Model headings. If no useful details are listed, you might need to click the parent entry in the list. On one test system, we found the WLAN Interface entry, but saw the make and model details only after we clicked the Ethernet Controller parent entry in the list on the left. 2. Write down the make and model shown in Device Manager. For example, on a test notebook containing an Atheros wireless network device, the make and model read “AR5418 802.11abgn Wireless PCI Express Adapter.” Remember that these details don’t relate to those listed in the instruction manual or computer packaging (our notebook’s specification lists the hardware simply as “Built-in AirPort Extreme Wi-Fi”). This is because Ubuntu is identifying the hardware generically, reading information from its component hardware. 3. Click the Properties tab of Device Manager (if this isn’t visible, click View ➤ Device Properties) and look through the information there for a line that begins info.udi. Look at the end of the line, and make a note of the two sets of characters that are sepa- rated by an underscore and preceded by pci_. Look at Figure 8-4 for an example taken from our test machine. Yours may differ, but the line should always end with pci_ and then the digits. If it doesn’t, you have selected the wrong entry in the list of devices on the left. Try examining a different entry, such as the parent of the entry in the list.
- 171. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 135 Figure 8-4. Find the PCI ID of your wireless network hardware by looking at the end of the info.udi line. 4. Write down the characters following pci_ at the end of the info.udi line. Written alongside each other, the two sets of digits that are separated by an underscore form the all-important PCI ID number. In written form, they’re usually separated by a colon. If either of the sets of letters or numbers is less than four characters long, simply add zeros before them in order to make four characters. For example, in Figure 8-4, the end of the info.udi line reads 168c_24. We add two zeros before 24, making a complete PCI ID of 168c:0024. On another test PC, the end of the line read 168c_13. Adding two zeros before the 13 gives a PCI ID of 168c:0013. 5. Using another computer that’s able to go online, visit http://ndiswrapper. sourceforge.net/. On the main menu, click Documents/Wiki, and then click the List of Cards Known to Work link. This is a community-generated listing of the wireless network devices that have been proven to work with NdisWrapper.
- 172. 136 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING ■Tip The URL in step 5 was correct as this book went to press. If you find it no longer accurate, search Google using “NdisWrapper list” as a search term. 6. The “known to work” cards are grouped in alphabetical order. Select the appro- priate list based on the card manufacturer’s name. (Remember to use the name you discovered using Device Manager in steps 1 and 2, and not the official name in the computer’s manual or packaging.) 7. Using the search function of your browser (Ctrl+F within Firefox), look for the PCI ID number you noted earlier, in the format described in step 4. For the example in Figure 8-4, we would search for 168c:0024. In the list, look to match the following things, presented in order of importance: • The PCI ID • The model name of the wireless hardware, as reported by Device Manager (listed on the Summary tab) • The manufacturer and model of the notebook, as mentioned on its case or within its documentation It’s likely many entries in the list may match your PCI ID, so search until you find the one that best matches the model of the hardware. If there are still many matches, search until you find an entry that matches the manufacturer and model of the notebook. You might not be lucky enough to find an exact match for the notebook manufacturer and model, however, and you might need to select the most likely choice. Use your common sense and judgment. If your notebook is manufactured by Asus, for example, but you can’t find the drivers for the exact model, then choose drivers for another Asus model. ■Caution Watch out for any mention of x86_64 in the description of the driver file. This indicates the entry in the list relates to 64-bit Linux. The version of Ubuntu supplied with this book is 32-bit. If you encounter an entry relating to x86_64, keep searching. 8. Look within the entry in the list for a direct link to the driver file. Sometimes this isn’t given, and a manufacturer web site address will be mentioned, which you can visit and navigate through to the driver download section (usually under the Support section within the web site). Download the Windows XP driver release.
- 173. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 137 Extracting the Driver Components Once the drivers are downloaded, you’ll need to extract the .sys and .inf file relevant to your wireless network hardware. These are all that NdisWrapper needs, and the rest of the driver files can be discarded. However, extracting the files can be hard to do, because often they’re contained within an .exe file. (Most driver .exe files are actually self-extracting archive files.) Additionally, the driver file might contain drivers for several different models of hardware, and it’s necessary to identify the particular driver .inf file relevant to your wireless network device. If the driver you’ve downloaded is a .zip file, then your task will probably be much easier. Simply double-click the downloaded .zip file to look within it for the directory containing the actual driver files. If the driver is an .exe file, it’s necessary to extract the files within it. With any luck you might be able to do this using an archive tool like WinZip (www.winzip.com), assuming that you’ve downloaded the file using Windows. Simply open the archive using the File ➤ Open menu option within WinZip. You may have to select All Files from the File Type drop-down list in order for the .exe file to show up in the file list. However, if you’re using Windows, we recommend an open-source and free of charge program called Universal Extractor, which can be downloaded from www.legroom.net/software/uniextract. This program can extract files from virtually every kind of archive, including most driver instal- lation files. Once it is installed, simply right-click the installation .exe file, and select UniExtract to Subdir. This will then create a new folder in the same directory as the down- loaded file, containing the contents of the installer file. Once you’ve extracted the files within your downloaded driver file, look for the files you need. It’s likely those driver files will be contained in a folder called something like Driver or named after the operating system, like Win_XP. Once you’ve found the relevant directory, look for .inf, .sys, and .bin files (although you may not find any .bin files; they’re used in only a handful of drivers). You can ignore any other files, such as .cab and .cat files. Click and drag the .inf, .sys, and .bin files to a separate folder. The task now is to find the .inf file for your hardware. If there’s more than one, you’ll need to search each until you find the one you need. You need to look for text that corre- sponds to the PCI ID you noted earlier. Open the first .inf file in a text editor (double- clicking will do this in Windows), and using the search tool, search for the first part of the PCI ID, as discovered earlier. For the example in Figure 8-4, we would search for 168c. If you don’t find it within the file, move on to the next .inf file, and search again. When you get a search match, it will probably be in a long line of text and to the right of the text VEN_. Then look further along that line to see if the second part of the PCI ID is mentioned, prob- ably to the right of text that reads DEV_. In the case of the driver file we downloaded for the example, the entire line within the .inf file read as follows (the two component PCI ID parts are shown in bold): %ATHER.DeviceDesc.0023% = ATHER_DEV_0023.ndi, PCIVEN_168C&DEV_0024
- 174. 138 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING If you find both component parts of the PCI ID in the line, as in this example, then you’ve found the .inf file you need. (In fact, you’ll probably find many lines matching what you need, which is fine.) You must now transfer the .inf file, along with the .sys and .bin files (if any .bin files were included with the driver) to the computer on which you want to install the drivers. This can be done by putting them onto a floppy disk, by burning them onto CD, or by using a USB memory stick. Create a new directory called driver on the desktop and save them there. Your procedure from this point depends on if Ubuntu recognized your wireless networking device when you first booted but was unable to make it work correctly. If it did then you will need to blacklist the built-in driver, so that NdisWrapper can associate with the hardware. If the device wasn’t recognized, you can skip straight to the “Using NdisWrapper to Install the Drivers” section. Blacklisting Existing Drivers To blacklist the existing built-in driver that didn’t work with your wireless device, you need to find out the name of the kernel module and then add it to the /etc/modprobe.d/ blacklist file. Here are the steps: 1. Open Device Manager (System ➤ Administration ➤ Device Manager), and select the entry in the list for your wireless network device. This is the one you discovered in steps 1 and 2 earlier, in the “Identifying Your Wireless Network Hardware and Sourcing Drivers” section. 2. Click the Properties tab (if this isn’t visible, click View ➤ Device Properties), and look for the line that begins info.linux.driver. Then look in the value column, and make a note of what’s there. For example, on our test notebooks, the value column read rt2500usb. Close Device Manager. 3. Open a terminal window (Applications ➤ Accessories ➤ Terminal). Type the following to open the blacklist configuration file in the Gedit text editor: gksu gedit /etc/modprobe.d/blacklist 4. At the bottom of the file, type the following on a new line: blacklist modulename Replace modulename with the name of the module you discovered earlier. For example, on our test system, we typed the following (as shown in Figure 8-5): blacklist rt2500usb
- 175. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 139 Figure 8-5. To stop Ubuntu from loading its own drivers, you’ll need to blacklist the module. 5. Save the file, and then reboot your computer. You should now find that the wireless network device is no longer visible when you click the NetworkManager icon, and all you see is a Manual Configuration option. This is good, because it means the hardware no longer has a driver attached, and you can now tell NdisWrapper to use the hardware. Using NdisWrapper to Install the Drivers On the Ubuntu computer on which you wish to install the drivers, you should now have the .inf file from the previous steps, plus the .sys and possibly .bin files that constitute the driver. You should have copied these files from the removable storage device into a new folder on your desktop named driver. ■Note If you’ve used a USB memory stick to transfer the files, it should appear automatically on the desktop as soon as it’s inserted. When you’ve finished with it, right-click the desktop icon, and select Unmount. You must do this before physically removing any kind of USB memory device, as explained later in this chapter.
- 176. 140 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING To install the driver using NdisWrapper, follow these instructions: 1. Click System ➤ Administration ➤ Windows Wireless Drivers. Enter your password when prompted. 2. Click the Install New Driver button. 3. The Install Driver dialog box appears, prompting you to select the .inf file for your wireless device. Click the Location drop-down list to open a file browsing dialog box. 4. Navigate to the .inf file you copied to your system, which you have placed in the driver folder on your desktop. Double-click the desktop folder, and then double- click the driver folder listed in the right column. Select the .inf file you copied in the driver folder and then click the Open button. 5. Back in the Install Driver dialog box, click the Install button. 6. At this point, you should see the driver listed at the left column of the Wireless Network Drivers dialog box. It specifies the name of the driver installed and whether the hardware is installed. If it says the hardware isn’t installed, you’ve probably selected the wrong .inf file, or might be using the wrong driver file. Return to the previous sections and try to get an alternative Windows driver. 7. No reboot is necessary and your wireless network card should work immediately. To test if the driver works, click the NetworkManager icon and see if there are wireless networks listed. If it works, click Close to exit the Wireless Network Drivers dialog box. Following this, you should find the network device is available for configuration. Follow the earlier instructions for connecting to a wireless network. Removing NdisWrapper Drivers As mentioned earlier, although NdisWrapper can solve a lot of headaches with nonworking wireless hardware, it isn’t perfect. You might find that the Windows driver you install simply doesn’t work. In such a case, you can download a different version of the driver and try again. But first you’ll need to remove the existing driver. Select Click System ➤ Administration ➤ Windows Wireless Drivers and enter your password when prompted. In the Windows Network Drivers dialog box, select the driver you want to remove in the left column and click Remove Driver. Click Yes when prompted to confirm the removal. Click Close to exit the tool.
- 177. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 141 SECURE CONNECTIONS ON THE NET For home users, the use of online banking services involves the transfer of confidential data. So is this a good reason to use the strongest form of wireless network encryption with your broadband router? No it isn’t. In fact, it makes no difference. This is because the transfer of confidential or financial data across the Web—to and from online banking sites, for example—is nearly always protected by Secure Socket Layer (SSL) HTTP. This works across any type of network connection, including wireless and Ethernet, regardless of whether the connection has its own protection. You can tell you’re browsing a site that’s using SSL because the address will begin with https. Additionally, most browsers display a padlock symbol at the bottom of the screen (the Firefox browser will also turn the background of the address bar yellow). Accessing such sites should be safe, even if your wireless network connection is “open,” which is to say it isn’t protected with either WEP or WPA. Similarly, although online shopping sites might not use SSL while you’re browsing, when it’s time to pay, they always use SSL. This ensures your credit card details are encrypted. If the store doesn’t adopt an https:// address when you click to visit the virtual checkout, you shouldn’t shop there! So do you even need WEP or WPA protection if you simply use your wireless connection to browse the Internet? Yes. In addition to the risk of unauthorized users hopping onto your connection if it isn’t protected, some web mail services transfer your username and password “in the clear,” which is to say without using SSL. This means your information could be picked up by an eavesdropper. In the case of Hotmail and Yahoo Mail, you can select secure login, but it isn’t activated by default. Google Mail appears to use SSL all the time for login, but after this, your e-mail messages are transmitted across the Internet in the clear and, in theory, anyone, anywhere can eavesdrop. Using Dial-Up Telephone Modems In our world of high-speed broadband connections, we sometimes forget that a sizable minority of people use telephone dial-up to connect to an ISP. For such people, Ubuntu offers good and bad news. The good news is that the Ubuntu software repository includes fuss-free software that can be used to configure connections and dial-up with the click of a mouse. The bad news is that, taken as a whole, Ubuntu support for dial-up modems isn’t very strong. If your modem is external and connects to the serial port, then there’s a very good chance Ubuntu will work fine with it. However, if the modem connects to the USB port, is built into your computer, or is provided on a PCMCIA card, then Ubuntu support is less certain. This is because many modems need additional and specialized configuration. See the sidebar titled “Winmodems.” There’s no quick way to find out if your modem is supported, other than to follow the instructions in this section and attempt to use it. To follow the instructions, you’ll need access to a computer that’s already online to download a software package. If you dual- boot with Windows, you can use it to download the software.
- 178. 142 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING To configure your modem once the software is downloaded, you will need three pieces of information: the telephone number you should use to dial up, your username, and your password for your ISP (not your Ubuntu login username and password!). WINMODEMS Some years ago, hardware manufacturers realized that they could produce dial-up modems more cheaply if they shifted the hard work of decoding the signal onto the computer’s operating system. With the work off-loaded, the modem’s circuitry could contain fewer and simpler components, thus saving money. For this to work, a special hardware driver was needed that effectively works as a middleman, handing the decoding work to the computer’s CPU. Unlike with other hardware drivers, these modem drivers aren’t around simply to make the hardware work with the operating system. Effectively, the drivers for such modems are a separate piece of software within themselves. Because of their need for this special driver software, which usually runs only on Windows, the modems are known as winmodems. As you might anticipate, using the modems under Linux presents many problems, chief among them being that Windows and Linux are two separate operating systems and, generally speaking, are incompatible. Although solutions exist and the problems aren’t insurmountable, setting up a winmodem under Linux often involves quite a lot of additional configuration. There are many types of winmodems, all of which need to be configured in different ways. An excellent web site exists that provides both step-by-step information and the necessary software. Using a computer that can get online, visit http://linmodems.org. Additionally, the user-friendly guide at http://linmodems.technion.ac.il/first.html might also be of help. As always, searching the Ubuntu forums (www.ubuntoforums.org) and specifying the make and model of your modem is also a good idea, because it’s almost certain that at least one other person will have tried to make the modem work under Ubuntu. Here are the steps necessary to configure a modem to dial up. You should ensure that your modem is plugged into the phone socket and is powered up. These instructions involve downloading the GNOME PPP dial-up tool, which will handle your dial-up requests. 1. Using another computer that’s already online (or by switching to Windows if you dual-boot), visit the following address using a web browser. You’ll be prompted to download a file. Save the file to a floppy disk or USB memory stick, or burn it to a blank CD-R/RW disk. This is necessary because you’ll need to transfer the file to your Ubuntu computer. http://us.archive.ubuntu.com/ubuntu/pool/universe/g/gnome-ppp/ gnome-ppp_0.3.23-1_i386.deb 2. On the Ubuntu computer, copy the downloaded file to the desktop.
- 179. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 143 3. Open a terminal window (Applications ➤ Accessories ➤ Terminal), and type the following: sudo dpkg –i Desktop/gnome-ppp_0.3.23-1_i386.deb You’ll need to enter your password when prompted. 4. You’ll find GNOME PPP on the Applications ➤ Internet menu. When the program starts, click the Setup button. 5. In the Setup window, click the Detect button. This will probe your modem and change GNOME PPP’s configuration settings to match. Once probing is complete, remove the check from Wait for Dialtone, but don’t change any other settings on the Modem tab. 6. Click the Options tab. Put a check alongside Dock in Notification Area. Then click the Close button. 7. In the Username, Password, and Phone Number fields, enter the relevant details, as illustrated in Figure 8-6. Remember that you should enter your dial-up username and password here, and not your Ubuntu username and password! Don’t forget to add any additional numbers to the front of the phone number if it’s necessary to deactivate call waiting or similar services on your phone line. It’s also wise to put a check in the Remember Password box, so you won’t be prompted for your password each time you dial up. Figure 8-6. GNOME PPP can be used to connect to the Internet if you use a dial-up modem. 8. Click the Connect button to dial up. Once you’re connected, you’ll see a new icon appear in the notification area. When you want to disconnect, right-click this icon and select the relevant option. Following the initial setup, it makes sense to create a desktop shortcut for GNOME PPP. This can be done by clicking and dragging the icon from the menu to a convenient spot.
- 180. 144 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING Working with a Proxy Server Some networks in offices require that you use a web proxy (often referred to as an HTTP proxy). A proxy is a server computer that provides additional security by providing a single portal to all web pages. It also helps speed up Internet access by storing frequently accessed pages. This means that if ten people request the same web page, there’s no need to get the same ten pieces of data from the Internet. The proxy computer can send them its own copies. You’ll need to speak to your system administrator to see if your office uses a proxy. If it does, your administrator will most likely give you an address, which may take the form of a web address (a URL) or an IP address. Once you have this information, follow these steps to configure the proxy: 1. Open Network Proxy Preferences (System ➤ Preferences ➤ Network Proxy). 2. On the Proxy Configuration tab, choose one of the three types of proxy configuration: • Direct Internet Connection is basically not using a proxy at all when accessing the Internet. • Manual Proxy Configuration enables you to set the proxy servers and respective ports for HTTP proxy, Secure HTTP proxy, FTP proxy, and Socks host. You can fill in this information based on the settings you received from your system administrator. If you were provided with one proxy for Internet access, check Use the Same Proxy for All Protocols and fill in the details for the HTTP proxy and port. If your proxy uses authentication, click the Details button. In the HTTP Proxy Details dialog box, check Use Authentication, and then supply the username and password. Click the Close button. • Automatic Proxy Configuration allows you to enter the link (URL) to discover the proxy settings in your office. 3. On the Advanced Configuration tab, you can set the list of sites that will bypass the proxy. By default, any site hosted on your computer is bypassed. You can add and remove sites as well. You normally add intranet (internal) web sites to this list. 4. Click the Close button after you’re finished making changes to the proxy settings. ■Tip Some ISPs run proxy servers, too. However, unlike proxies in offices, it’s normally up to you whether you choose to use them. You might find that using a proxy speeds up your connection, especially when you access popular sites, so it’s worth trying out. To find out if your ISP offers a proxy, visit its technical support web pages or phone its technical support line.
- 181. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 145 ADDITIONAL NOTEBOOK CONFIGURATION Generally speaking, a notebook computer will not need any configuration above and beyond what’s outlined in this chapter. For example, if you have a wireless network card, you can simply follow the instructions in the “Connecting to a Wireless Network” section. You might also want to make use of the GNOME CPU Frequency Scaling Monitor. If you have a compatible CPU in your notebook (or even some desktop PCs), this tool lets you adjust the speed of the chip to save power. Most modern mobile-oriented CPUs support this function. Unfortunately, because of the possibility of crackers using it to slow down your system, the applet is considered a security risk. Before you use it, you must reconfigure your system to allow it to work. Open a terminal window (Applications ➤ Accessories ➤ Terminal), and type sudo dpkg-reconfigure gnome-applets. You’ll then be asked if you want to set suid root for the cpufreq-selector applet. Select Yes using the arrow keys, and press Enter. Reboot your computer, and then right-click a blank spot on the panel at the top of the screen. Click Add to Panel and, in the dialog box that appears, scroll down to the System & Hardware heading. Click the CPU Frequency Scaling Monitor icon, and click the Add button. To alter your CPU frequency, click the applet, and choose the clock speed setting you desire. Configuring Power-Saving Features Ubuntu includes a number of features that can utilize the power-saving features of your computer, including switching off the monitor after a set period of inactivity and placing the computer into standby mode, whereby only the RAM subsystem is kept powered. However, some quick configuration is necessary to set up the system just the way you want it. ■Tip If your computer has a CPU that can adjust its clock speed on the fly, such as a mobile processor, Intel Core Duo, Intel Pentium M, AMD Turion, or AMD chip with the PowerNow! function, Ubuntu will automatically install software that will make this work. This software will run in the background. To see a live view showing the speed of your processor, right-click the panel, select Add to Panel, and choose the CPU Frequency Scaling Monitor under the System & Hardware heading. Note that to manually control the speed of the processor, you might need to undertake the steps described in the “Additional Notebook Configuration” sidebar. If you find that the computer subsequently crashes when you attempt to scale the processor speed, use the Synaptic Package Manager to install cpufreqd. This should fix the issue. As always, updating online might also provide a cure. Using Power-Management Preferences Depending on the degree to which your computer supports power-saving functionality, Ubuntu will let you configure your display to go into standby mode after a certain amount
- 182. 146 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING of time and will also allow you to configure your notebook to enter sleep (standby) mode. In addition, if you use a notebook computer, Ubuntu might let you configure additional aspects of your computer, such as the display brightness. These functions are controlled using the Power Management applet. To start this, click System ➤ Preferences ➤ Power Management. If Ubuntu is installed on a notebook computer, you’ll see three tabs in the program window: On AC Power, On Battery Power, and General. If Ubuntu is installed on a desktop computer, you’ll see just the On AC Power and General tabs. ■Note Not all PCs are created equal when it comes to power-saving features. Some support more function- ality than others. In addition, Ubuntu is compatible with most but not all power-management systems, and it might not be able to support certain power-management functionality on your system, even if such functionality normally works under Windows. Notebooks have the additional tab because it’s possible to define two separate power management profiles: one for when the computer is plugged in and one for running on battery power. This makes sense, because you might never want your display to switch off when connected to an outlet, but it’s advisable that it should deactivate within, say, 15 minutes of inactivity if the computer is running on battery power to extend the life of the battery. The three tabs of the Power Management applet are explained in the following sections. On AC Power If your computer is a desktop PC without a battery, you’ll see two options under the On AC Power tab: Put Computer to Sleep When Inactive For and Put Display to Sleep When Inac- tive For. By clicking and dragging the sliders for these options, you can control the amount of time before each feature kicks in. By dragging each to the far right, you can set a value of Never, which will deactivate that feature. ■Note The sleep mode can be to either suspend to RAM (that is, standby) or hibernate. You can set this under the General tab, as discussed in a moment. If your computer is a notebook computer, you’ll see some extra options. Depending on the technology used in your computer, you might see a Set Display Brightness To slider, which you can use to set the brightness of the screen when the power is connected. When- ever AC power is connected, the display brightness will be changed to match this setting. You may see a When Laptop Lid Is Closed option, with a drop-down list. As it suggests, this will control what happens when the notebook is closed. Depending on the hardware
- 183. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 147 contained in your computer, you might have the choice of doing nothing, blanking the screen, suspending the computer (shutting down all systems but RAM), hibernating (suspending RAM to disk and turning off the notebook) and shutting down the computer. However, not all computers support each of these modes, so the choices you see might vary. Additionally, you may see a Dim Display When Idle check box, which you can check to conserve power by dimming the screen when your system is idle. On Battery Power The options under the On Battery Power tab, which will be present only on a notebook computer, are largely the same as those under the On AC Power tab, as you can see in Figure 8-7. These settings come into operation the instant the main power is disconnected from your notebook and the battery kicks in. Figure 8-7. Notebook users can define an additional power profile that will kick in when the battery is in use. An extra option appears as the last item in the Actions section: When Battery Power is Critically Low. Here, you can opt to automatically suspend, hibernate, or shut down the notebook when the battery power is nearly gone. The check boxes at the bottom of the Display section could help save battery power considerably. You may check the Reduce Backlight Brightness option, which as it suggests, sets backlight brightness to a lower setting when you run on battery power. As with On AC Power, the Dim Display When Idle option may also be available for battery power.
- 184. 148 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING ■Caution Be aware that sleep mode requires a little battery power to work and will eventually drain your battery, especially if it’s already on its last legs! General Under the General tab, you have options to customize button actions and notifications. These settings persist whether the computer is on AC or battery power. In the Actions section, you can set what happens when the power button is pressed once the computer is active. Effectively, this controls whether or not pressing the button when Ubuntu is running should shut down the computer, suspend it, or hibernate it. You can select Ask Me, which will cause the standard Quit dialog box to appear (that is, the same dialog that appears if you click System ➤ Quit). You can also customize the action for the suspend button. The available actions are to do nothing, suspend, and hibernate. Hibernate will write the contents of RAM to the hard disk and then shut down the computer. Suspend will shut down most systems of the computer except for the RAM, which will be kept active. Then, when you press a key or move the mouse, the computer will wake up almost instantly as the subsystems are reactivated. ■Caution Hibernate doesn’t work on all systems. The best plan is to test it by selecting System ➤ Quit and selecting Hibernate. Even if Hibernate appears to work, there are reports of it being unreliable. Some users report that their computer occasionally fails to wake up, causing a loss of data. Therefore, you should always save any open files before using the hibernate function or before leaving your computer unattended for any period in which hibernate mode might kick in automatically. The General tab also lets you select whether the power icon is visible in the notification area. If you’re using a notebook, you can display the icon only when the battery is nearly drained, when your battery is charging or discharging, or regardless of the battery state. Desktop PC users can choose not to display the power icon, which makes sense. The most fuss-free option is perhaps Only Display an Icon When Charging or Discharging, which is selected by default. Finally, there’s also an extra option you can check to play sounds when error events occur. ■Tip Clicking the power icon in the notification area lets you quickly hibernate or suspend the computer. Just select the entry from the menu that appears.
- 185. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 149 Spinning Down the Hard Disk All modern hard disks come with the ability to spin down their motors to save energy. Then, when data is requested, the motors spin up again. There may be a slight delay while this happens, and some people dislike using disk spin-down because of this. However, on a notebook, it can lead to a substantial increase in battery life. On a desktop system, it’s worth considering, because over the lifetime of a computer, it can save a lot of electricity (and therefore money!). The spin-down settings are contained in the /etc/hdparm.conf file, which you’ll need to edit by hand. Follow these steps to adjust the spin-down settings: 1. Open a terminal window (Applications ➤ Accessories ➤ Terminal) and type the following: gksu gedit /etc/hdparm.conf 2. Click Search ➤ Find, and in the box, type spindown_time. 3. Click the Find button. You should find that a line in the file is now highlighted. Close the Search dialog box. 4. Change the line to remove the hash mark from the beginning, so it reads like this: spindown_time = 24 You can alter the value to anything you want. Each time unit is five seconds, so 24 equates to 120 seconds (24×5 seconds) or 2 minutes. To set a time of 20 minutes, enter 240 (240×5 seconds). If you specify a number above 240, the time units are increased to 30 minutes. In other words, a value of 241 will equate to 30 minutes, a value of 242 will equate to 60 minutes, and so on. 5. When you’ve finished, save the file. 6. Reboot for the settings to take effect. POWER SAVING: IS IT WORTH IT? An average computer draws anywhere between 100 to 1,000 watts of power. An average incandescent light bulb draws around 150 watts of power, so you can see that, relatively speaking, computers are low power consumers compared to many household devices. However, it’s still worth considering employing power-saving techniques. You might not save yourself a lot of money, but if you switch on power saving, and your neighbor does too, and her neighbor does, then the cumulative effect will add up, and we can all contribute less toward global warming.
- 186. 150 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING Try to avoid leaving your computer turned on overnight or when you’re away from it for long periods. As well as saving power, switching off your computer will avoid wear and tear on its components. Although the CPU can work 24×7 without trouble, it’s cooled by a fan that’s a simple mechanical device. There are other fans in your computer too, such as the graphics card fan and case fan. Each of these will even- tually wear out. If your graphics card fan stops working, the card itself will overheat and might burn out. The same is true of the CPU fan. However, by shutting down your computer overnight, you can effectively double the life of the fans and radically reduce the risk of catastrophic failure. Isn’t that worth considering? Adding a Printer Most people have a printer nowadays, and Ubuntu supports a wide variety of models— everything from laser printers to color ink-jet models, and even some of the very old dot- matrix printers. If you work in an office environment, you might be expected to access a shared printer. Sharing a printer is usually achieved by connecting the device directly to the network. The printer itself normally has special built-in hardware to allow this to happen. Alternatively, the printer might be plugged into a Windows computer, such as a Windows server (or even simply someone’s desktop PC), and shared so that other users can access it, a setup that is known as Windows printer sharing. Ubuntu will work with network printers of both types. Configuring a Local Printer A local printer is one that’s directly connected to your computer, normally via USB. Any printer you attach to your computer will be configured by Ubuntu automatically and ready to use immediately, as shown in Figure 8-8. Figure 8-8. The local printer is automatically configured when you connect the printer to the computer and then turn it on. However, if the printer malfunctions when printing, such as churning out paper when a print job is sent to it, printing garbage, or not working at all, you can attempt to configure it yourself. To set up a local printer, follow these instructions:
- 187. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 151 1. Click System ➤ Administration ➤ Printing. In the Printer Configuration window, click the New Printer button. You’ll see the message “Searching for Printers.” This might take a few moments to work through. 2. In the New Printer dialog box, you need to select which printer to configure. The printers that Ubuntu detected are listed under Devices. Click the printer you want to use, and then click the Forward button to continue. You’ll see the message “Searching for Drivers.” 3. Select the printer manufacturer. By default, Ubuntu selects the manufacturer that best fits your printer, but you can select another manufacturer from the list. Alter- natively, you can provide the PostScript Printer Description (PPD) file if the built-in drivers cannot operate your printer. When you’ve finished, click Forward. ■Tip You can find PPD files on the CD that came with your printer or download them. OpenPrinting (www.linux-foundation.org/en/OpenPrinting) and Adobe (www.adobe.com/products/ printerdrivers/winppd.html) offer many printer drivers for download. 4. Ubuntu again selects the detected model and corresponding driver for your printer, but you can change these selections. If you find the default driver simply doesn’t work correctly, try a similar but different model. Select the appropriate model in the Model list in the left column, and then select the appropriate driver for your printer from the Drivers list in the right column. Click the Forward button to continue. 5. You’ll be invited to give the printer a name. The default should be OK. You can fill in the Description and Location fields if you want, but these are necessary only if you intend to share the printer across a network. Click Apply when you’ve finished. ■Tip Sharing your printer on the network so that other computers can use it is simple: open the Printer Configuration window (System ➤ Administration ➤ Printers), select Server Settings in the list on the left, and put a check in the Share Published Printers Connected to This System box on the right. Then click the Apply button. Once installation has finished, the printer will then appear in the Printer Configuration window, as shown in Figure 8-9. To see whether it’s working correctly, select the printer under Local Printers in the left column, and then click the Print Test Page button on the Settings tab on the right side of the window.
- 188. 152 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING Figure 8-9. Once the printer is configured, it appears in the tree list on the left column of the Printer Configuration window. If the printer is installed correctly, you should find yourself with a test page showing color gradations. If the printer hasn’t been installed correctly, it either won’t work at all or will start spewing out page after page of junk text. If this is the case, click Cancel Tests (where the Print Test Page button used to be), and then turn off the printer. Delete the printer driver by selecting the printer in the list on the left and clicking the Delete button at the top of the Printer Configuration window. Then repeat the installation steps, this time trying different settings. Configuring a Network Printer A network printer is one that is not directly connected to any computer. Instead, it connects to the network via an Ethernet cable. In this way, all computers in the office will be able to use it. If the network printer is directly connected to a computer, it will probably be shared via Windows/SMB. In this case, follow the instructions in the next section. Some printers have the required server hardware built in, but others might use a special print server module that attaches to the printer’s USB or parallel printer port. Ubuntu can work with both types of hardware.
- 189. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 153 Ubuntu is compatible with Unix (LPD), HP JetDirect, and Internet Printing Protocol (IPP) server types. These are the most ubiquitous types currently in use for stand-alone printer servers. Before beginning, you’ll need to find out the printer’s network address and, if relevant, the queue name or the port number. You should be able to find out these details by speaking to your network administrator or the person who configured the printer. Follow these steps to configure a network printer: 1. Click System ➤ Administration ➤ Printing. In the Printer Configuration window, click the New Printer button. ■Tip You can add as many printers as you want. You could configure a local printer (that is, one attached to your computer), and then configure a network printer. 2. In the Devices list of the New Printer dialog box, select the type of shared printer you want to connect to. If you’re unsure of which to choose, try Internet Printing Protocol (IPP). If you wish to connect to a Hewlett Packard (HP) printer with an HP print server attached, select AppSocket/HP JetDirect. (You could also choose LPD/LPR Host or Printer, but this has long been replaced by IPP.) 3. In the Host field, enter the network address of the printer. In the case of HP JetDirect, the default port number should work, unless you have been specifically told to enter a different number. Depending on which server option you chose, you may also need to enter the queue name. If it’s IPP you need to provide the host and , printer queue, but Ubuntu makes it easy to set this up. Just type the network address in the Host field, and then click Find Queue. The IPP Browser dialog box will pop up and display a list of printer queues. Select a printer queue, and then click OK. Ubuntu will update the entries in the Host and Queue fields automati- cally. Click the Verify button to check if you can access the printer with the updated settings. Should it fail, try changing the Host field to the host’s IP address (ask your system administrator for this information if you don’t have it). Once you have the correct settings, click Forward. 4. As prompted, choose the printer manufacturer, printer model and driver, and printer name, just as if you were configuring a local printer. See steps 3, 4, and 5 in the previous section for guidance. Click the Apply button after you’ve made your selections. 5. When the printer is installed, select the printer from the list in the Printer Configu- ration window, and then click Print Test Page.
- 190. 154 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING If the printer doesn’t work, it’s likely that you set the wrong server type. Try an alterna- tive type; if you chose IPP the first time, try App Socket/HP JetDirect the second time. Many print servers can emulate a variety of modes, so trying a different setting may work. If the printer starts spewing out page after page of text, it’s likely that you selected an incorrect printer driver. Cancel the job at the printer by clicking Cancel Tests. Next, select the printer in the list on the left and click the Delete button at the top of the window to remove the printer. Then repeat the installation steps, this time trying an alternative driver. Configuring a Windows/SMB Shared Printer A Windows (or SMB) printer is one that’s directly connected to a computer, and then made available across the network via the network sharing function of the operating system. Effectively, the computer acts as the printer server. Often, in corporate environ- ments, such printers are attached to server computers, but an individual may share the printer attached to a workstation. In a home situation, a Windows/SMB share is an excellent and inexpensive way of sharing a printer among many computers. The printer is attached to one PC, and, as long as that computer is switched on, the printer will be available to the other computers in the household. Assuming that the printer has been correctly set up to be shared on the host computer, connecting to a Windows/SMB printer share is easy. In fact, you may find that Ubuntu finds the printer in the background and sets it up automatically! If you find the printer is available when you choose to print from an application, try it out and see if it works. However, more likely, you’ll need to add it manually. Follow these steps to set up a Windows/SMB shared printer: 1. Click System ➤ Administration ➤ Printing. In the Printer Configuration window, click the New Printer button. 2. In the Devices list, select Windows Printer via SAMBA. 3. Click the Browse button to probe the network to see if any printer shares are available. More than one might appear, so navigate through the printer shares until you find the desired printer, as shown in Figure 8-10. Select the printer and click the OK button. If you cannot find the printer share listed in the SMB Browser dialog box, you may need to enter the details in the smb:// field manually. This entry will probably take the form of the address followed by the printer name (for example, officepc/epson). Speak to your system administrator or the individual in charge of the shared printer to find out what these are.
- 191. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 155 Figure 8-10. Ubuntu should be able to automatically detect any Windows or SMB shared printers on your network. 4. Click the Verify button to check if the printer is accessible. If it succeeds, skip to step 6. If it fails, you may need to supply the username and password to access the shared printer, as described next. 5. Check the Authentication Required check box. In the Username and Password fields, type the username and password required to access the shared printer. These can be the login details of any user of the computer or, if the shared com- puter and printer are configured for Guest access, you can try typing Guest for the username and leaving the Password field blank. Once the details have been filled in, click Forward. 6. As prompted, choose the printer manufacturer, model, driver, and name, just as if you were configuring a local printer. See steps 3, 4, and 5 in the “Configuring a Local Printer” section for guidance. Click the Apply button after you’ve made your selections. 7. When the printer is installed, select the printer from the list in the Printer Configu- ration window, and then click Print Test Page.
- 192. 156 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING If the printer makes a noise as if to start printing but then decides not to, you might need to change a setting on the Windows machine. Click Start ➤ Printers and Faxes, and then right-click the shared printer’s icon. Select Properties and click the Ports tab in the Properties window. Remove the check in the Enable Bidirectional Support box, and then click OK. Then restart both the Windows and Ubuntu computers. If the printer starts spewing out page after page of text instead of the test page, it’s likely that you selected an incorrect printer driver. Cancel the job at the printer by clicking Cancel Tests. Next, select the printer in the list and click the Delete button at the top of the Printer Configuration window to remove the printer. Then repeat the installation steps, this time trying an alternative driver. Administering a Printer Like Windows, Ubuntu uses the concepts of print queues to handle printing. When you print from an application, the print job is actually held in the print queue. If the queue is empty, then the job is printed immediately. If there are already jobs waiting to be printed, or if a print job is already in progress, then the new job is added to the queue. ■Tip If you have more than one printer installed (maybe you have a printer attached to your PC but also print to a network printer), you can set one as a default, which will automatically be chosen whenever you choose to print. Simply click System ➤ Preferences ➤ Default Printer. Then select the printer from the list, click the Set Default button, and close the program window. When you print a document, the Document Print Status icon appears in the notifica- tion area (it looks like a printer). Double-click the icon to view the jobs waiting to be printed, if any. Right-clicking a job displays a context menu that lets you cancel, pause, and resume the job. When you attempt to print from applications, Ubuntu will display a unified printer interface, as you might be used to in Windows. You will find similarities when you print in Gedit, GIMP, and Firefox. The only exception is OpenOffice.org, which offers its own simplified print dialog box. Most applications that use the unified print dialog box will provide additional unique options related to that particular application. For example, GIMP offers quality settings useful for printing high-resolution photographs, and Gedit offers functions related to basic text printing. Ensure you select your printer in the list on the left of the print dialog box (on the General tab) in order to see all the available options.
- 193. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 157 Using Digital Cameras, MP3 Players, and USB Memory Sticks Removable storage is the term applied to peripherals that you might attach to your computer that contain their own storage. Examples include USB memory sticks, external hard drives, MP3 players, digital cameras, and photographic memory card readers. You might also find some devices like mobile phones are treated as removable storage devices when you attach them directly to your computer. When you attach any removable storage device, Ubuntu does the following: • Displays an icon on the desktop, which you can double-click to view the removable storage device contents. • Adds an icon to Nautilus’s Computer view, which can be accessed by clicking Places ➤ Computer (or Go ➤ Computer in a currently open Nautilus window). As with the desktop icon, double-clicking this will display the contents of the removable storage device. The Computer view is a good way to see at a glance all removable storage devices attached to your computer. • If the removable storage device contains digital images (if it’s a digital camera, for example), and you view the contents using a Nautilus window, an orange bar will appear across the top of the window, alongside a button asking if you want to import the images to the F-spot photo library program. You’ll learn more about this in Chapter 20, which provides a concise guide to cataloging and manipulating your digital images. The contents of the removable storage device will be accessible in exactly the same way as any other files on your system. You should be able to copy, delete, and create files on the device, provided the device isn’t read-only (if the read-only switch isn’t set on a USB memory stick, for example). If the device contains MP3 tunes, you should be able to double- click them to play them, provided the playback codecs are installed (see Chapter 18). However, a very important rule must be followed when you’ve finished with removable storage devices under Ubuntu: the device must be unmounted before you physically remove it. This applies also to memory cards that are inserted into a card reader—before removing any card from the card reader, it must be unmounted. This is quite simple to do. Just right-click the icon on the desktop or within the Computer window and select Unmount Volume. Make sure that you save and close any files that you may have been working on before you do so, or you may see an error message. You’ll need to close any Nautilus windows that might have been browsing the storage device too. If you’ve used the command line to manipulate files on the removable storage device, remember to close any running programs in the terminal window. You’ll also need to switch out of the removable storage device directory before you’ll be allowed to unmount it (alternatively, you can simply close the terminal window).
- 194. 158 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING Following this, you can safely physically remove the card or unattach the device. Rein- serting it will make it available once again. ■Caution Be very careful not to remove a memory card from a card reader while you’re writing or reading from it on your PC. This will most likely damage the card irreparably. At the very least, it will wipe the contents of the card, so you’ll lose your photographs. Configuring a Scanner Although scanners have fallen out of favor recently with the advent of digital photography, they’re vital for getting nondigital photos and old documents onto your PC. A lot of flatbed scanners can be made to work under Ubuntu, but not all types are supported. You can check the list of currently supported scanners by visiting www.sane-project.org. Additional models are added to the list all the time, and this is another reason to make sure your system is completely up-to-date (see Chapter 9 and Appendix D; the former explains how to update your system software, while the latter describes how to update to the latest version of Ubuntu). The best test of whether your scanner is supported under Ubuntu is simply to see if it will work. Scanning within Ubuntu is handled by the XSane utility. This is a stand-alone program that operates like the TWAIN drivers that you might have used under Windows. ■Tip XSane is even capable of optical character recognition! Simply use the Synaptic Package Manager to download and install the gocr program. Then, after you scan an image, in the viewer window, select File ➤ OCR - Save As Text. To configure a scanner and scan images, follow these steps: 1. Select Applications ➤ Graphics ➤ XSane Image Scanner. On startup, the program will attempt to detect your scanner. If it finds a compatible model, XSane will start. If the scanner isn’t recognized, a dialog box will appear telling you so. 2. XSane consists of a handful of windows, including the main program window, the Standard Options dialog, the Histogram window, and the Preview window. You can close the Standard Options and Histogram windows for the moment and concen- trate on the main XSane program window, which should be similar in appearance to the TWAIN scanner drivers you might have used under Windows.
- 195. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 159 3. At the top of the window is the automatic document feeder option, where you can set the number of pages in the feeder to scan in one sitting. If your scanner does not have an automatic document feeder, you can do this manually by changing the paper yourself immediately after the previous paper has been scanned. 4. Beside the automatic document feeder option is the XSane mode drop-down list. Here, you can select from a variety of scanning modes, such as those to scan docu- ments for faxing. However, in most cases, the Save setting is best. This lets you preview your scans and then save them to disk if you’re happy with them. 5. Beneath this is the filename field. Here you should type the filename you wish to use for the scanned file. XSane can save in a variety of file formats, and it detects which you want to use from the file extension you choose. For example, typing picture.jpg will cause the picture to be saved as a JPEG image. Typing picture.tif will cause the image to be saved as a TIFF file. 6. Beneath the filename field, on the left, is the filename number count. This is used if you wish to scan many images in succession—a number is added to the end of the filename, and this control configures the increment. A setting of +1 is fine. 7. Beneath the filename field, and to the right, is the type drop-down list, by which you can force a certain file type to be used when saving files. However, leaving this at the default By Ext is best. This means that, as mentioned previously, you can define the type of image saved by the filename extension. 8. Next down is the color/monochrome drop-down list. Here, you can select to scan Lineart (binary), Gray (grayscale), Halftone, or Color. If you select anything other than Lineart, additional sliders will appear to let you control the gamma, brightness, and contrast of the scanned image, in that order. In addition, several other buttons will appear at the bottom of the program window, all of which you can leave at default settings. Remember that hovering the mouse cursor over each will explain what it does. 9. Next is the source medium type drop-down list. Here you can specify the type of medium you are scanning—whether it’s a full-color picture, a slide/transparency, or a negative. For normal operations, select Full Color Range. 10. Next is the dots per inch (DPI) setting. Generally speaking, 300 DPI is acceptable for scanned photos, while 150 DPI will be acceptable for artwork such as diagrams. 11. To scan a preview, click the Acquire Preview button within the preview window. The results should be something similar to what’s shown in Figure 8-11.
- 196. 160 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING Figure 8-11. The XSane program works a little like TWAIN drivers under Windows and makes scanning easy. 12. When the preview scan has finished, you can adjust the brightness/contrast set- tings using the sliders in the XSane program window (assuming you selected color scanning earlier). You should also click and drag to crop the image in the preview window, if XSane doesn’t do so automatically. 13. When you’re satisfied with the preview, click the Scan button in the main XSane program window. The image will then be scanned at your chosen resolution and saved to your /home directory, using the filename you specified earlier. Installing 3D Drivers and Activating Desktop Visual Effects The modern trend is for operating systems to incorporate flashy graphical effects into ordinary desktop functions. For example, when windows are minimized in Windows Vista, they physically shrink and fade down to the taskbar. Under Mac OS X, program
- 197. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 161 windows appear to be “poured” into the Dock when minimized. In Windows Vista, when you press Alt+Tab to switch through open programs, the program windows are previewed vertically in a graphical arrangement, and you can flick through them, rather like searching through a card index. These effects are achieved using the 3D processing power of the computer’s graphics card, even though the effects aren’t necessarily 3D in nature. ■Note On a technical level, the technique is known as compositing. What you see on the screen is first drawn in the graphics card memory and then transferred to the screen, rather than everything simply being drawn directly onto the screen. Ubuntu includes similar desktop visual effects, courtesy of a system called Compiz Fusion (www.compiz-fusion.org). However, all desktop visual effect systems have a couple requirements, and these apply to Ubuntu as well: • For desktop effects to work, your graphics card (or motherboard graphics chipset) must be comparatively recent. Examples include the ATI Radeon, nVidia GeForce, and Intel GMA product lines. Most graphics cards manufactured within the last two or three years with a graphics processing unit (GPU) should be adequate, and very recent models definitely will work. • The correct graphics drivers must be installed. Some of Ubuntu’s built-in graphics drivers lack the necessary 3D functionality to support desktop effects. Currently, Intel GMA and some ATI Radeon graphics cards are supported by default because Intel and ATI provide open-source 3D-capable drivers. For other hardware, including nVidia cards, you will need to manually install a proprietary driver, which is not difficult to do. ■Note You only need to install the proprietary driver if you wish to utilize desktop visual effects. Ubuntu includes a default 2D graphics driver that provides excellent functionality for everyday desktop use. Some proprietary 3D graphics drivers are provided under Ubuntu, but only if open- source equivalents are missing. It is hoped that open-source drivers will one day replace the need for proprietary drivers. So do you actually need to install new drivers? If you find that desktop effects are working, then the correct drivers are already installed. A good way to test this is to hold down Ctrl+Alt and then tap the left or right arrow key. This will switch to the next virtual desktop. If the entire desktop physically slides out of the way, then desktop effects are activated. If the desktop remains static and a small dialog box appears in the center of the screen to let you choose a virtual desktop, then desktop effects are not activated.
- 198. 162 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING A utility called Hardware Drivers lets you manage proprietary drivers for your graphics card. This should appear in the notification area automatically immediately after installa- tion if your hardware requires proprietary drivers. Follow these instructions to activate the proprietary graphics driver: 1. Click the Hardware Drivers icon to run the Hardware Drivers program. If it’s not visible, click System ➤ Administration ➤ Hardware Drivers. 2. Supply your password in the authorization dialog box and click OK. 3. In the Hardware Drivers window, check the Enabled box beside your graphics card device driver. 4. A dialog box appears, asking you to confirm that you want to enable the driver. It explains that enabling the driver enables visual effects on your desktop. Click the Enable button. 5. The Summary dialog box appears to tell you what new software will be installed. Click the Apply button. 6. The driver will be downloaded and installed. Then the Changes Applied dialog box will appear to tell you that the changes are completed. Click the Close button. 7. In the Hardware Drivers window, click the Close button. 8. You need to restart the computer so that Ubuntu will use the new driver. Select System ➤ Quit, and then click Restart. Once the new graphics driver is installed, desktop visual effects should start working immediately. If you experience seemingly random system-wide crashes or freezing after installing a 3D graphics driver, consider reverting to your old setup by using the Hardware Drivers program (System ➤ Administration ➤ Hardware Drivers) to disable the new driver. Unfortunately, in a small minority of cases, the proprietary driver can prove buggy. ■Tip On one of our test PCs, containing an nVidia GeForce 6600 graphics card, the Hardware Drivers program didn’t install the new driver as it should. This is probably a bug that might be fixed by the time you read this, but we got around it by manually installing the driver. The procedure is to open the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager), search for the nvidia-glx- new package, and mark it for installation. Then reboot. When the system is up and running again, start Hard- ware Drivers, and once again put a check in the box alongside the graphics driver. If there’s already a check there, remove it and put it in again. Upon a second reboot, desktop visual effects should become operational.
- 199. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 163 Two modes of operation are available for desktop visual effects: Normal and Extra. Normal is the default and provides a good subset of the available effects: menus fade into view, program windows shrink when minimized, and so on. Extra provides a lot more effects, some of them rather extreme, such as wobbling when you click and move a window, and windows appearing to explode to the corners of the screen when maximized. To switch between the two settings, right-click the desktop, select Change Desktop Background, and then click the Visual Effects tab in the dialog box that appears. Configuring Bluetooth Bluetooth is the short-range networking facility that allows various items of hardware to work with each other wirelessly. You can use Bluetooth for everything from file transfers between a mobile phone and computer to employing a wireless keyboard or mouse with your desktop computer. For Bluetooth to work, both devices need to have Bluetooth support. Many mobile phones come with Bluetooth nowadays, as do an increasing number of notebook computers. It’s also possible to buy very inexpensive Bluetooth USB adapters. Bluetooth support is built into Ubuntu and should activate automatically if Bluetooth hardware is present on your PC. You will know if this is the case because a Bluetooth icon will appear in the notification area. This is used to administer all Bluetooth devices that you might want to connect to your computer. Pairing Bluetooth Devices When two pieces of Bluetooth-compatible hardware need to communicate on a regular basis, they can pair together, a process also known as pairing or bonding. This means that they trust each other, so you don’t need to authorize every attempt at communication between the devices. Indeed, some devices won’t communicate unless they’re paired in this way. Pairing is very simple in practice and works on the principle of a shared personal ID number (PIN). The first Bluetooth device generates the PIN, and then asks the second Bluetooth device to confirm it. Once the user has typed in the PIN, the devices are paired. Pairing is easily accomplished under Ubuntu and doesn’t require any additional software. As an example, the following are the steps for bonding a Nokia 6680 phone to an Ubuntu PC. Bonding for devices without a user interface, such as keyboards, is handled differently, as explained in the “Using a Bluetooth Keyboard or Mouse” section a little later in the chapter.
- 200. 164 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING 1. Ensure the Ubuntu PC is visible, which is to say that other Bluetooth devices can detect it. Right-click the Bluetooth icon in the notification area, click Preferences, and make sure that the radio button alongside Visible and Connectable for Other Devices is selected. Click Close. 2. It’s easiest to initiate pairing on the device you want to connect to the PC, which should then autosense the PC’s Bluetooth connection. You will need to discover how to do this on your particular Bluetooth device. On the Nokia 6680, we opened the menu and selected Connections ➤ Bluetooth. Then we pressed the right arrow key to select Paired Devices and selected Options ➤ New Paired Device ➤ More Devices. This made the phone autosense the Ubuntu PC, which was identified by its hostname, followed by -0. You might remember that the hostname was autoge- nerated during installation of Ubuntu. It is normally your username followed by desktop. In our case, the Ubuntu PC was identified as ubuntu-desktop-0. 3. The Nokia 6680 then prompted us to create a PIN. You may find that some devices simply show a random PIN that you should write down. After entering our PIN on the phone, a comment box popped up on the Ubuntu computer, notifying us of a pairing request between Ubuntu and the mobile phone, as shown in Figure 8-12. Figure 8-12. A pairing request is easily accomplished through the Bluetooth applet. 4. We clicked the Enter Passkey button in the comment box and were prompted to input the same PIN we set earlier on the phone. We typed the same PIN and pressed OK. Following this, the two devices were paired. If you subsequently wish to remove the pairing, right-click the Bluetooth icon and select Preferences. In the list of Bonded Devices at the bottom of the dialog box, select the entry for your Bluetooth device and click the Delete button. Don’t forget to remove the pairing on the Bluetooth device, too. Transferring Files Between Bluetooth Devices If you own a Bluetooth-equipped camera phone, you might be used to transferring pictures to your computer using Bluetooth. It’s by far the easiest way of getting pictures off the phone and avoids the need for USB cables or card readers. To transfer files via Bluetooth, you can use the Bluetooth applet.
- 201. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 165 ■Note Some phones refuse to transfer files unless the phone and computer are paired, so follow the instructions in the previous section first. Phones like the Nokia 6680 don’t need pairing for file transfer, although each transfer will need to be confirmed manually. Sending Files to a Ubuntu PC Follow these steps to send files from a Bluetooth device to your PC: 1. Right-click the Bluetooth icon in the notification area and select Preferences. In the Bluetooth Preferences dialog box, click the General tab. Check Receive Files from Remote Devices. A bubble will appear that says that Ubuntu is ready to receive incoming files. Click Close in the Bluetooth Preferences dialog box. 2. On the Bluetooth device from which you wish to send the file, start the file transfer. On the Nokia 6680, we selected the file and clicked Send ➤ Via Bluetooth. 3. A dialog box may appear on the Ubuntu computer asking you to confirm that you want to receive the file. Click OK. Once the file is received, the file will be copied to the desktop folder. Sending Files from a Ubuntu PC to Another Device There are two ways to send files to another Bluetooth device from your Ubuntu PC. The first is to use the Bluetooth applet. The second is to right-click the file in question and select Send To. The second method is useful if you wish to send many files at once, and you will have the option of automatically zipping the files into a single archive (but bear in mind that the Bluetooth device receiving the file will need to be able to subsequently unarchive the file). Using the Bluetooth Applet Follow these steps to use the Bluetooth applet to send files: 1. Right-click the Bluetooth icon in the navigation area and click Send File. 2. In the Choose Files to Send dialog box, navigate to the file you want to send and click Open. 3. In the Select Device dialog box, select the target Bluetooth device and click the Connect button. 4. The target Bluetooth device might prompt you to accept or deny a file transfer request from Ubuntu. Choose to accept it. 5. After the file has been received by the Bluetooth device, click Close.
- 202. 166 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING Using the Send To Option To use the Send To option on the context menu to send one or more files, follow these steps: 1. Either right-click an individual file or select several files and click one of them. Right-click and select Send To. 2. In the Send As drop-down list of the dialog box that appears, select Bluetooth (OBEX Push). In the Send To drop-down list, ensure that your Bluetooth device is selected. 3. If you’re sending several files, you can put a check in the Send Packed In check box. This will create a new single .zip archive and add the files to it automatically. Otherwise, each file will simply be sent one after the other. 4. Click the Send button. You may be prompted to authorize receipt of the files on the Bluetooth device, so do so. Bear in mind that transfer of many files may take some time because Bluetooth is not a particularly speedy form of data transfer. 5. Once the file transfer is complete, click the Close button. Using a Bluetooth Keyboard or Mouse Your Bluetooth-equipped keyboard or mouse may work automatically under Ubuntu. However, if not, you may need to pair it to your PC, as follows: 1. Before you can pair your keyboard or mouse with Ubuntu, you must edit a system configuration file. Open a terminal window (Applications ➤ Accessories ➤ Ter- minal) and type the following, which will open the file in the text editor: gksu gedit /etc/default/bluetooth 2. In the document that appears, look for the line that reads HIDD_ENABLED=0 and change the 0 to a 1, so it reads HIDD_ENABLED=1. Then save the file and quit Gedit. 3. Ensure the Ubuntu PC is set to be discoverable. Right-click the Bluetooth icon in the notification area, click Preferences, and make sure that the radio button alongside Visible and Connectable for Other Devices is selected. Click Close. 4. Switch your keyboard or mouse to discoverable mode. Read the instructions for your device to find out how this is done. On an iGo Stowaway keyboard we used during testing, this involved pressing the Ctrl+blue Fn+green Fn keys simultaneously.
- 203. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 167 5. While you’re reading the manual, find out if the device has a default passkey. Mice almost certainly will (and it’s nearly always 0000), but keyboards might require you to type one manually when it comes to the pairing request. 6. Right-click the Bluetooth icon and select Preferences. In the Bluetooth Preferences dialog box, click the Services tab. Ensure there is a check alongside Input Service in the list, and then click the Input Services entry in the list so that it is selected. Click the Add button at the bottom of the dialog box. 7. You should find that your keyboard/or mouse is detected automatically and appears in the list below the Select Device heading (if not, ensure that it is still in discov- erable mode, and hasn’t switched itself off ). Click the entry for the keyboard or mouse, and then click the Connect button. 8. A comment box should pop up on the Ubuntu computer, notifying you of a pairing request between Ubuntu and the keyboard or mouse (similar to Figure 8-12). Click the Enter Passkey button. 9. What happens next depends on whether you’re trying to connect a keyboard or mouse (bear in mind that the process of pairing quickly times out on the Ubuntu computer, so you need to complete the following steps without hesitation). • In the case of a mouse, enter the passkey that you read earlier in the manual for the mouse. As mentioned, this is usually 0000. Once you click OK, the mouse should be paired and should start working. • Some keyboards also use a default passkey of 0000, and, if so, you can enter that, and the keyboard should be paired. However, some Bluetooth keyboards might require you to enter a passkey created on the computer. In the Authentication Request dialog box on the Ubuntu PC, type a random four-digit passkey—something like 1234 (although for security reasons, you might want to choose something that’s slightly less easy to guess). Click OK. On the Bluetooth keyboard, type the same number and hit Enter. Following this, you should find the keyboard is paired with the computer and will work. 10. Click Close in the Bluetooth Preferences dialog box. If you find the keyboard or mouse does not work after a reboot, try turning it on and off again. If that doesn’t work, deactivate the Bluetooth functionality on the PC, perhaps by momentarily unplugging the Bluetooth dongle or, on a notebook, using the relevant keyboard combination to turn off and on again the Bluetooth system.
- 204. 168 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING Configuring Sound Cards Generally speaking, your sound card shouldn’t require any additional configuration and should work immediately after you install Ubuntu. The icon for the volume control applet is located at the top right of the Ubuntu desktop, and it offers a quick way to control the master volume. However, if your sound card offers more than stereo output, such as multiple-speaker surround sound, then it might be necessary to take some simple steps to allow full control of the hardware: 1. Right-click the volume control icon (the one that looks like a speaker), and select Open Volume Control. 2. In the dialog box that appears, click Edit, and then click Preferences. 3. The Volume Control Preferences dialog box appears, as shown in Figure 8-13. Select the sliders that you wish to be visible. For example, on a desktop computer that has 5.1 surround sound, we were able to add a slider for the center and back speakers. On a notebook that has a sound card featuring pseudo-surround sound, we could add a control to alter the intensity of the effect. Figure 8-13. You can add sliders to control all aspects of your sound card’s output.
- 205. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 169 4. When you’ve finished, click the Close button. The new controls should then be visible in the Volume Control window. Configuring E-Mail and Instant Messaging Being online is all about staying in touch, and Ubuntu is no slouch in this regard. Ubuntu offers a full-featured e-mail program, called Evolution, as well as an instant messaging client called Pidgin. Unlike similar instant messaging clients, Pidgin supports a wide variety of Internet chat protocols, such as AIM/ICQ, MSN, Yahoo, Jabber, and IRC. This means you can chat with friends and colleagues on different networks using this one program. Evolution is able to work with both IMAP and the popular POP3 mail servers offered by ISPs and used within corporate environments. Additionally, it can work with the Microsoft Exchange protocol used by offices running the Outlook mail program and also Novell GroupWise. We’ll look at the specifics of using Evolution in Chapter 27. Here, you’ll learn how to configure the e-mail client to receive and send mail. Configuring E-Mail Access Before starting, you’ll need to find out the addresses of the mail servers you intend to use. In the case of POP3 and IMAP mail accounts, you’ll need to know the incoming and outgoing server addresses (outgoing may be referred to as SMTP). In the case of Microsoft Exchange, you’ll need to know the OWA URL and, optionally, the Active Directory/Global Address List server. With Novell GroupWare, you’ll simply need to know the server name. You’ll also need to know your username and password details for the incoming and possibly outgoing mail servers. After gathering the necessary information, follow these steps to configure Evolution: 1. Start the Evolution e-mail client by clicking its icon at the top of the screen, to the right of the menus. Alternatively, you can select Applications ➤ Office ➤ Evolution Mail and Calendar. 2. When Evolution starts for the first time, you’ll be invited to enter your configu- ration details via a wizard. Click the Forward button. 3. The next screen offers an option to restore Evolution settings from backup. This is a convenient option for migrating accounts from one Evolution client to another. Since this is your first time using Evolution, you can simply ignore this option by clicking the Forward button.
- 206. 170 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING 4. You are asked for your name and the e-mail address you wish to use within Evo- lution. These are what will appear in outgoing messages. Beneath this is a check box that you should leave checked if you want the account you’re about to create to be the default account. In nearly all situations, this will be the correct choice. You can also fill in the Reply-To and Organization information if you wish, but these fields can be left blank. They’re not normally displayed by most e-mail clients. Click the Forward button to continue. 5. The next screen asks for details of the receiving (incoming) mail server that you want to use, as shown in Figure 8-14. First, select the server type from the drop- down list. If you don’t know which option to go with, select POP. This is by far the most common type of incoming mail server currently in use. Figure 8-14. Evolution can work with a variety of mail servers, including POP3, Microsoft Exchange, and IMAP.
- 207. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 171 6. Additional configuration fields will appear when you make the selection of server type. Enter the server address and username in the relevant fields. Click Check for Supported Types to find out what kind of authentication security, if any, your mail server uses. Following this, you should find the details are filled in automatically. Click Forward to continue. 7. You might need to enter your mail password, depending on which server type you chose. In some cases, you’ll need to type this later when you download your mail for the first time. Click Forward to continue. 8. You’re given the chance to choose between various additional options, such as how often you want Evolution to check for new mail or if you want to delete mail from the server after it has been downloaded. Unless you have been told otherwise or have special requirements, it should be okay to leave the default settings as they are. If you use a Microsoft Exchange server, you may need to enter the Active Directory/Global Address List server details here. Click Forward to continue. 9. Depending on the server type you chose, you might now need to fill in the outgoing (SMTP) server address. Type this into the Server field. If your SMTP server requires authentication, put a check in the relevant box, and then enter your username. Once again, you can click the Check for Supported Types button to automatically fill in the authentication details. Click Forward to continue. 10. You’re invited to enter a name for the account. This is the account name you will see when you use Evolution. The default is your e-mail address, but you can type something more memorable if you wish. Click Forward to continue. 11. Finally, choose your location, which will have the effect of automatically defining your time zone. This will ensure that e-mail messages are correctly time-stamped. You can choose your location from the Selection drop-down list (choose the nearest large city in your time zone), or click your location on the map. As during initial installation of Ubuntu, the map will zoom in when you click continents, to let you more precisely click the place you live. Click Forward to continue, and then click the Apply button to finish the wizard. As noted earlier, Chapter 27 includes a full run-through of Evolution’s main functions. Setting Up Instant Messaging Instant messaging is a way of chatting with other people in real time. It’s as if you were having a phone conversation, but you’re typing instead of speaking. You can talk to one other person or a whole group of people and sometimes share files with them.
- 208. 172 CHAPTER 8 ■ GETTING E VERYTHING UP AND RUN NING The instant messaging program under Ubuntu, Pidgin, offers the same functions and works in an almost identical way to programs that you might have used under Windows. It supports virtually all the popular chat standards, such as ICQ/AOL, Google Talk, Yahoo, and MSN (Hotmail/Passport). It assumes that you already have an account with each service, which will likely be the case if you’ve used instant messaging programs under Windows. You can have as many accounts as you wish and can select the one you want to use when you log in. To transfer your instant messaging account over to Pidgin, you just need your screen name and password. As with other instant messaging clients, you’ll be able to choose an on-screen alias. Follow these steps to set up Pidgin: 1. Start Pidgin by clicking Applications ➤ Internet ➤ Pidgin Internet Messenger. When the program starts for the first time, it will automatically open the Accounts dialog box, although it might be behind the main login window. If so, click to bring it to the front of the desktop. 2. In the Accounts dialog box, click the Add button and, in the window that appears, select the account type you want to set up from the Protocol drop-down list. 3. Enter your screen name, password, and alias details, as required. 4. If you don’t want to type your password each time you run Pidgin, check Remember Password. However, be aware that someone else using the computer could abuse your account. 5. You can put a check in the New Mail Notifications box if you want to be notified of any mail sent to you via the address registered with your instant messaging service. 6. If you want to use a buddy icon (the icon that others will see when they connect to you), click the Open button and browse to a picture. 7. If you wish to connect to a specific instant messaging server or if your network uses a proxy, click the Advanced tab and enter the details accordingly. In most cases, you won’t need to do this. 8. When you’ve finished, click the Save button. 9. Pidgin will attempt to connect to the chat service. In the main Pidgin window, you should be able to see your chat contacts. Close the Accounts window. After this, you should find the program works just like any other instant messaging program. You can double-click each contact in your list to start a conversation. To sign off, right-click the icon in the notification area, and then select the Change Status option from
- 209. C HAPT ER 8 ■ GETTING EV ERYTHING UP A ND RUNN IN G 173 the menu, as shown in Figure 8-15. To add another account, click Accounts ➤ Manage, click the Add button in the Accounts window, and then follow the preceding step-by-step instructions. Figure 8-15. You can control Pidgin by right-clicking its notification area icon. Summary In this chapter, you learned how to set up just about every piece of hardware you might have attached to your computer. Additionally, we looked at configuring various software components that are vital for Ubuntu’s correct functioning. We stepped through getting online with Ubuntu (including joining a wireless network), configuring e-mail, adding a printer, connecting to a digital camera, configuring a 3D graphics card, and much more. In Chapter 9, we move on to look at how you can ensure that your system is secure and protected.
- 211. CHAPTER 9 ■■■ How to Secure Your Computer L inux is widely considered one of the most secure operating systems around. On a basic level, Linux is built from the ground up to be fundamentally sound, and it forces users to work with security in mind. For instance, it enforces the system of ordinary users who are limited in what they can do, thus making it harder for security breaches like virus infec- tions to occur. In addition, Linux contains a firewall that is hardwired into the kernel. It’s called iptables (www.netfilter.org) and is considered among the best solutions by practically all computer security experts. Not only that, but it can protect your home PC just as well as it can protect the most powerful supercomputer. But, as with many Linux kernel components, iptables is difficult to use. It requires in- depth knowledge of how networks operate and an ability to hack configuration files, both of which are beyond the skills of many ordinary computer users. Fortunately, several programs act as interfaces to iptables and make it simple to operate (or at least as simple as any equivalent Windows-based software firewall, such as ZoneAlarm from Zone Labs). Ubuntu has a built-in firewall, but it is not configured by default. This is because the developers don’t think that Ubuntu requires a firewall, and on a technical level, they’re correct. Unlike with Windows, Ubuntu has no Internet-facing services (programs that wait for connections from the Internet or local area network). It was just such a service on Windows XP that allowed the Blaster worm to bring the Internet to its knees in 2003 (see http://en.wikipedia.org/wiki/Blaster_worm). Expressed metaphorically, the theory is that without any windows or doors, Ubuntu will be difficult, if not impossible, for hackers to break into (or for viruses or worms to infect). However, configuring the firewall with a program like Firestarter, which we examine later in this chapter, can be done so quickly and with such little effort that, in our opinion, there’s no reason not to make use of the Linux firewall. In addition, as with most versions of Linux, Ubuntu doesn’t come with antivirus protection out of the box. This is because there are practically no viruses affecting Linux, and it is reasoned that there simply isn’t a need for virus protection. However, as with a firewall configuration program, installing an antivirus program is easily done, and we explain how in this chapter. But first, you’ll spend some time examining more basic security concepts. Following that, we’ll look at how to encrypt files and e-mail so that they can be 175
- 212. 176 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R opened only by the intended recipients. Then we’ll cover some elementary steps that you can take to protect your system. Windows Security vs. Linux Security If you’ve switched to Ubuntu from Windows, there’s a very good chance that the security failings of Windows featured in your decision. Windows Vista contains many improve- ments, but Microsoft’s record on security over the past few years has been appalling. New and serious security warnings appeared on an ongoing basis, and even now, new and devastating viruses make news headlines with worrying frequency (usually described as “a PC virus” rather than what it actually is—a Windows virus). One argument is that Windows is the target of so many viruses merely because it’s so popular. Although it’s true that some of those who write viruses do so because they dislike Microsoft, there’s also little doubt that Windows has more than its fair share of security issues. Many people are still critical of Microsoft’s approach to security. For example, Microsoft’s latest operating system, Windows Vista, features User Account Control (UAC) dialog boxes that appear whenever a system-affecting action is required. However, they are so common that many people stop reading what they warn about, and simply click OK by reflex. Compare this to Ubuntu. Similar dialog boxes appear whenever a system-affecting action is required, but here the user’s password must be entered. This forces the user to stop and think, rather than simply clicking a mouse button. Also, the Ubuntu password dialog boxes have more of any impact because they appear far less frequently than UAC dialog boxes. While Vista offers reasonable security, Microsoft’s previous operating system, Windows XP, is considered an easy target for hackers and virus writers. Upon installation, the default user is given root powers. True, a handful of tasks can be performed only by the genuine administrator, but the default user can configure hardware, remove system software, and even wipe every file from the hard disk. While you would never intentionally damage your own system, computer attackers use various techniques to get you to run malicious software (by pretending it’s a different file, for example) or simply infect your computer across the Internet without your knowledge, which is how most worms work. Viruses and worms also usually take advantage of security holes within Windows soft- ware. As just one example, a famous security hole within Outlook Express some years ago allowed a program attached to an e-mail message to run when the user simply clicked a particular message to view it. In other words, infecting a Windows machine was as easy as sending someone an e-mail message! It’s a different story with Linux. Viruses and worms are far rarer than they are on Windows. In fact, the total number of viruses and worms that have been found in the wild infecting Linux systems number far less than 100 (one report published in 2003 put the number at 40,
- 213. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 177 and the number is unlikely to have grown much since then). Compare that to Windows, where according to the Sophos antivirus labs (www.sophos.com), approximately 1,000 new viruses are discovered every month! The Sophos antivirus product now guards against just under 120,000 viruses. ■Note The high number of Windows viruses may be because of the quantity of Windows PCs out there. After all, for a virus to spread, it needs computers to infect, and it won’t have trouble finding other Windows computers. But while we would love to say that security holes are not found on Linux, the sad truth is that they’re a fact of life for users of every operating system. Many so-called rootkits— specialized software toolkits that aim to exploit holes within the Linux operating system and its software—are available. The bottom line is that while writing a virus or worm for Linux is much harder than doing the same thing on Windows, all Linux users should spend time securing their system and never assume that they’re safe. Root and Ordinary Users As we’ve mentioned in earlier chapters, Linux makes use of something called the root user account. This is sometimes referred to as the superuser account, and that gives you an idea of its purpose in life: the root user has unrestricted access to all aspects of the system. The root user can delete, modify, or view any file, as well as alter hardware settings. Linux systems also have ordinary user accounts, which are limited in what they can do. Such users are limited to saving files in their own directory within the /home directory (although the system is usually configured so that an ordinary user can read files outside the /home directory, too). But an ordinary Ubuntu user cannot delete or modify files other than those that he created or for which he has explicitly been given permission to modify by someone else. The user account you created during the installation of Ubuntu is a limited account, but on some Linux systems, it’s possible to type root at the login prompt and, after providing the correct password, actually log in as root and perform system maintenance tasks. Ubuntu is slightly different in that the root account is disabled by default, and users are instead able to borrow superuser powers whenever they’re required. For this to happen, they simply need to provide their own login password. With desktop programs, a password prompt dialog box will appear automatically, but at the command prompt, users need to preface commands with sudo.
- 214. 178 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Although the root account is disabled, most key operating system files “belong” to the root user, which is to say that only someone with superuser powers can alter them. Ordinary users are simply unable to modify or delete these system files, as shown in Figure 9-1. This is a powerful method of protecting the operating system configuration from accidental or even deliberate damage. Figure 9-1. Ordinary users are simply unable to modify or delete essential system files under Linux. ■Note Along with the root and ordinary user accounts, there is a third type of Linux account, which is similar to a limited user account, except that it’s used by the system for various tasks. These user accounts are usually invisible to ordinary users and work in the background. For example, the CD/DVD-ROM subsystem has its own user account that Ubuntu uses to access the CD/DVD-ROM hardware. The concepts of users and files are discussed in more depth in Chapter 14.
- 215. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 179 ARE YOU A CRACKER OR A HACKER? Linux users are often described as hackers. This doesn’t mean they maliciously break into computers or write viruses. It’s simply using the word hacker in its original sense from the 1970s, when it described a computer enthusiast who was interested in exploring the capabilities of computers. Many of the people behind multinational computing corporations started out as hackers. Examples are Steve Wozniak, a cofounder of Apple Computer, and Bill Joy, cofounder of Sun Microsystems. The word hacker is believed to derive from model train enthusiasts who “hacked” train tracks together as part of their hobby. When computing became popular in the early 1970s, several of these enthusiasts also became interested in computing, and the term was carried across with them. However, in recent years, the media has subverted the term hacker to apply to an individual who breaks into computer systems. This was based on ignorance, and many true hackers find the compar- ison extremely offensive. Because of this, the term cracker was invented to clearly define an individual who maliciously attacks computers. So, don’t worry if an acquaintance describes herself as a Linux hacker, or tells you that she has spent the night hacking. Many Linux types use the term as a badge of honor. Encryption Encryption is a means of protecting data by encoding it in such a way that the casual observer can’t view it without a password/passphrase or a special file known as a crypto- graphic key (normally abbreviated to key). Encryption is used for privacy purposes and also to verify the identity of the person who originated a file or an e-mail message. Two types of encryption are normally utilized on home computers and offered by Ubuntu: File encryption: Files can be encrypted so that they require a secret passphrase to be decrypted. Alternatively, you can encrypt files so that they can be decrypted only by a particular individual. E-mail encryption: E-mail messages can either be encrypted, so that only the recip- ient will be able to read them, or authenticated via a cryptographically generated signature, so that the recipient can be sure the e-mail genuinely originated from you and not a third party. Ubuntu’s e-mail program, Evolution, supports the digital signing of e-mail, as well as full encryption of e-mail sent to others or decryption of e-mail sent to you. The Nautilus file manager can also be used to encrypt files for personal use or so that only a particular individual will be able to decrypt them.
- 216. 180 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R ■Note Although Evolution supports encryption, you don’t have to use it. Indeed, many Ubuntu users don’t utilize public key encryption, although power users often go this route. And, in general, relatively few people use e-mail encryption. Underpinning Ubuntu’s encryption system is a public key encryption system. Two keys are generated by an individual: the private key and the public key. The private key is kept private by the individual who generated it, while the public key is passed around to anyone who wants it (or even published on Internet databases). The two keys are related in that one key can encrypt data so that only the corresponding key can decrypt it. For example, you could encrypt a file or e-mail message intended for Jane using her public key, and only Jane would be able to decrypt it using her private key. However, and crucially, you would not be able to subsequently decrypt the file, even though you had encrypted it in the first place—data encrypted with a public key cannot then be decrypted with that same public key. Only the private key can decrypt it. If Jane wanted to encrypt a file so that only you could decrypt it, she would need to use your public key. You would then use your private key to decrypt it. No one else would be able to decrypt it once it was encrypted. When utilized in an e-mail program, public key encryption works in two ways. When sending a message to you, anyone can use your public key to encrypt a message (and any attached files) so that only you can read it. This ensures confidentiality. In the same way, you can encrypt a message sent to others using their public key, so that only they can read it. Alternatively, and more commonly, a digital signature can be added to an e-mail file, even though the e-mail itself is sent unencrypted. This signature is generated from your private key along with the body of the message, and it is decrypted at the other end using your public key, therefore proving the e-mail could have come only from you. This is known as signing an e-mail message, because it is as if you personally signed it in your own hand- writing, thereby vouching for its authenticity. The e-mail is sent in plain text in case the recipient doesn’t use public key encryption. Setting Up for Encryption To manage your encryption keys, you use the Seahorse application, which comes with Ubuntu. You first generate a key pair (your private key and the public key), and then you can export or publish the public key so others can use it.
- 217. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 181 Generating a Key Pair Regardless of whether you want to use Evolution’s encryption/signing feature or Nautilus’s file-encryption abilities, you must first create a key pair. Here are the steps for doing so: 1. Click Applications ➤ Accessories ➤ Passwords and Encryption Keys. This will run the Seahorse application, as shown in Figure 9-2. Figure 9-2. Seahorse is an easy-to-use management tool for passwords and encryption keys. 2. Click the New button near by the bottom of the program window, or click Key ➤ Create New Key to create a new key pair.
- 218. 182 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 3. The Create a New Key dialog box appears, as shown in Figure 9-3. You are prompted to select which type of key pair should be created: a PGP key or a Secure Shell key. PGP stands for Pretty Good Privacy, which is an industry-standard public key encryption system and is typically used to encrypt and decrypt e-mail and files. That’s the one to select for our purposes here. The Secure Shell key is used as an additional authentication mechanism when connecting to remote computers, as discussed in Chapter 33. Click the Continue button after selecting the PGP Key option. Figure 9-3. Choose PGP Key to create a key pair for e-mail or file encryption. 4. The New PGP Key dialog box appears. Fill in a full name, e-mail address, and optionally, a comment, as shown in Figure 9-4. The e-mail address you use for your PGP key should be the same as the one you used in creating an e-mail account in Evolution (see Chapter 8 for instructions on creating an e-mail account in Evolution). You may also set three advanced options, available in the Advanced Key Options drop-down list:
- 219. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 183 Figure 9-4. Fill in the fields in the New PGP Key dialog box and optionally set advanced options for your keys. • Encryption Type lets you choose the type of cipher for your new keys. The default is DSA ElGamal, and this is the best choice because it will enable you to encrypt, decrypt, sign, and authenticate files and e-mail. DSA and RSA can only sign files and e-mail. • The Key Strength option specifies the strength of your key, set in bits. The lower the key strength, the faster it is to encrypt and decrypt, but lower strength increases the chances of the encryption being broken by intruders (cracked). The higher the key strength, the slower it is to encrypt and decrypt, but as you would expect, it reduces the chances of the encryption being cracked—to the point where larger keys of 2,048+ bits are currently considered unbreakable. This is why the default is set as 2,048 bits, which is a sensible compromise. • The Expiration Date option sets an expiration date on your keys. The default is that the keys are set to never expire. An expiration date is useful if you suspect your private key might fall into the wrong hands (for example, if you use a laptop that could get stolen), as the key will be useful only until the expiration date. If you decide to assign an expiration date, you must create a new key before the old one expires and use the old key to sign your new one, in order to maintain authentication.
- 220. 184 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R ■Note The Key Strength option aids in strengthening your key, because the key strength is based on the type of cipher used together with the size of the key. Sometimes, a key based on a weak cipher can still be made into a strong key by increasing the key length. 5. Click the Create button to create the keys. 6. The Passphrase for New PGP Key dialog box appears. You need to create a passphrase for your new PGP key. A passphrase is a block of text (perhaps a sentence or simply a long stream of characters). You will need to type the passphrase when decrypting files you have encrypted using Nautilus, and encrypted emails you receive using Evolution,, so ensure that the passphrase is easy to remember but hard to guess. Enter your passphrase twice: once in the Password box and again in the Confirm box. As shown in Figure 9-5, the characters won’t appear on the screen. Click OK to continue. Figure 9-5. Enter an easy-to-remember but hard-to-guess passphrase to secure your PGP key. 7. Wait while the PGP key is being created. Depending on the key length you’ve chosen, this may take some time. Once the process is finished, your new PGP key will be listed in the Personal Keys tab of the main Seahorse window, as shown in Figure 9-6.
- 221. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 185 Figure 9-6. Once the PGP key has been generated, it will be listed on the My Personal Keys tab. Exporting Your Public Key As mentioned earlier, your public key must be shared with others if you wish them to be able to encrypt messages or files so that only you can access them, or if you wish them to authenticate any signed e-mail messages you send them. To do this, you use Seahorse to export your public key—effectively, to make it available as a file that can be e-mailed to others, or perhaps stored in a flash disk that is given to other people. ■Note If recipients of signed e-mail don’t have your public key, they won’t be able to authenticate your e-mail signature, but they will still be able to read the message and access any attached files. The signature will probably show up as a .pgp file attached to the e-mail. Have you ever received an e-mail message with a file called something like signature.pgp attached? Now you know what it is!
- 222. 186 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Exporting the key is as simple as running Seahorse (Applications ➤ Accessories ➤ Passwords and Encryption Keys), selecting your key in the My Personal Keys tab, and then clicking the Export Public Key button. You’ll be prompted to save the file to your preferred location, as shown in Figure 9-7. Once the file is saved in your /home directory, you can distribute the file in any way you like. Figure 9-7. Using Seahorse, you can export your public key for distribution. Publishing Your Public Key For wider distribution of your public key, you can publish it in a public key server. This makes it easily available to anyone with Internet access, and it is the preferred method of sharing public keys. The steps to publish your key are as follows: 1. Run Seahorse (Applications ➤ Accessories ➤ Passwords and Encryption Keys) and click Remote ➤ Sync and Publish Keys. 2. The Sync Keys dialog box appears, as shown in Figure 9-8. To be able to sync your key, you need to click the Key Servers button to specify where your key will be published.
- 223. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 187 Figure 9-8. You need to edit your key servers settings to be able to sync your public key to your preferred key server. 3. You will be taken to the Key Servers tab of the Password and Encryption Settings dialog box to customize key server settings. Here, you can specify where to look for keys and where to publish your key. The most popular key server to use is pgp.mit.edu, which you can select from the Publish Keys To drop-down list, as shown in Figure 9-9. Choose your server, and then click the Close button. 4. Back in the Sync Keys dialog box, click the Sync button to publish your key.
- 224. 188 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Figure 9-9. Click the Publish Keys To combo box to select where your key will be published. Importing and Signing Public Keys To be able to encrypt e-mail or files for others, and also verify their signatures, you need to import and then trust their public keys. You can obtain a public key from the person who created it or from other people who have that person’s public key, or look it up from a key server. If you’ve obtained the public key file personally (maybe on a floppy disk or via a USB memory stick) and is it is accessible on your computer, you can import the key by running Seahorse (Applications ➤ Accessories ➤ Passwords and Encryption Keys) and selecting Key ➤ Import. In the file dialog box that appears, browse your folders for the public key file that you would like to import, select that file, and click the Open button. To verify that the key was imported, in the Passwords and Encryption Keys dialog box, click Other Collected Keys and make sure that the key you just imported appears in the list. You can also look for the key from the key server, which is perhaps easier and preferred by most people. To do so, click the Find Remote Keys button in the Passwords and Encryption Keys dialog box. The Find Remote Keys dialog box appears. In the Search for
- 225. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 189 Keys Containing text box, type the name of the person you are looking for and click the Search button. In the search results area, select the key you want to import, and then click the Import button. ■Caution When importing keys from a public key server, you cannot be so sure that these keys are actually owned by persons you want to communicate with in a secure manner. However, one solution for this is the so-called web of trust, whereby people can vouch the authenticity of a key by signing it. See http://en.wikipedia.org/ wiki/Web_of_trust for more information. Once the imported key is in the Other Collected Keys tab, you need to sign the key to be able to send encrypted e-mail messages to the person who owns the key. You can also use the imported key to verify the authenticity of the e-mail messages you have received from that person. To do so, follow these steps: 1. Select the key to sign in the Other Collected Keys tab and click the Sign button. The Sign Key dialog box appears, as shown in Figure 9-10. Figure 9-10. Signing a key is a way of vouching for the key’s authenticity.
- 226. 190 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 2. You can answer the question “How carefully have you checked this key?” based on how you verified the key: Not At All, Casually, or Very Carefully. 3. Your choice for “Others may not see this signature” affects the credibility of the key when you subscribe and sync your relationships to the key server. If you don’t check this option, your trust relationship will be manifested on the key server for the public to see, which is basically saying that you are vouching for the authen- ticity of this person’s key to the public. This is helpful and convenient in reducing the number of keys to sign by others by trusting the keys signed by you. 4. The “I can revoke this signature at a later date” option allows you to revoke the key. This lets you invalidate your trust with the key for reasons such as the key has been compromised and misused or the key is actually a fake. 5. After making your selections in the Sign Key dialog box, click the Sign button to continue. 6. The Enter Passphrase dialog box appears. You need to provide the password you have entered when you created your PGP key. Supply that password and click OK. At this point, the key has been signed and is now listed in the Trusted Keys tab. ■Tip To reduce the number of keys to sign, you can trust the keys signed by the key that you trust. Click the Trusted Keys tab in Seahorse, and then double-click the key to view the key’s properties. When the key’s properties appear, click the Trust tab and check “I have checked that this key belongs to <name> and I trust signatures from <name> on other keys.” Click Close. When you import new keys that are trusted by this key, those keys will automatically be part of the trusted list in the Trusted Keys tab. Encrypting and Decrypting Files After you’ve set up your encryption keys, you start encrypting files, either to store them in encrypted form or to pass them on to others. You can also decrypt your own encrypted files or files encrypted by others that are intended for you. These features are integrated into Nautilus, which makes encryption and decryption easy to accomplish. Encrypting a File To encrypt a file, follow these steps: 1. Open your home directory by clicking Places ➤ Home Folder. 2. Select a file or folder that you want to encrypt.
- 227. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 191 3. Right-click the selected item and select Encrypt, as shown in Figure 9-11. Figure 9-11. Encrypting a file or folder is a context menu option in Nautilus. 4. Select the recipients of the encrypted file, as shown in Figure 9-12. To encrypt a file for yourself, put a check alongside your own key. To encrypt for others, put a check alongside their names. You will need to have imported their public keys, of course. Click OK to continue. ■Caution Remember that the persons you select will be the only ones able to decrypt the file. Once the file is encrypted for someone else, you won’t be able to decrypt it! 5. If you selected to encrypt more than one file, the Encrypt Multiple Files dialog box will appear, as shown in Figure 9-13. You can opt to encrypt each file separately or have the multiple files packed together in an encrypted compressed file, with the compression type of your choice. Select your preferred settings, and then click the OK button to continue.
- 228. 192 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Figure 9-12. You can select multiple recipients of the files or folders you would like to encrypt. Figure 9-13. If you are encrypting multiple files, you can opt to encrypt each file or store all files in a compressed file and have that compressed file encrypted. 6. You should find a new file with a .pgp extension has been created, as showing in Figure 9-14. This can then be passed onto your contact, if the file was encrypted with her public key, or filed away for storage if it was encrypted using your private key. For instructions on how to decrypt the file, see the following section.
- 229. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 193 Figure 9-14. The encrypted file has the extension of .pgp. Decrypting a File To decrypt a file, do the following: 1. Open your home directory by clicking Places ➤ Home Folder. 2. Select the file that you want to decrypt. The file extension is typically .pgp. 3. Double-click the file. 4. Type the passphrase that you entered when creating your key earlier. 5. The file will then be decrypted in the folder where the encrypted file is stored. It will have its original filename.
- 230. 194 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Signing and Encrypting E-Mail After you’ve set up your encryption keys, you can send e-mail with your digital signature to signify the authenticity of your e-mail, as well as encrypt e-mail so that the intended recipient is the only one capable of reading your mail and vice versa. As long as you’ve configured your PGP key, imported keys to trust, and configured your Evolution account, integrating this kind of security is seamless. To sign and/or encrypt an e-mail message in Evolution, do the following: 1. In Evolution, select File ➤ New ➤ Mail Message to compose a new e-mail message. 2. The Compose Message dialog box appears. Fill in the To field, Subject field, and the message. 3. Click Security. To mark the e-mail for signing, check PGP Sign. To mark the e-mail for encryption, check PGP Encrypt. 4. Click the Send button to send the e-mail. 5. If you chose to sign the message, the Enter Passphrase dialog box appears. Enter the password you assigned when you created your PGP key, and then click OK. Your e-mail will be sent, signed and encrypted as you specified. Validating E-Mail To be able to validate signed e-mail messages you have received from other people, you need to import their public keys and then trust them using Seahorse. When you receive signed e-mail messages, a note indicating the authenticity of the e-mail signature is placed at the very bottom of the message, as shown in Figure 9-15.
- 231. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 195 Figure 9-15. A note stating that the e-mail is signed with a valid signature is placed at the very bottom of the message. Decrypting E-Mail To decrypt e-mail received from other people, your PGP key needs to be configured in Seahorse. You will need to use your key to decrypt the e-mail. Just select the e-mail message you wish to decrypt, and you will see the Enter Passphrase dialog box, as shown in Figure 9-16. Enter the password to your PGP key and click OK. You will now be able to view the e-mail in plain text form.
- 232. 196 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Figure 9-16. You need to supply the password of your PGP key to decrypt e-mail sent to you. Common-Sense Security As you start to understand how Ubuntu works, you’ll become more and more aware of common-sense methods that will protect your system. However, we’ll outline a few of these now to get you started: Entering your password: Be very wary if you’re asked to enter your password (outside initial login, of course). You’ll be asked to provide your password when following many of the configuration steps within this book, for example, and this is acceptable and safe. But if you’re asked to do so out of the blue, then you should be suspicious. If the root password prompt dialog box (shown in Figure 9-17) appears when you run a file that shouldn’t really need root permissions, such as an MP3 or OpenOffice.org file, you should treat the situation with caution. Installing new software: Be careful in choosing programs to download and install. Because Linux works on the basis of open-source code, theoretically, anyone can tamper with a program and then offer it for download by the unwary. This very rarely happens in real life. Even so, it’s wise to avoid downloading programs from unofficial sources, such as web sites you find online via a search engine and whose authenticity you cannot totally trust. Instead, get software from the web site of the people who made it in the first place or, ideally, from the official Ubuntu software repositories (discussed in Chapter 28).
- 233. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 197 Figure 9-17. Beware if you’re asked to type your password out of the blue and for no apparent reason. Updating your system: Always ensure your system software is completely up-to-date. As with Windows, many Ubuntu programs have bugs that lead to security holes. Crackers target such vulnerabilities. Downloading the latest versions of Ubuntu software ensures that you not only get the latest features, but also that any critical security holes are patched. As with most versions of Linux, updating Ubuntu is easy and, of course, it’s also free of charge. You’ll learn how to get online updates in the next section. Locking up your PC: Limit who has physical access to your computer. Any Ubuntu system can be compromised by a simple floppy boot disk, or even by just selecting the rescue mode entry on the boot menu, which will provide the user with root access to the computer. This is for obvious reasons; the idea of a boot disk or the rescue mode is to let you fix your PC should something go wrong, and you cannot do this if you’re blocked from accessing certain files. When Linux is used on servers that hold confi- dential data, it’s not uncommon for the floppy and CD-ROM drives to be removed, thus avoiding booting via a boot disk. Such computers are also usually locked away in a room or even in a cupboard, denying physical access to the machine. Online Updates The Ubuntu notification area (the equivalent of the Windows system tray) at the top right of the screen contains a program that automatically monitors the package repositories and tells you when updates are available. This is an extension of the Synaptic Package Manager program called Update Manager. If you haven’t yet updated your system, this icon will have probably turned into a white arrow pointing down, enclosed in an orange star. This is informing you that updates are available. In addition, each time you boot, you will see a speech bubble telling you that updates are available. When your system is completely up-to-date, the icon will not be visible.
- 234. 198 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Clicking the Update Manager icon opens the Update Manager window, as shown in Figure 9-18. To go online and grab the updated files, simply click the Install Updates button at the bottom-right side of the window. You will probably be asked to enter your root password, because system files will need to be altered. Figure 9-18. You’ll be informed if your system is in need of updates, and the Update Manager program can take care of everything for you. Be aware that some updates can be large and might take some time to download, particularly if you’re doing it for the first time after installing Ubuntu. Once the downloads have finished, you probably won’t need to reboot unless the kernel file has been updated. If you do need to reboot, or if the update requires you to take any other action (such as logging out and then back in again), the Update Manager icon in the notification area will turn into an information icon, or into two encircled arrows. You should then click the icon to see what action you’re advised to take.
- 235. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 199 APPLICATION SECURITY WITH APPARMOR A sad fact of computing life is that all software applications have bugs of some kind. Some of these are not serious (in fact, they may remain invisible), but some might lead to abnormal program termination, data corruption, or even system failure. The worst kind of bugs provide “back doors” into your system that can be used by crackers to wreak havoc. Software developers fix reported bugs as quickly as possible (and one benefit of the open-source approach is that solutions can come from third-parties, speeding up the process), but the gap between discovering the bugs and providing a fix is a time when systems are vulnerable to attack. Taking advan- tage of such a vulnerability is called a zero-day exploit. Fortunately, Ubuntu and several other types of Linux distributions have a clever built-in security mechanism called, AppArmor, which oversees software applications and ensures they don’t do things that they shouldn’t. Effectively, AppArmor “fences in” applications so they go only where they should within the system. AppArmor is relatively new to Ubuntu. Although it’s integrated into the underlying systems, it has yet to be made easily available to the user for configuration. Currently, the only way to configure AppArmor under Ubuntu is by using the command line. This will probably change in the future. AppArmor is primarily intended to protect server systems—large computers that store and distribute data to others. As such, AppArmor is not particularly aimed at desktop users, although there is no reason why the intrepid desktop user can’t make use of it AppArmor works on the principle of least privilege, which means that each application is granted only the bare minimum of system resources it requires to run properly. Should the application prove to have a flaw that means it can be compromised, the damage would therefore be limited in its scope. AppArmor implements this scope by way of profiling each application. A profile is a configuration file that contains details about what the application may do. The default installation of Ubuntu contains several profiles stored in /etc/apparmor.d. Several more profiles can be added by installing the package apparmor-profiles using Synaptic Package Manager. Additionally, new applications you install may come with their own AppArmor profiles. Once additional profiles are installed, they are auto- matically utilized. Each application can run in one of two modes: • Enforce mode: In this mode, AppArmor implements the permissions and capabilities listed in the profile. If the application tries to access a file or use a capability that is not listed in the profile, the operation will not be permitted. • Complain mode: In this mode, AppArmor records the violations incurred by an application when it violates the rules imposed in the profile and stores them in the system log. These logs can be used later for creating or updating a profile of an application. To determine which profiles and programs are running in enforce or complain mode, open a terminal window (Applications ➤ Accessories ➤ Terminal) and issue the command sudo apparmor_status. To learn more about how to use AppArmor with Ubuntu, including how to create your own applica- tion profiles, see https://help.ubuntu.com/community/AppArmor.
- 236. 200 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Configuring the Ubuntu Firewall A firewall is a set of programs that protects your PC when it’s online. It does this by watching what data attempts to enter your PC from the Internet and allowing in only what it is sure is secure (which usually is what you’ve asked for). It also attempts to close off various aspects of your Internet connection, so that crackers don’t have a way in should they target your system. The benefit of configuring the firewall is that even if your system has security vulnera- bilities because of buggy software, crackers will find it a lot harder to exploit them across the Internet. When someone attempts to probe your system, it will appear to be virtually invisible. ■Caution Although software firewalls such as the one built into Linux offer a high level of protection, it’s best to use them in concert with a hardware firewall, such as that provided by most DSL/cable broadband routers (curiously, some of these routers actually use Linux’s iptables software as well). Many security experts agree that relying solely on a software firewall to protect a PC affords less than the optimal level of protection. Although Ubuntu includes a powerful firewall in the form of iptables, you’ll also need a program that can manage it. Here, we’ll show you how to use Firestarter, available from the Ubuntu software repository, for this purpose. The configured built-in firewall really does provide very strong protection. ■Note Power users might choose to configure Ubuntu’s firewall without installing Firestarter. The command-line tools iptables and ufw are installed by default and are preferred by some system administra- tors. Iptables is a configuration tool used to manage Netfilter, the feature in the kernel that handles the firewall. Unfortunately, with iptables, you need to understand how TCP/IP works and learn cryptic commands to be able to make full use of it. But armed with that knowledge, you can turn your PC into a full-fledged, budget software router with features that rival or surpass hardware routers. Ufw (for “uncomplicated firewall”) is a new configuration tool that also manages the Netfilter firewall. It’s easier to use than iptables because a fire- wall rule in ufw is usually terse and humanly readable. For more information about ufw, refer to its man page (choose Applications ➤ Accessories ➤ Terminal to open a terminal window and issue the command man ufw).
- 237. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 201 Installing Firestarter Let’s get started by downloading and installing Firestarter. Follow these steps: 1. Select System ➤ Administration ➤ Synaptic Package Manager. You’ll need to enter your password when prompted. Click the Search button, and enter firestarter as a search term. In the list of results, locate the program, and click the check box. Then choose to install the package, and click Apply on the Synaptic toolbar. 2. Once the desktop is back up and running, select System ➤ Administration ➤ Firestarter. When you run Firestarter for the first time, it will walk you through a wizard. 3. Click the Forward button to continue the wizard beyond the introductory page. 4. The first step asks which network interface Firestarter should configure, as shown in Figure 9-19. If you use an Ethernet card, have a wireless card, or attach a broadband modem directly to your computer, the answer will probably be eth0 or wlan0. However, if you use a modem, the answer is ppp0. Figure 9-19. Firestarter includes a wizard to walk you through the basics of firewall configuration. 5. Put a check in the “IP address is assigned via DHCP” box, unless you’re using a dial- up modem. If you are using a dial-up modem, select “Start the firewall on dial-out” check box. After making your choices, click the Forward button.
- 238. 202 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 6. You’re asked if you want to enable Internet connection sharing. This allows you to turn your computer into an Internet router and can be very useful in certain circum- stances. You can activate this later on by running the wizard again. Click Forward to continue. ■Note To rerun the wizard, simply click Firewall in Firestarter’s main window, and then click Run Wizard. 7. The wizard will finish. Click the Save button to save your settings to disk. In addition, ensure the Start Firewall Now box is checked. After this, the Firestarter main window opens. Configuring Firestarter Firestarter works by controlling the data that goes into and out of your computer via your Internet or network connection. By default, it blocks every type of uninvited inbound connection but allows every type of outbound connection. Whenever you click a link on a web page, your computer sends a request for data to the web server hosting the web page. Within a few milliseconds, that data will be sent to your computer. This is an inbound data connection. The Linux firewall is clever enough to realize that the data was requested by you, so it is allowed through. However, any unin- vited connections are turned away. If, out of the blue, someone attempts to connect to your computer via the popular Secure Shell (SSH) tool, as just one example, he won’t be allowed to make that connection. This is a good thing, because it makes your computer secure. Crackers are turned away whenever they try to connect, no matter how they try to connect. But in some circumstances, allowing uninvited connections is useful. For example, if you create a shared folder for other computers in your office to connect to, they will frequently make uninvited inbound connections to your computer whenever they want to grab a file. And if you want to make use of SSH to connect to your computer remotely, you will need to allow such incoming connections. Therefore, Firestarter lets you allow through certain types of inbound connections. In the terminology of Firestarter (and many firewall programs), outbound traffic is any kind of data originating on your computer that is sent out on the network and/or Internet. By default, Firestarter allows out all data, no matter what it is. This is described as a permissive policy. But Firestarter can be configured to block all outgoing connections apart from those you configure Firestarter to allow. This is described as a restrictive policy and can be useful in blocking certain types of programs that “phone home” with personal data about you, such as spyware.
- 239. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 203 ■Note Unlike with Windows, we’ve never heard of a Linux program that contains spyware that “phones home” in this way. Nevertheless, a cautious attitude often pays dividends. A restrictive policy can also prevent certain types of viruses and worms from spreading. The downside of a restrictive policy is that you must configure Firestarter to take into account every type of outgoing data connection that you do want to allow through, such as those for web browsers, instant messaging programs, and so on. You can configure Firestarter by clicking the Policy tab in the main program window. Click the Editing drop-down list, and choose to configure either the inbound traffic policy or the outbound traffic policy. ■Note Firestarter is used only to configure the built-in firewall and doesn’t need to be running for the fire- wall to work. Once you’ve finished configuration, you can quit the program. You’ll need to use it again only if you wish to reconfigure the firewall. Setting Inbound Rules For most users, Firestarter’s default inbound traffic policy will be perfectly acceptable. It configures the firewall to disallow all uninvited incoming data connection, apart from certain diagnostic tools, such as ping, traceroute, and so on. You can choose to disallow those as well, as described shortly in the “Turning Off Diagnostic Services” section. You might wish to allow an incoming connection if you intend to connect to your computer via SSH from a remote location or if you have a shared folder created for other computers in your office. It’s a must if you’re running the BitTorrent file sharing appli- cation. Additionally, if you run a web, e-mail, or other type of server on your computer, you will need to allow the correct type of incoming connection here. Here’s how to set inbound connection rules: 1. In the Firestarter main window, click the Policy tab. Select Inbound Traffic Policy in the Editing drop-down list. 2. Right-click in the second box on the Policy tab (with the headings Allow Service/ Port/For), and then select Add Rule. 3. The Add New Inbound Rule dialog box appears. In the Name drop-down list, select the type of outgoing connection you want to allow, as shown in Figure 9-20. To allow others to access shared folders on your computer, select Samba (SMB). To allow SSH or BitTorrent connections to your computer, select the relevant entry from the list. Selecting the service will automatically fill in the Port box, which you shouldn’t alter unless you know exactly what you’re doing.
- 240. 204 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Figure 9-20. Creating an inbound rule enables computers to connect to your PC uninvited. 4. If you know the IP address of the computer that’s going to make the incoming con- nection, you can click the IP Host or Network radio button, and then type in that , address. However, the default of Anyone will allow anyone using any IP address to connect to your computer. 5. Click Add. Back in the main Firestarter window, click the Apply Policy button on the toolbar. ■Note You’ll need to return to Firestarter whenever you activate new services on your computer. For example, in Chapter 12, we will look at accessing Windows shares across a network, and you’ll need to enable SMB incoming and outgoing access for this to work. In Chapter 33, we will look at using the SSH service, which will have to be allowed through the firewall. In other words, securing your computer isn’t something you can do once and then forget about. It’s a continual process.
- 241. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 205 Setting Outbound Rules By default, Firestarter allows all types of outgoing connections and, as with its incoming connections policy, this is by no means a bad choice for the average user. It’s certainly the option that involves the least fuss. However, by opting to go with a restrictive traffic policy, you can completely control what kind of data leaves your computer. Any type of data connection that isn’t authorized will be refused; as far as the program sending the data is concerned, it will be as if your computer did not have a network or Internet connection. Here’s how to set outbound connection rules: 1. In the Firestarter main window, click the Policy tab. Select Outbound Traffic Policy in the Editing drop-down list. 2. Click the Restrictive by Default, Whitelist Traffic radio button. 3. In the second empty box at the bottom of the Policy tab (which has the Allow Service/ Port/For headings), right-click and select Add Rule. 4. The Add New Outbound Rule dialog box appears. In the Name drop-down list, select the type of data connection you wish to allow. At the very least, you should select HTTP. This will allow your web browser to operate correctly (it’s also needed to allow the Synaptic Package Manager and Update Manager programs to work). HTTPS should also be allowed—this is the secure version of HTTP used to access the likes of online banking sites, online shopping services, and some online e-mail services. You should also add a rule for POP3 and another for SMTP, without which your e-mail program won’t work. Selecting the type of service will fill in the Port box automatically. You shouldn’t alter this unless you know what you’re doing. ■Note You can only add one rule at a time. You’ll have to repeat steps 3 and 4 several times to add rules for each service you want to allow. 5. Click the Add button to add the rule. Back in the Firestarter main window, click Apply Policy. 6. Test your settings with a program that uses the services you’ve just authorized. ■Caution If you created an inbound rule, you’ll need to create a matching outbound rule. If you created an incoming rule for BitTorrent, for example, you’ll need to create an outgoing rule for BitTorrent, too. You can delete both incoming and outgoing rules by right-clicking their entries in the list.
- 242. 206 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Turning Off Diagnostic Services Certain network tools can be misused by crackers to break into a computer or just cause it problems. In the past, the traceroute and ping tools, among others, have been used to launch denial-of-service (DoS) attacks against computers. Ubuntu is set to allow these tools to operate by default. If you want to adopt a belts- and-suspenders approach to your computer’s security, you can opt to disable them. If you don’t know what ping and traceroute are, you’re clearly not going to miss them, so there will be no harm in disallowing them. Here’s how: 1. In the Firestarter main window, click Edit ➤ Preferences. 2. On the left side of the Preferences window, click ICMP Filtering. Then click the Enable ICMP Filtering check box, as shown in Figure 9-21. Don’t put a check in any of the boxes underneath, unless you specifically want to permit one of the services. Figure 9-21. By deactivating traceroute, ping, and other services, you can add extra protection to your PC. 3. Click the Accept button to finish.
- 243. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 207 PARANOIA AND SECURITY There’s a fine line between security and paranoia. Using Firestarter gives you the opportunity to ensure your system is secure, without needing to constantly reassess your system for threats and live in fear. When considering your system security, remember that most burglars don’t enter a house through the front door. Most take advantage of an open window or poor security elsewhere in the house. In other words, when configuring your system’s security, you should always select every option and extra layer of security, even if it might not appear to be useful. You should lock every door and close every window, even if you don’t think an attacker would ever use them. Provided a security setting doesn’t impact your ordinary use of the computer, you should select it. For example, deactivating the ping response of your computer might sound like a paranoid action, but it’s useful on several levels. First, it means your computer is less easy to detect when it’s online. Second, and equally important, it means that if there’s ever a security flaw in the ping tool (or any software connected with it), you’ll be automatically protected. This illustrates how you must think when configuring your system’s security. Try to imagine every situation that might arise. Remember that you can never take too many precautions! Adding Virus Scanning to Ubuntu As mentioned in the chapter introduction, Linux (and therefore Ubuntu) are not currently affected by viruses. Nobody knows the true number of viruses affecting Linux, but it is almost certainly less than 50, and that’s the total since Linux was created back in the early 1990s! At the time of this writing, there are no Linux viruses in the wild, which is to say, actually infecting computers. However, there can be no room for complacency. It’s very likely virus writers will turn their attention to Linux in the coming years as it becomes a popular desktop solution. This section describes how to use ClamTk, which is a graphical front end for the Clam AntiVirus (ClamAV) program (www.clamav.org). ClamAV is an open-source, industrial- strength antivirus scanner designed to work on all kinds of computers and operating systems. It detects Windows and even Macintosh viruses, as well as Linux and Unix viruses. This has obvious benefits if you share files with Windows users—you can inform your friends and colleagues if any files they give you are infected (and bask in the warm feeling that arises when you realize the viruses can’t affect your system!). ClamAV’s only drawback is that it is limited to virus scanning. It isn’t able to disinfect files, like the more sophisticated virus scanners available for Windows. However, it should be noted that disinfection rarely works very well, as discussed in the ClamAV FAQ (www.clamav.org/support/faq).
- 244. 208 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Installing ClamTk You can install ClamAV and ClamTk through the Synaptic Package Manager, as follows: 1. Select System ➤ Administration ➤ Synaptic Package Manager. You’ll need to enter your password when prompted. 2. Click the Search button, and enter clamtk as a search term. 3. In the list of results, locate the program, and click the check box. 4. Choose to Mark for Installation. 5. When prompted to mark additional required changes, click the Mark button. This ensures ClamTk, ClamAV, and their dependencies will be installed. 6. Click the Apply button on the Synaptic toolbar. Updating the ClamAV Database Before you scan for viruses, you should update the virus database. This should be done every time you scan and can be done using the ClamTk program. ■Note When you installed ClamAV, it added a background service called freshclam, which periodically downloads updates for ClamAV’s database. However, manually updating before scanning is also a good idea, to ensure you’re always using the very latest version of the database at the time of scanning. In order to update the database, ClamTk needs to access system files, so it needs to be run with root powers. To do this, open a terminal window (click Accessories ➤ Terminal), type gksu clamtk, and press Enter. Enter your password when prompted. (gksu is like sudo, in that it gives the program you specify administrator powers, except that it’s used for GUI applications.) Click Help ➤ Update Signatures. Updating can take a few moments, and you’ll see a progress report in the ClamTk window beneath the toolbar. When Clam AV is first installed, it automatically grabs the latest database file, so ClamTk will probably report it’s already up-to-date the first time an update is run. It’s also possible to update ClamAV without using ClamTk—just type sudo freshclam in a terminal window. Note that when updating using the freshclam command, you might see a warning that your version of ClamAV is out-of-date. This is because the Ubuntu packages are sometimes a version or two behind the main release. However, this isn’t a significant issue, and ClamAV will still be able to scan for viruses, and virus definitions will stay up-to-date.
- 245. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 209 Scanning for Viruses With Windows virus scanners, you might be used to performing whole system scans. This isn’t advisable with ClamAV, because it simply isn’t designed for that task. Instead, ClamAV is designed to scan user files, such as documents. ■Note ClamAV is actually primarily designed to be used in concert with a mail server and to scan incoming or outgoing mail attachments. See the About page at the ClamAV web site (www.clamav.org/about). You can try performing a full system scan, but in our tests, several false positives were iden- tified, meaning that ClamAV identified innocent files as containing viruses. Because of this, it’s best to use ClamAV to scan just your personal files for viruses, which is to say, those within your /home directory. Bear in mind that this is where all files you import to your computer will likely to be installed, so this is where an infection is most likely to be found. To scan your personal files, follow these instructions: 1. Start ClamTk by clicking Applications ➤ System Tools ➤ Virus Scanner. 2. Before starting the scan, it’s useful to ensure hidden files are scanned. After all, a virus is likely to try to hide, rather than make its presence obvious! This can be done by clicking Options ➤ Scan Hidden Files (.*). ■Note Resist the temptation at this stage to select Delete Infected Files from the Options menu. This is because ClamTk might return a false positive—a file that it thinks contains a virus but that is actually perfectly safe. It’s better to deal with viruses after they’ve been found on a one-by-one basis, rather than automatically. 3. Although there’s a button on the toolbar that lets you scan your /home directory with a single click, it won’t scan recursively. That means it won’t scan any folders (or folders of folders) within your /home directory, so it isn’t of much use. To perform a recursive scan of your /home directory, click File ➤ Recursive Scan. Then click the OK button in the Select a Directory (Recursive Scan) dialog box. This will select your /home directory. Of course, you can also select any other folders to scan at this stage. 4. The scan will start. Depending on the quantity of files in your /home directory and their sizes, it may take some time. You’ll see a live status report beneath the toolbar, showing which file is currently being scanned. When the status line reads “Scanning Complete,” the scan has finished. Running along the bottom of the window will be a complete status report, showing the number of files scanned and the number of viruses found, if any. See Figure 9-22 for an example. If any viruses are found, move on to the next section.
- 246. 210 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R Figure 9-22. You’ll see a live status report detailing which files are being scanned below the toolbar in the ClamTk program window. Dealing with Infections If any viruses are found, they will be listed in the ClamTk program window. The type of virus that’s allegedly infecting the file will be listed in the Status column. See Figure 9-23 for an example. Figure 9-23. If ClamTk finds a virus, it will be listed in the main program window. Look in the Status column for the name of the virus.
- 247. CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R 211 Be aware that ClamTk sometimes reports a virus when it simply can’t access a partic- ular file, perhaps because of file permission problems. If this is the case, you’ll see Access Denied or Can’t Open Directory in the Status column. You can ignore these files. ■Tip If you really want to scan files that require superuser permissions, you can run ScanTk with superuser powers. Open a terminal window (Applications ➤ Accessories ➤ Terminal), and type gksu scantk. Entries in the list can be right-clicked and quarantined or deleted. Quarantining is where the file is moved to a special directory for inspection or deletion later on. You can manage quarantined files using the Quarantine ➤ Maintenance menu. While the impulse might be to simply delete the file, you should be cautious. Be aware that ClamTk might be reporting a false positive—a file that it thinks is infected with a virus, but which isn’t. This is rare but can happen. If you do find a file you know is a false posi- tive, right-click it and select Quarantine. Then click Quarantine ➤ Maintenance. In the list, select the file and click False Positive. This will ensure it’s ignored next time you scan. So what should you do if you find a file is infected? First, don’t panic. Remember that practically all viruses that ClamAV is likely to find are targeted at Windows systems and don’t affect Linux. ■Note If we assume there are 120,000 viruses for Windows and 50 for Linux, then in theory, there’s 99.999% chance that any virus ClamAV finds will be a Windows virus! Next, find the name of the virus in the Status column, and look it up online to learn more about it. This is the point at which you’ll learn if it’s a Linux virus and, if so, its poten- tial impact on your system. In the example in Figure 9-23, the virus ClamTk found is called Exploit.IFrame.Gen-1. In addition to searching for Exploit.IFrame.Gen-1, we also added “ClamAV” to the search string to see if there was any specific information about this virus being found by the scanner, and check if the report was a false positive. You can hover your mouse over the filename in the scanner window to see its path. If the file is located in your Firefox cache, as in this example, then there’s nothing to worry about, and the file can be deleted with impunity—just right-click and select Delete from the menu. In fact, the Firefox cache is where you’re most likely to find virus infections, because this is where all the files are temporarily downloaded when you’re browsing the web (including HTML files, images, and so on). But, once again, you should remember that most nefarious web sites that attempt to spread virus infections are targeted at Windows users, usually via security holes within Internet Explorer. As a Linux user using the Firefox web browser, you have far less to worry about.
- 248. 212 CHAPTER 9 ■ HOW TO SEC URE Y OUR COMPUTE R WEB BROWSER SECURITY It’s not enough to rely on antivirus software for safe web browsing. In Firefox, you can tweak settings to enhance the security of browsing. However, note that improved security sometimes equates to reduced features, which can be quite frustrating. To set security options in Firefox, select Edit ➤ Preferences. Settings on the following tabs affect browser security: • Content: You can disable pop-up windows and disable JavaScript and Java. Note that it’s quite unlikely that you would want to completely disable JavaScript, since many modern web sites make heavy use of it (including online shopping sites and web-based e-mail, such as Google’s Gmail). You could add exceptions for certain web sites, but an easier way is to use a third-party plug-in called NoScript (http://noscript.net). This tool allows you to disable JavaScript, Java, Flash, and other plug-ins that could potentially be harmful to Firefox on all web sites by default. You can easily reenable these scripts on each web site that you trust through the NoScript applet, located in the lower-right corner of the browser window. • Privacy: You can customize retention of browser history, cookies, and private data. If privacy is of utmost importance, you can check the “Always clear my private data when I close Firefox” check box in the Private Data section, click the Settings button, and select which of the items to delete when you close Firefox. • Security: You can customize attack site and forgery detection, passwords, and warning messages. You should customize these settings based on how you use the Web. For example, it’s obvious that the “Warn me when sites try to install add-ons” option should be checked, since malware is distributed this way. And if you transact business on the Web, the “Tell me if the site I’m visiting is a suspected forgery” option offers added protection from getting duped. Summary In this chapter, we’ve looked at what threats your system faces and how security holes can be exploited by malicious interests. You learned about measures you can take to protect your system, such as updating it online, using AppArmor to guard against errant applica- tions, configuring the system’s firewall, using encryption for e-mail and file privacy and authentication, installing an antivirus program, and customizing web browser security. We also discussed some common-sense rules you can follow to keep your system safe. In the next chapter, we move on to looking at how your Ubuntu system can be person- alized and how to set up everything to suit your own preferences.
- 249. CHAPTER 10 ■■■ Personalizing Ubuntu: Getting Everything Just Right I f you’ve read this book from Chapter 1, by this stage you no doubt have become comfort- able with Ubuntu. You’ve started to realize its advantages and are on the way to making it your operating system of choice. But things might still not be quite right. For instance, you might find the color scheme is not to your taste. Or perhaps the mouse cursor moves a little too fast (or too slowly). Maybe you simply want to stamp your individuality on your system to make it your very own. That’s what this chapter is all about. We look at personalizing Ubuntu, so that you’re completely happy with your user experience. To do this, we will thoroughly examine the GNOME desktop and explore its potential. Changing the Look and Feel Ubuntu is similar to Windows in many ways, but the developers behind it introduced improvements and tweaks that many claim make the software easier to use. For example, Ubuntu offers multiple virtual desktops—long considered a very useful user-interface feature that seems to have passed by Microsoft. ■Note The virtual desktop feature also passed by Apple for a long time. However, it was recently included in OS X Leopard, in the form of Spaces. The Ubuntu desktop also moves the programs menu to the top of the screen, leaving the whole width of the screen at the bottom to display taskbar buttons. This is very sensible, because the buttons don’t look cramped when more than a handful of applications are open. However, if you’re not satisfied with Ubuntu’s out-of-the-box look and feel, you can change it. 213
- 250. 214 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT You might be used to changing the desktop colors or wallpaper under Windows, but Ubuntu goes to extremes and lets you alter the look and feel of the entire desktop. Every- thing from the styling of the program windows to the desktop icons can be altered quickly and easily. Altering the Theme Ubuntu refers to the look of the desktop as a theme. Because it’s built on the GNOME desktop, Ubuntu allows you to radically personalize your desktop theme. Several different themes come with the distribution, and you can download many more. Each lets you change the way the windows look, including the buttons and the icon set (although some themes come without additional icons). However, unlike Windows themes, GNOME themes don’t usually change the fonts used on the desktop, and the wallpaper will probably remain broadly the same. You can change these manually, as described in the “Setting Font Preferences” and “Changing the Wallpaper” sections a bit later in this chapter. To alter the theme, select System ➤ Preferences ➤ Appearance. Then it’s simply a matter of choosing a theme from the list on the Theme tab in the Appearance Preferences dialog box, as shown in Figure 10-1. A useful hint is to open a Nautilus file browser window in the background (Places ➤ Home Folder), so you can see how the changes will affect a typical window. ■Note The default Ubuntu theme is called Human and is designed to represent the skin tones of the world’s population. This is intended to reflect Ubuntu’s mission of being accessible to everyone, no matter where or who they are. In fact, there are three variations of the theme available in the Appearance Preferences dialog box: Human, Human Clearlooks, and Human Murrine. All vary the design very slightly. Try them to see which you like best! Our favorite themes are Clearlooks and Mist, largely because they’re simple and uncom- plicated. Remember that you’ll be working with the theme on a daily basis, so it should be practical and not too distracting. Those miniature close, minimize, and maximize buttons might look stylish, but they’re useless if they’re so small that you can’t reliably click them with your mouse.
- 251. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 215 As well as changing the overall theme, you can also modify individual theme compo- nents and even download more theme components. Figure 10-1. Ubuntu comes with several theme choices. Changing Individual Theme Components You can alter the five aspects that constitute a GNOME theme: the controls (sometimes known as widgets), color scheme, window borders, icons, and mouse pointer. To make changes to a theme, select it on the Theme tab of the Appearance Preferences dialog box (see Figure 10-1), and then click the Customize button. You will see the Customize Theme dialog box, as shown in Figure 10-2. Click each tab to see your choices:
- 252. 216 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Figure 10-2. You can customize a theme by choosing your own controls, colors, window border, icons, and mouse pointer. Controls: These are the elements you click within dialog boxes and windows: buttons, scroll bars, check boxes, radio buttons, and so on. The chief difference between one set of controls and another relates to their 3D effect—some are inset against the back- ground, and some appear to be prominent. Some controls are shiny, and some appear flat. Additionally, some are rounded, and some are square. Rounded controls somehow feel more friendly; squared controls tend to feel more businesslike. Colors: You can set the background and text color of windows, input boxes, selected items, and tooltips. However, note that controls nearly always come with their own color schemes, which override any changes you make to color settings. A few controls not only override color settings, but also do not support tweakable color schemes. Examples include the High Contrast Inverse and High Contrast Large Print Inverse controls. Window Border: The options on this tab control the borders of program windows and dialog boxes. Particular attention is paid to the top of the window, where the program name appears along with the minimize, maximize, and close buttons.
- 253. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 217 Icons: This tab lets you control which icon set is in use. An icon set includes icons for everything you see on the screen or in menus, including folders, the Trash, programs, hard disks, network servers, and so on. Selecting a new icon set will change all icons. ■Note The Icons tab of the Customize Themes dialog box doesn’t let you change the icons for specific desktop items. This can be done by right-clicking the icon, selecting Properties from the menu that appears, and then clicking the icon preview button at the top left of the dialog box. Note that most stock icons are stored in /usr/share/icons. Any icons you change individually in this way won’t be affected by changes made to the icon set. Pointer: On this tab, you can set the appearance of the mouse pointer. Aside from the pointer’s design, you can change its size (although this is not supported on all mouse pointers) by adjusting the Size slider. A larger mouse pointer might help the visually impaired. A small mouse pointer would be appropriate for low-resolution or small screens like those on ultraportable laptops. You will see thumbnail previews of each style. As soon as you click each option, it will be applied automatically to the currently open windows. To preview the effects fully, the best policy is to keep a Nautilus window open (Places ➤ Home Folder). When you’ve made your choices, you can save the theme for further use. Click Close in the Customize Theme dialog box, and then click the Save As button in the Theme tab of the Appearance Preferences dialog box. You’ll need to give the theme a name and, if you wish, a short description for future reference. By putting a check in the Save Background Image box, the theme will also remember the wallpaper that’s in use. Once saved, the theme will be available for selection from the Theme tab, where the themes are listed in alphabetical order. If you checked Save Background Image, when you select the theme in the future, the wallpaper will be suggested at the bottom of the Theme tab. To select it, just click the Apply Background button. If you don’t save the theme, as soon as you select another one, the changes you made will be lost. Installing Additional Components If you get tired of the built-in possibilities, you can download additional theme components, such as window borders and controls, to enhance your desktop experience. Two popular web sites (among others) that you can visit are GNOME Art (http://art.gnome.org) and GNOME-Look (http://gnome-look.org). The GNOME Art web site is officially supported. GNOME-Look tends to be driven more by enthusiasts. Both offer a massive choice of theme components.
- 254. 218 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT ■Caution Be warned that there is sometimes artistic nudity on some of the wallpapers available from GNOME-Look. The GNOME Art site, shown in Figure 10-3, gives you access to just about every theme ever created for GNOME. In fact, the site also contains wallpaper selections, icons, and much more. All of the offerings are free to use. Figure 10-3. The GNOME Art site contains the latest themes, and you can use all of them with Ubuntu.
- 255. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 219 Installing new theme components is easy, and the instructions here work just as well for the GNOME-Look site. If you wish to install a new window border, for example, click the link to browse the examples, and when you find one you like, click to download it. It will be contained in a .tar.gz or .tar.bz2 archive, but you don’t need to unpack it (be sure to select the Save File option from the Firefox dialog box). Simply select System ➤ Preferences ➤ Appearance, and click the Install button on the Theme tab. Then browse to the downloaded theme and click Open. You can also just drag the .tar.gz or .tar.bz2 file onto the Theme tab of the Appearance Preferences dialog box for an instant installation. Either way, you’ll be asked if you want to use the new theme component immediately. You can say yes, or choose it later from the Customize Theme dialog box (opened by clicking the Customize button in the Appearance Preferences dialog box), where it will be available on the relevant tab. You can delete the downloaded file when you’re finished. ■Note The same principle of sharing that underlines the GPL software license is also usually applied to themes. This means that one person can take a theme created by someone else, tweak it, and then release it as a new theme. This ensures constant innovation and improvement. Changing the Wallpaper It’s easy to switch wallpapers under Ubuntu. You can also add your own wallpaper and set wallpaper size, or select a background color if you don’t wish to use wallpaper. These changes can be made from the Background tab of the Appearance Preferences dialog box (System ➤ Preferences ➤ Appearance), shown in Figure 10-4. ■Tip The default backgrounds provided by the GNOME project include several wonderful nature pictures and some cool patterns. However, they aren’t included out of the box with Ubuntu. To install them, search for gnome-backgrounds in the Synaptic Package Manager. Also, don’t forget that the GNOME Art web site (http://art.gnome.org) offers many wallpaper packages for download.
- 256. 220 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Figure 10-4. Wallpapers can be zoomed or scaled to fill the screen using the Style drop-down list (this figure includes wallpapers from the gnome-backgrounds package). Switching and Adding Wallpaper On the Background tab, you can select from a short list of different wallpapers, including the following: No wallpaper: This is the leftmost choice. To change the background color, click the color box in the Colors section at the bottom of the dialog box. Elephant: This is an image of an elephant’s hide rendered with brown shades. Heron: This is the default wallpaper. It’s an image of an abstract heron painted with the Ubuntu logo color on the foreground, with swirls of brown shades on the background. Ubuntu Simple: This shows swirls of different brown shades in the background.
- 257. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 221 ■Tip You can right-click the desktop and choose Change Desktop Background to access the same menu of wallpaper choices. If you want to use a picture of your own as wallpaper, click the Add button, and then browse to its location. Choosing Wallpaper Style From the Style drop-down list on the Background tab, you can select from the following choices: Centered: This option places the wallpaper in the center of the screen. If the wall- paper is not big enough to fill the screen, a border appears around the edge. If it’s bigger than the screen, the edges of the wallpaper are cropped off. Fill Screen: This option forces the picture to fit the screen, including squashing or expanding it if necessary (known as altering its aspect ratio). If the wallpaper isn’t in the same ratio as the screen, it will look distorted. Most digital camera shots should be okay, because they use the same 4:3 ratio as most monitors (although if you have a widescreen monitor, a digital camera picture will be stretched horizontally). Scaled: Like the Fill Screen option, this option enlarges the image if it’s too small or shrinks it if it’s too big, but it maintains the aspect ratio, thus avoiding distortion. However, if the picture is in a different aspect ratio than the monitor, it may have borders at the edges. Zoom: Like Fill Screen, this option forces the picture to fit the screen, without any borders at the top and bottom. However, it avoids altering the aspect ratio. If the wall- paper isn’t the correct aspect ratio then parts of the top/bottom or left/right of the image may be cropped off. Tiled: If the picture is smaller than the desktop resolution, this option simply repeats the picture (starting from the top left) until the screen is filled. This option is primarily designed for patterned graphics.
- 258. 222 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Specifying Wallpaper Colors From the Colors drop-down list on the Background tab, you can select from the following choices: Solid Color: This option fills the wallpaper with one uniform color. You are provided one color button to set the color. Horizontal Gradient: This option fills the wallpaper with a one color on the left, blending with another color from the right. You are provided two color buttons to specify both colors. Vertical Gradient: This option fills the wallpaper with a color on top, blending with another color at the bottom. You are provided two color buttons to specify both colors. To specify the color or colors that will be used, click the color buttons beside the Colors drop-down list. The Pick a Color dialog box will appear. Select a color by clicking or drag- ging the color wheel. You can also use the eyedropper tool to obtain any color displayed on your screen, including anywhere on the desktop or in open windows. Simply click the tool on the color. If none of this works for you, you can manually provide the hue, saturation, value (HSV) or red, green, blue (RGB) values or color name by specifying the combination of hexadecimal digits (this will be familiar to web designers). A preview of your selection is shown at the bottom left of the dialog box in the right color preview bar. The previous color that you selected is shown in the left color preview bar. Click the OK button when you’ve chosen your preferred color. Setting Font Preferences Ubuntu lets you change the fonts that are used throughout Ubuntu (referred to as system fonts). You can also alter how they’re displayed. To change a system font, open the Appearance Preferences dialog box (System ➤ Preferences ➤ Appearance), and click the Fonts tab, as shown in Figure 10-5. Click the button next to the system font you want to change, and then choose from the list. You can also set the font point size, perhaps to make the labels beneath icons easier to read. By clicking the entries in the Rendering section of the Fonts tab, you can change how fonts look on your monitor. This will alter the antialiasing and hinting of the font. Anti- aliasing softens the edges of each letter to make them appear less jagged. Hinting affects the spacing and shaping of the letters. Used together, they can make the on-screen text look more pleasant. Try each Rendering setting in sequence to see which looks best to you (the text in the dialog box will update automatically to show the changes). Nearly everyone with a TFT-based screen, including notebook users, finds the Subpixel Smoothing option best.
- 259. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 223 Figure 10-5. You can alter the way fonts appear on screen by using the Fonts tab of the Appearance Preferences dialog box. BYTECODE HINTING Two font-hinting subsystems are available under Ubuntu: Autohinting and Bytecode Interpreter. There’s a lengthy debate about which produces the best results. Personally, we prefer to use the Bytecode Inter- preter, because we believe it leads to the cleaner fonts, but others say Autohinting is better in this regard. Some people say that the Bytecode Interpreter is worth using only if you make heavy use of the Microsoft TrueType Core Fonts (see Chapter 21 to learn how to install these fonts). Follow these steps to switch between the Bytecode Interpreter and Autohinting systems: 1. Open a terminal window (Applications ➤ Accessories ➤ Terminal). 2. In the terminal window, type the following: sudo dpkg-reconfigure fontconfig-config 3. On the first screen of the configuration program, select Native to activate the Bytecode Interpreter. Alternatively, you can choose Autohinting or even None, which will turn off the hinting system.
- 260. 224 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT 4. On the next screen, you can select whether subpixel rendering is activated. This is useful only for TFT screens (including notebooks). Select Automatic, or if you use a TFT monitor and want to ensure the option is activated, select Always. 5. The third screen offers the option of using bitmap fonts. These are fonts that, unlike the TrueType fonts used within the rest of Ubuntu, don’t scale beyond their original sizes. There’s no harm in enabling them, because they can sometimes be useful as system fonts. 6. After making this choice, the configuration program will quit. Then you must update the changes you’ve made by using the following command: sudo dpkg-reconfigure fontconfig 7. Once the program has finished configuring the software, restart your X server by logging out and then back in again. Configuring General Interface Options Ubuntu lets you modify the way the menus and toolbars are displayed. To configure these interface options, open the Appearance Preferences dialog box (System ➤ Preferences ➤ Appearance) and click the Interface tab. This tab offers three options: Show icons in menus: Here, you have the option to display/hide the icon placed before each item in menus used throughout the GNOME desktop and GNOME appli- cations, such as the Gedit text editor. It’s best to leave the icons visible, since visuals help describe the purpose of each menu item, but ultimately it’s a matter of personal choice. Menus are certainly smaller if they have no icons. You can get an idea of the changes when you click the File or Edit faux menu in the Preview section. Editable menu shortcut keys: By enabling this option, you can add, modify, or delete a keyboard shortcut of a menu item in most GNOME applications. To add or modify a keyboard shortcut in an application, click the menu containing the option, hover your mouse pointer over the menu item of interest, and then press your desired key or a combination of keys. To delete a keyboard shortcut, just hover your mouse pointer over the menu item you want to remove and press the Delete key.
- 261. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 225 ■Note Bear in mind that some applications included with Ubuntu, such as OpenOffice.org, are not GNOME applications, so they may not allow you to edit their shortcut keys. Those that are GNOME desktop applica- tions will say so in the Help ➤ About dialog box. Toolbar button labels: This will affect where the text in toolbar buttons appears: below or beside the icon (buttons in dialog boxes are not affected). You can also select to display only icons in buttons or only text. Select the desired option from the drop- down list, and then view the results in the faux buttons in the Preview section. ■Tip The Preview section of the Appearance Preferences dialog box is useful for showing the effects of the changes, but to see how what you’re changing affects a real application, we suggest opening Gedit and leaving it in the background behind the Appearance Preferences dialog box. Gedit is a standard GNOME appli- cation that ably demonstrates the GNOME look and feel. Using Desktop Visual Effects Provided your computer is compatible, and your computer is utilizing the correct graphics card drivers (see the “Installing 3D Drivers and Activating Desktop Visual Effects” section in Chapter 8), you can opt for visual effects on your Ubuntu desktop. Three basic settings for desktop visual effects are available: None, Normal, and Extra. You can switch between them by clicking System ➤ Preferences ➤ Appearance, and then selecting the Visual Effects tab of the Appearance Preferences dialog box. As you might expect, the None option turns off the effects. This can be useful if your computer slows down when the effects are in use. The Normal setting implements the standard set of effects, offering subtle but not overly noticeable changes to the interface, and is the default choice if your computer is capable of effects. The Extra setting adds a handful more effects, largely for fun but also with some offering productivity benefits. Additionally, you can opt to install some extra software that gives you even more fine- grained control over what effects are used. The following sections discuss each of these choices for visual effects.
- 262. 226 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Using the Standard Visual Effects The standard visual effects, used when the Normal setting is chosen, add shadows to windows and also add minimize animations so that programs literally appear to shrink into the panel. You might also notice that inactive windows and their title bars are trans- lucent. Additionally, when a window is opened or closed, you see the window appear or fade away, respectively. There are several more subtle visual effects, requiring particular key combinations, as follows: Visually impaired tools: To zoom into any area of the screen, press the Windows key and turn the mouse wheel to adjust the zoom level. You can also press Windows+1, 2, or 3 key to zoom into three different levels, respectively. Additionally, you can invert the colors (like a photographic negative) either for the entire desktop or just for the current program window. Press Windows+N to toggle the window as a negative, as shown in Figure 10-6. Press Windows+M to toggle the entire screen as a negative. Figure 10-6. You can filter colors of windows or the entire screen as a visual aid.
- 263. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 227 Virtual desktops: If you use virtual desktops, as described in Chapter 7, you’ll be pleased to know that the desktop effects system enhances the experience. Press Windows+E to get a miniature view of your virtual desktops arranged in a grid, as shown in Figure 10-7. (Note that the figure shows four virtual desktops; the default setting on an Ubuntu system is only two desktops.) To switch to a virtual desktop, just point your mouse to the virtual desktop of choice and double-click. You can also switch from one virtual desktop to another from the desktop by moving the mouse pointer to an empty area of the desktop and then turning the mouse wheel, which will cause the desktops to slide sideways out of view. Press Ctrl+Alt+arrow key for the same effect. As you navi- gate from one virtual desktop to another, a grid where each cell represents each virtual desktop will appear in the center of the screen, and a cell will be highlighted for a short period of time to let you know which virtual desktop you are on right now. Figure 10-7. Pressing Windows+E gives you a miniature view of your virtual desktops.
- 264. 228 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Application Switcher: As well as moving between virtual desktops, you can navigate through applications with the Application Switcher. Just press Alt+Tab to see the list of running applications in miniature view, arranged horizontally in the center of the screen, as shown in Figure 10-8. Press the Tab key repeatedly until you find the desired applica- tion at the center of the list. Release the Alt key to switch to the desired application. Figure 10-8. To use the Application Switcher, hold the Alt key and press the Tab key until you find the desired application at the center of the list. Using the Extra Visual Effects By selecting the Extra option from the Visual Effects tab of the Appearance Preferences dialog box, you can enable a handful more visual effects. These include all the features of the Normal effects and then some. For starters, you will notice that when you drag or maximize a window, the window becomes “wobbly”—part of it will linger behind the rest of the window, as if affected by momentum. The Application Switcher effect is also enhanced, and will display previews of open programs in 3D form, as shown in Figure 10-9.
- 265. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 229 Figure 10-9. The 3D Application Switcher is displayed by pressing Windows+Tab. Personalizing Visual Effects If you are unsatisfied with the default choices for visual effects, you can install the CompizConfig Settings Manager tool. This gives you complete control over the Compiz Fusion system, which provides Ubuntu’s visual effects (see Chapter 8). Bear in mind that some of these settings are very technical, and little provision is made for those who are new to the effects subsystems. You can install the tool using the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager). You’ll need to enter your password when prompted. Click the Refresh button to reload the repository listings. Then click the Search button and enter compizconfig-settings-manager as a search term. In the list of results, locate the program and click the check box. Then choose to Mark for Installation. When prompted to mark additional required changes, click the Mark button. Finally, click the Apply button on the Synaptic toolbar. Once the tool is installed, select System ➤ Preferences ➤ Advanced Desktop Effects Settings. The CompizConfig Settings Manager window will appear, as shown in Figure 10-10.
- 266. 230 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Figure 10-10. The CompizConfig Settings Manager tool offers advanced customization of visual effects in Ubuntu. Compiz Fusion works by packaging each effect as a plug-in, and CompizConfig Settings Manager simply lets you switch these plug-ins on and off, as well as change their settings. One of the most important settings you can change for most plug-ins is the keyboard combination that activates them. On the right side of the main window is the list of plug-ins. You can enable them by checking the check box beside them. You can also change the settings of the plug-in by clicking the plug-in name and icon. This opens the settings page for the plug-in, with a single or few tabs containing configuration settings. You’ll also see a brief description of the effect on the left side of the program window. When you’ve finished, click the Back button. In the left column, you can use the Filter text box at the top to search for a particular plug-in; the search results will be displayed on the right side of the window. Beneath the Filter section is the Category listing, which groups the plug-ins by purpose. Clicking any category will update the list of plug-ins on the right side of the window. To return to the main program window, click the Back button. The categories are as follows:
- 267. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 231 All: All available plug-ins will be displayed in the main window. General: This section contains just the General Options plug-in, which provides configuration settings for keyboard shortcuts for some of the effects, virtual desktop size, display settings, transparency settings for windows, and more. Some of the settings are quite technical and are perhaps best left alone unless you know what you are doing. Accessibility: This section contains plug-ins that will help people with physical disabili- ties use the desktop more conveniently with visual aids. It contains plug-ins that make the active window more visible, magnify the screen for visibility issues, change colors, and aid in finding the mouse pointer. To find out what keyboard combination is required to activate any particular effect, click the plug-in’s icon to change its settings and look to the button alongside each heading. Desktop: This section contains plug-ins that enhance desktop behavior. If you use virtual desktops, plug-ins such as Desktop Cube and Rotate Cube can turn these into sides of a 3D cube that rotates when you switch desktops, as described earlier. Desktop Wall and Desktop Plane render these workspaces as if they were part of one surface. You might notice that some plug-ins have the same functionality; CompizConfig Settings Manager will offer to disable any that do when you select a new option. Plug- ins such as Viewport Switcher and Expo make it easier to preview and navigate work- spaces. Show Desktop and Fade to Desktop add special effects to clear the desktop of clutter. Like many effects plug-ins, these tie in with the existing features of Ubuntu— in this case, the Show Desktop feature and button, located at the bottom left of the desktop by default. Effects: This section contains plug-ins that add special effects to certain aspects of the desktop. Some you have already seen, such as Wobbly Windows, which is part of the Extras scheme. But others are more extreme. For example, there are several plug-ins that add eye candy to windows, such as Blur Windows, Animations, Fading Windows, and Window Decoration Reflection. 3D Windows, Cube Gears, and Cube Reflection add decorations as you traverse the 3D cube. Other plug-ins affect the entire screen, such as adding water puddles and wipers with the Water effect or adding fire on the screen with the Paint Fire on the Screen effect. Some need keyboard combinations to activate them—to find out what these are, click the plug-in icon.
- 268. 232 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Extras: This section includes effects useful for developers, as well as some plug-ins that simply could not be filed elsewhere. These include displaying the Compiz Fusion splash screen after logging in, benchmarking the performance of Compiz Fusion, viewing a thumbnail of a window by pointing the mouse at its entry on the Taskbar, and taking a screenshot. One notable plug-in is Annotate, which enables you to draw on the screen. This can be useful for demos and presentations when stressing key points. Image Loading: These plug-ins are technical and are required in the background to load image formats and text that will be used by other plug-ins for rendering. Do not disable them. Utility: This section contains mostly plug-ins that work behind the scenes and a few that work externally. Unless you know what you are doing, you shouldn’t change any of these settings or disable any of the plug-ins. Window Management: These plug-ins enhance window management functionality. For example, some of the plug-ins project the Taskbar in different ways, such as 2D, in a ring, and in a 3D ring. Another example is the Group and Tab Windows plug-in, which you can use to group and tab windows. Uncategorized: These include plug-ins that do not belong to any group. Note that, in our tests, selecting this was like selecting All—all the plug-ins were displayed. We had to scroll to the bottom of the window to see the Uncategorized plug-ins. Beneath the Categories list is the Preferences option, which is used for adjusting internal settings of Compiz Fusion, such as the back-end profile and including and excluding plug-ins. You can leave these settings untouched. Lastly, the Advanced Search option allows you to search through options within plug- ins. The search results will first be narrowed down to a list of plug-ins in the main window. After selecting from the list of plug-ins, a new list will be displayed with narrowed down results containing a list of grouped options. After selecting from the list of grouped options, you’ll see a narrowed down list of options that you can use to configure the plug-in’s settings. USING DESKTOP WIDGETS If you are a fan of Windows Vista’s Sidebar, Macintosh OS X’s Dashboard, or Yahoo!’s Widgets, you can use something similar under Ubuntu, called screenlets. To use these, you need to install the Screenlets package. This requires you to first install CompizConfig Settings Manager, as described in the main text. Then use that program to enable the Widgets Layer plug-in (look under the Desktop category). Finally, use the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager) to search for and install the Screenlets package.
- 269. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 233 Run Screenlets by clicking System ➤ Preferences ➤ Screenlets. Once the Screenlets Manager window appears, select the screenlet you would like to enable by clicking it and then clicking the Launch/Add button. Following this, you should be able to click and drag the screenlet. Right-click a screenlet and select Properties to change its settings. You have two choices regarding how and when the screenlet appears: • Keep the widget on the screen at all times (the default), perhaps arranging widgets on the right side of the screen as with Windows Vista. • Add the widget to the Widget Layer, which is just like OS X’s Dashboard and will appear only when you hit F9 (and will subsequently disappear when the mouse is clicked). To add the widget to the Widget Layer, right-click it, select Window, and then click Widget. Of course, you can have the best of both worlds, keeping some widgets on the screen and putting lesser-used items on the Widget Layer. If you would like to add more screenlets than those available by default, go to http:// screenlets.org. Under the Downloads head, click the “third-party screenlets” link. Once you’ve downloaded the screenlet, you can install it by clicking Install Screenlet in the Screenlets Manager window and then navigating to the downloaded screenlet. Configuring Input Devices Mouse and key repeat speeds are personal to each user, and you may find the default Ubuntu settings not to your taste, particularly if you have a high-resolution mouse such as a gaming model. Fortunately, changing each setting is easy. You’ll find the relevant options under the System ➤ Preferences menu. Configuring Mouse Options Select System ➤ Preferences ➤ Mouse to open the Mouse Preferences dialog box, which has General and Accessibility tabs. On a laptop, you might also see the Touchpad tab. General Mouse Settings On the General tab of the Mouse Preferences dialog box, shown in Figure 10-11, you can configure the following options:
- 270. 234 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Figure 10-11. The Mouse Preferences dialog box lets you tame that mouse. Mouse Orientation: This option lets you set whether the mouse is to be used by a left- handed or right-handed person. Effectively, it swaps the functions of the right and left buttons. Locate Pointer: This option allows you to show where the mouse is by displaying a ripple surrounding the mouse pointer when you press the Ctrl key. This can be useful for partially sighted people who may not be able to locate the cursor on a busy desktop. Acceleration: This setting controls how fast the mouse moves. Whenever you move the mouse, the pointer on the screen moves a corresponding amount. However, the cursor actually increases in speed the more you move your hand (otherwise, you would need to drag your hand across the desk to get from one side of the screen to the other). This is referred to as acceleration. If you set the acceleration too high, the pointer will fly around the screen, seemingly unable to stop. If you set it too slow, you’ll need to ramp the mouse several times to make it go anywhere.
- 271. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 235 Sensitivity: This setting controls how quickly the acceleration kicks in when you first move the mouse. Choosing a higher setting means that you can move the mouse rela- tively quickly before it starts to accelerate and cover more screen space. A low setting means that acceleration will begin almost as soon as you move the mouse. Higher sensitivity settings give you more control over the mouse, which can be useful if you use image-editing programs, for example. Drag and Drop: This setting determines the amount of mouse movement allowed in a click-and-drag maneuver before the item under the cursor is moved. It is designed for people who have limited dexterity and who might be unable to keep the mouse perfectly still when selecting an item. In such cases, a large threshold value may be preferred. Double-Click Timeout: This is ideal for people who are less physically dexterous, because the double-click speed can be slowed down. On the other hand, if you find yourself accidentally double-clicking items, you can speed it up. Test your settings by double-clicking the light bulb image. Changes are made as each setting is adjusted, so to test the new settings, simply move your mouse. Accessibility Settings The settings on the Accessibility tab can help people with physical disabilities use the mouse. However, to enable these features, you need to enable Assistive Technologies in Ubuntu first, as follows: 1. Open the Assistive Technologies Preferences dialog box (System ➤ Preferences ➤ Assistive Technologies). 2. Check the Enable Assistive Technologies box, and then click the Close and Log Out button (this is necessary to start the background services). 3. Select Log Out in the Shutdown dialog box, and then log back in again, when prompted. 4. After logging in, return to the Accessibility tab of the Mouse Preferences dialog box (System ➤ Preferences ➤ Mouse). From the Accessibility tab, you can enable simulated secondary click and dwell click options. Checking “Trigger secondary click by holding down the primary button” simu- lates a right-click when you hold the left-click for a certain amount of time (useful for those having trouble right-clicking). This amount of time can be configured by moving the Delay slider to the left for a faster response or to the right for a longer delay.
- 272. 236 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT A dwell click allows you to simulate a mouse-click action after the mouse pointer has been left idle for a certain amount of the time. To enable this feature, check “Initiate click when stopping pointer movement.” You can set the length of the idle time by moving the Delay slider to the left for less idle time or to the right for a longer delay. The Motion Threshold setting determines the amount of mouse movement allowed while the mouse is still considered idle (useful for those who might be unable to control small movements of their hands). Moving the Motion Threshold slider to the left makes the mouse pointer sensitive; moving it to the right makes the pointer less sensitive. You can choose two types of dwell click: Choose type of click beforehand: This option automatically clicks the mouse when the mouse pointer is idle. If you want to choose the type of mouse click each time, put a check in the box beside Show Click Type Window. This will show a floating window, from which you can select various types of clicks, such as single-click, double-click, and so on. Alternatively, you can choose the mouse click from the Dwell Click applet instead. (Applets are discussed in the “Working with Applets” section later in this chapter.) Choose type of click with mouse gestures: This option allows you to choose the type of mouse click to execute when the mouse movement is idle by moving the mouse in a certain direction, usually up, down, left, or right. Just wait until the mouse turns into a cross and then move the mouse. Once you’ve performed the movement, the mouse will return to its original location before it was moved. All of the mouse movements can be customized by changing the gestures in the drop-down lists for Single Click, Double Click, Drag Click, and Secondary Click. Touchpad Settings The Touchpad tab appears on laptops only. You can set the following options: Enable touchpad: This allows you to enable or disable the touchpad. Disabling the touchpad is useful, because typing while inadvertently touching the touchpad will change the position of the cursor, which is a pain. Enable mouse clicks with touchpad: This allows you to simulate a mouse click by tapping the mouse pad. Enable vertical and horizontal scrolling on your touchpad: This is similar to the effect of turning the scroll wheel. For vertical scrolling, a small region at the top-right corner down to the bottom-right corner of the touchpad becomes the vertical scroll region. For horizontal scrolling, a small region at the lower-left corner to the lower- right corner of your touchpad becomes the horizontal region.
- 273. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 237 Changing Keyboard Settings Select System ➤ Preferences ➤ Keyboard to open the Keyboard Preferences dialog box. This dialog box has five tabs: General, Layouts, Accessibility, Mouse Keys, and Typing Break. General Settings The General tab offers Repeat Keys settings and a Cursor Blinking slider. You can alter the rate of key repeat, which can be useful if you often find yourself holding down the Back- space key to delete a sentence; a shorter setting on the Delay slider and a faster setting on the Speed slider can help. However, if you get the settings wrong, you may find double characters creeping into your documents; typing an f may result in ff, for example. Modifying the Cursor Blinking slider setting may help if you sometimes lose the cursor in a document. A faster speed will mean that the cursor spends less time being invisible between flashes. Layouts Settings On the Layouts tab, you can choose your keyboard model, add an alternative keyboard layout, and configure layout options, as shown in Figure 10-12. Typically, the generic keyboard works fine for most setups. However, if you want to make full use of the extra keys on your keyboard, such as Mail, Web, Power, Sleep, Suspend, and so on, you should select your keyboard model. If you write in two different languages on your keyboard, it may be helpful to be able to switch between them. Click the Add button, and select the second language from the list. To switch from one language to another, you can add the Keyboard Indicator applet in a panel and toggle from one language to another by clicking the applet. (Applets are discussed in the “Working with Applets” section later in this chapter.) The Layout Options dialog box, accessed by clicking the Layout Options button, lets you select from a multitude of handy tweaks that affect how the keyboard works. For example, you can configure the Caps Lock key to act like a simple Shift key, or you can turn it off altogether. You can configure the Windows key so that it performs a different function, too. Put a check alongside the options you want after reading through the exten- sive list.
- 274. 238 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Figure 10-12. You can have more than one language setting in place for a keyboard, which is handy if you need to type in a foreign language. Accessibility Settings As with the mouse, there are also accessibility options for keyboard users to help people with physical disabilities. On the Accessibility tab, you can configure the following settings: General: You have an option to enable/disable accessibility features from the keyboard. Sticky keys: As its name suggests, this feature holds down keys such as Shift, Ctrl, and Alt while you press another key on the keyboard. This is useful for people unable to press more than one key at once, but who need to use keyboard shortcuts, Ctrl+S, within applications. To enable sticky keys, check the Simulate Simultaneous Keypresses option. You can test sticky keys by running Nautilus (Places ➤ Home Folder). Try pressing Alt and F sequentially; Nautilus will open the File menu as if you pressed those keys simultaneously. If you would like to disable sticky keys on the fly, without having to use this dialog box, select “Disable sticky keys if two keys are pressed together.” You can test this by pressing Ctrl+Alt. A Sticky Keys Alert dialog box will appear to prompt you to disable sticky keys.
- 275. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 239 Slow keys: This feature controls the reaction rate of keys. By moving the Delay slider to the left, the reaction rate of the keys becomes faster. By moving the slider to the right, the reaction rate of the keys becomes slower, to the point that you would need to hold the key for certain amount of time for it to be considered as a key press. This has obvious uses for people with limited dexterity in their fingers. ■Tip To enable/disable sticky keys at any time, just press the Shift key five times to toggle the sticky keys feature. To enable/disable slow keys, hold the Shift key for 8 seconds. Bounce keys: This feature controls the repetition of letters on the screen when the same key is accidentally pressed. By moving the slider to the left, the repeat rate will be quicker; moving it to the right adds time for the key to be repeated. At the bottom of the dialog box is a text box for typing to test the settings you’ve just configured. You can also enable sound notifications by clicking the Notifications button. These notifications will let you know when the keyboard accessibility features have been enabled or disabled. You can set sound alerts for accessibility in general, sticky keys, slow keys, and bounce keys. Mouse Keys Settings The mouse keys feature lets you use your numeric keypad to control the mouse pointer. By checking “Allow to control the pointer using the keyboard” and pressing the Num Lock key, you can move the mouse pointer by typing from the numeric keypad. With mouse keys enabled, the 5 key both simulates a mouse click and acts as the center of a directional wheel surrounding it. The 1, 2, 3, 4, 6, 7, 8, and 9 keys simulate mouse direction. Some numeric keypads have arrows on them to indicate this. You can move the Acceleration slider to adjust the time it takes while pressing the mouse keys for the mouse movement to reach full speed. The Speed slider sets the distance offset of the mouse pointer when you press a mouse key. By moving the Speed slider left, the mouse pointer covers a smaller distance when you press a mouse key, giving you the illusion that the mouse movement is slower. By moving the Speed slider right, the mouse pointer covers a larger distance when you press a mouse key, giving you the illusion that the mouse movement is faster. The Delay slider determines the amount of time to press the mouse keys before the mouse pointer starts to move. You can set the delay by moving the Delay slider to the left for a quicker response time and to the right for a longer delay.
- 276. 240 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Typing Break Settings The Typing Break tab features a function that can force you to stop typing after a prede- termined number of minutes. It does this by blanking the screen and displaying a “Take a break!” message. Note that a notification area icon will appear before the break time to give you advanced warning of the lockout. Creating Keyboard Shortcuts Ubuntu lets you define your own keyboard shortcuts for just about any action on the system. To create a shortcut, select System ➤ Preferences ➤ Keyboard Shortcuts. In the dialog box, search through the list for the action you want to create a shortcut for, click it, and then press the key combination you want to use. For example, you might locate the Volume Up and Volume Down entries in the list, click each, and press Ctrl+left arrow and Ctrl+right arrow. Then you will be able to turn the volume of your sound card up or down by holding down Ctrl and tapping the left or right arrow key, respectively. ■Caution Be careful not to assign a shortcut to a popular key. It might be nice to make Totem Media Player appear when you hit the spacebar, for example, but that will mean that it will start up several times whenever you type a sentence in a word processor! Also be aware that some key combinations are used by applications. Within OpenOffice.org’s Writer, for example, the Ctrl+left/right arrow key combination moves you from word to word in a paragraph. If you define those combinations as shortcuts, you will no longer have this functionality. An example of a handy shortcut is to configure your /home folder to appear whenever you press Ctrl+Home. This can be done by locating the Home Folder option under the Desktop heading. Personalizing Login Options You can even personalize the login screen under Ubuntu. This is known technically as the GNOME Display Manager, or GDM. To access its configuration options, select System ➤ Administration ➤ Login Window. ■Note On our test system, the GNOME Display Manager took a surprisingly long time to start up, and initially we thought it had crashed. You may need to wait 1 or 2 minutes for it to appear.
- 277. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 241 You will see the Login Windows Preferences dialog box, which has six tabs: General, Local, Remote, Accessibility, Security, and Users. General Settings The General tab allows you to customize the following settings: Hide visual feedback in the password entry: When you check this option, the pass- word mask (the circles that appear when you type in a password field) is not displayed as you type your password when you are logging in. This prevents people from deter- mining the length of your password by looking at your screen as you type. Disable multiple logins for a single user: When you check this option, a user will have only one session to work on, even if he logs on multiple times, to save on computing resources. Default session: This is basically, the type of session that will run when you log in. You have five options: • The Run Xclient Script option allows you to run a customized script, if it exists, or the system-wide script (if the customized script does not exist) that specifies which programs you would like to run during startup. This is for very advanced users. If you wish to control which programs start when GNOME does, it’s best to use the Sessions program instead (System ➤ Preferences ➤ Sessions), as described in Chapter 30. • The GNOME option allows you to run the GNOME desktop environment during startup. GNOME is Ubuntu’s default desktop environment, but you can also install other desktop environments such as KDE and Xfce by using the Synaptic Package Manager, as described Appendix D. • The Secure Remote Connection option allows you to connect to a remote desktop with a secure/encrypted connection. Once you log in to your computer, you will be prompted to specify the IP address or hostname of the remote desktop, user- name, and password. At this point, the desktop that will appear on your screen is the remote desktop and not the local desktop. The main requirement is that the remote desktop has the ssh server program installed (see Chapter 33 for instruc- tions on how to install the ssh program). • The Failsafe GNOME and Failsafe Terminal options are used for troubleshooting if you fail to log in normally.
- 278. 242 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT GtkRC file: This option is useful if you want to customize the theme for GDM, but this is again only for advanced users. It’s easier to customize the login screen by using the options on the Local tab, as described next. Clock notation: You have the option to display the time in 24 or 12 hour notation on the login screen. The Auto setting will match the rest of the system preferences for display of 12/24 hour time. Local Settings On the Local tab, you can configure settings for the look and feel of the login screen. These settings do not affect remote logins (those that take place over a network or even the Internet). Local logins are the standard type that you use to access Ubuntu while sitting in front of the computer. The options are as follows: Style: In the Style drop-down list, you can choose the type of login screen people logging in locally will see: • Themed, which is to say one that includes a pretty graphic such as the Ubuntu logo • Themed with Face Browser, which shows a pretty graphic and user-selected photographs (see the “Changing Your Login Picture” section later in this chapter) • Plain, which shows a simple plain color background with the GNOME logo • Plain with Face Browser, which is like the Plain option but also shows user- selected photographs Theme: In the Theme drop-down list, you have two choices on how many login screen themes you would like to use. The first choice is Selected Only, which means you will use only one login theme from the selection. The second choice is Random from Selected, which means you can select several login screen themes, and the login theme that will be displayed is randomly selected from those themes. Assuming that you select Themed from the Style drop-down list, you can select the actual theme you want from the Theme list. The default choice is Human, which features the Ubuntu logo and color scheme, but you can also select from a handful of other designs. Show Actions Menu: By unchecking this option in the Menu Bar section, you can deactivate the Actions menu on the login screen, so the user will not be able to restart or shut down the computer from the login screen. This can be useful for security purposes.
- 279. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 243 Include Hostname Chooser (XDMCP) Menu Item: By unchecking this option, you can remove the option from the Actions menu that allows users to log in to a remote system. Custom: By selecting Custom under the Welcome Message heading, you can have the login screen display a custom sentence, but only if the Theme allows this—the default Human login screen doesn’t. By clicking the Add button, you can install new login screen themes, which, as with other GNOME theme components, can be downloaded from http://art.gnome.org. Remote Settings The Remote tab controls X Display Manager Control Protocol (XDMCP) logins. This is considered a very insecure method of remotely accessing Ubuntu and should be disabled. We discuss more secure options for remotely accessing Ubuntu in Chapter 33. Accessibility Settings The Accessibility tab lets you activate GNOME’s accessibility tools during login, which can aid those with physical disabilities. If you’ve chosen Plain or Plain with Face Browser as your login theme (on the Local tab), you’ll see the option Allow Users to Change Fonts and Colors. This allows you to change the font and colors of the login screen by selecting a different theme from the Theme menu of the login screen. Additionally, you can alter the sound that is heard when the login prompt is ready to take input. By putting a check alongside Login Successful and Login Failed, you can also choose sound effects to accompany those two actions. Security Settings The Security tab lets you alter login settings that might present a security risk to your system. The following options are available: Enable automatic login: This check box lets you do away with the login screen completely when Ubuntu starts up and go straight to the desktop. Simply put a check in the box, and provide the login username. This presents obvious security issues, but if you’re the only person using the computer and if it’s located in a secure location, you might want to choose this option. Enable timed login: This option lets you select a user who will be logged in by default after a given period. This is useful if you want to present the opportunity to log in as a different user but also want to have the failsafe of logging in automatically, too.
- 280. 244 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Login retry delay: This option controls how long Ubuntu will pause after an incorrect username or password has been entered on the login screen. Increasing this value can put an irritating block in the way of anyone who intends to try various random username or password combinations to break into your system. But it can also be annoying to you should you mistype and then have to wait! Minimal UID: This option allows only users whose UIDs are higher than the one listed to log in. Allow local system administrator login: This option controls if the root user is allowed to log in, something which is considered a security risk. (This is only relevant if the root user account is enabled, which it isn’t by default under Ubuntu.) Enable debug messages to system log/Deny TCP connections to X Server: These two options relate to security, and it’s unlikely you’ll ever need to use them. Allow login if all write permissions on user’s home directory: Since GDM saves user settings on your home directory, the permissions settings provide the conditions for GDM to access those files. If you receive error messages about problems accessing user settings such as the .drmc file when logging in, you may want to try to make GDM’s permissions lax by selecting this option. However, the better solution is to change the ownership and permissions of the affected files (see Chapter 14 for instructions on how to change permissions and ownership of files). The Configure X Server button lets you configure the X server that starts by default. Changing these settings could stop your computer booting to a GUI, so you shouldn’t alter the settings unless you know exactly what you’re doing. Users Settings On the Users tab, you can specify which users are offered as choices within GDM if the Face Browser option is activated on the Security tab. Bear in mind that Linux has many system user accounts that aren’t designed to allow logins. The “Include all users from /etc/passwd (not for NIS)” option is checked by default. This is a convenient setting, since all user accounts will be displayed in the login screen. except for usernames whose user IDs are lower than the Minimal UID setting in the Secu- rity tab and users listed in the Exclude list. To reduce the list of users, you can add users to the Exclude list by clicking the Add button under the Exclude list. When the Add User dialog box appears, provide the username of the user to exclude from the list, and then click the Add button. However, if there are more users to exclude than users you would like to include on the login screen, it’s more appropriate to add users in the Include list instead. Uncheck “Include all users from /etc/passwd (not for NIS)” so that you can add users to the Include list. Then click the Add button under the Include list. When the Add User dialog box appears, provide the username of the user you wish to include, and then click the Add button.
- 281. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 245 The Default Face and Global Face Dir options provide the default pictures of users in the face browser, if these users did not define a face image for themselves (see the next section). There is already a custom default face image per theme, but you can change the default image by providing the link to your preferred image in the Default Face option. The Global Face Dir, on the other hand, provides the directory where system-wide face images are stored. The default face image directory is /usr/share/pixmaps/faces, so you would need to add new default images there. To be able to use these face images in the face browser, the image must have the same name as the username of the user. For example, if you have a user who name is jane, the image filename must be renamed to jane followed by the image extension. Many image types are supported—you can use .gif, .tif, .png, and other files. ASSISTIVE TECHNOLOGIES You might know about the Accessibility tools under Windows, which help people with disabilities use the computer. It’s possible to use an on-screen magnifier, so that users can better see what they’re typing or reading, for example. Under the GNOME desktop, the Accessibility tools are referred to as Assistive Technologies. To use them, select System ➤ Administration ➤ Preferences ➤ Universal Access ➤ Assistive Technology. Click the check box alongside Enable Assistive Technologies. Here is what’s offered: • The Screenreader uses a speech synthesizer to announce whatever you click on, as well as what- ever you type. To alter its settings, click the Settings button. Note that this also lets you configure any Braille output devices that might be connected to the computer, and it lets you configure the on-screen magnifier. • The On-screen Keyboard can be used with a mouse, but is most useful when an alternative input device is used, such as a touch screen. As well as presenting a virtual keyboard, it shows the options on screen as a series of large and easy-to-activate buttons. Changing Your Login Picture If, when configuring the login options on the Local tab of the Login Window Preferences dialog box, as described in the previous section, you selected the Happy GNOME with Browser theme, or activated the Plain with Face Browser style, the login screen will display a picture alongside your name, as shown in Figure 10-13. You can click this and type your password to log in. You might be familiar with a similar system under Windows XP or Vista, or Mac OS X.
- 282. 246 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Figure 10-13. The face browser lets each user choose an icon to appear on the login screen. Users can choose their own login pictures by clicking System ➤ Preferences ➤ About Me. The About Me dialog box is designed for users to enter their personal details, such as their addresses, but they can also simply use it to choose photographs of themselves, or to simply add pictorial icons. To do this, click the empty square alongside your name at the top of the dialog box. You’ll be shown a file list of default icons, or you can navigate to your own. Ideally, the image you choose should be square and 96×96 pixels, although if the picture is too large, it will be automatically scaled down. Click OK when you’ve finished. Adding and Removing Desktop Items Virtually the entire Ubuntu desktop can be redesigned and restructured. You can move the Applications menu from the top of the screen to the bottom to be more like Windows, for example, or you can add numerous desktop shortcuts to popular applications and/or files. Adding a Shortcut Ubuntu’s nearest equivalent to a Windows-style desktop shortcut is a launcher, and you can create a launcher that points to a program or a file. If a launcher is created for a file,
- 283. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 247 Ubuntu will automatically launch the correct program to display the file. If you create a launcher to a .jpg file, for example, Ubuntu will know to launch the Eye of GNOME image viewer when the launcher is double-clicked. Creating a Launcher You can create a launcher two ways. One way is to simply click and drag an icon from one of the main menus to the desktop. This effectively copies the menu’s launcher to the desktop, rather than creating a new launcher, but the effect is the same. The other way to create a launcher is to right-click the desktop and select Create Launcher. In the Create Launcher dialog box, select whether you want to create a launcher to a file or application from the Type drop-down list (the third option, Application in Terminal, will open a terminal window and run the program within it; this is only for specialized use). Then fill in the Name and Command fields. Alternatively, if you don’t know the exact name and path of the file, click the Browse button, use the file browser dialog box to navigate to the file or program, and click to select it. (If you are creating a launcher to a program, you’ll probably find it in /usr/bin, which stores most of the Linux programs you use from day to day.) The Comment field can be left blank. If it’s filled in, it forms the tooltip text that will appear if you hover the mouse cursor over the launcher icon. To choose an icon for your launcher, click the icon button on the left side of the Create Launcher dialog box. You can select from several predefined icons, as shown in Figure 10-14, or choose your own picture by clicking the Browse button. If you don’t choose an icon, a stock GNOME icon is used. Figure 10-14. Creating a launcher is easy. Just fill in the Name and Command fields, and choose an icon.
- 284. 248 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Creating a Link Launchers have one failing, and that is that they’re only recognized by GNOME (and other desktop environments, such as KDE). You can’t create a launcher to an application and use it from the command line, for example. In technical terms, a launcher isn’t recognized by the underlying Linux file system. The solution is to create a link to the file or program. This will actually create a symbolic link to the file. We explain more about file links in Chapter 14, but it’s enough to know that a link is very similar to a launcher, except it works on a file-system level. ■Note Actually, Linux offers two types of link: a symbolic link, which is the most common type of link used under Linux, and a hard link, which is a cross between copying a file and creating a shortcut. To create a link, locate the file you want to create the link to, right-click it, and select Make Link. The link will be created in the same directory as the original file, and you can then click and drag the new link to wherever you want it to appear, such as the desktop. You don’t need to choose an icon, because the link inherits the icon of the original file. For example, if it’s a picture link, it will inherit the thumbnail preview icon. ■Note If you find the Make Link option grayed out, it’s likely that you don’t have sufficient permissions to write the link to the directory in question. Personalizing the Panels Panels are the long strips that appear at the top and bottom of the Ubuntu screen and play host to a choice of menus, applets, and icons. You can add a new panel by right-clicking a blank spot on an existing panel and selecting New Panel. The new panel will appear on one of the sides of the desktop. If you add a third one, in addition to the two default panels, it will appear on the right side of the desktop vertically. You can also remove a panel by right- clicking it and selecting Delete This Panel. ■Caution If you delete a panel, the arrangement of items it contains will be lost. Of course, you can always re-create the collection on a different panel.
- 285. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 249 By right-clicking a panel and selecting Properties, you can change its size and dimen- sions. For example, by unchecking the Expand box, you can make the panel shrink to its smallest possible size. Then, when you add new components (or, in the case of a panel containing the Window List, a new program is run), the panel will expand as necessary. This can be a neat effect and also creates more desktop space. (This effect is a little like the Mac OS X Dock and might help migrating OS X users feel at home!) Selecting the Autohide feature will make the panel slide off the screen when there isn’t a mouse over it. Choosing Show Hide Buttons will make small arrows appear on either side of the panel so that you can click to slide it off the side of the screen when it’s not in use. Both these two techniques create more desktop space. You can also change the panel’s alignment to top, bottom, left, or right by changing the selection in the Orientation drop-down list. Adding and Removing Menus You can add either just the Applications menu or the entire set of menus (Applications, Places, and System) to the panel at the bottom of the screen. This can help those who long for the Windows Start button approach to access programs. Adding All the Menus to a Panel To add the Application, Places, and System menus to the panel at the bottom of the Ubuntu desktop, follow these steps: 1. Right-click a blank spot on the bottom panel and select Add to Panel. 2. In the dialog box that appears, click the Menu Bar option to add all three menus. You’ll find this under the Utilities heading in the list; you’ll need to scroll down to see it. 3. Click the Add button at the bottom of the dialog box. 4. Click the Close button. Adding a Start-Like Button to a Panel As an alternative to the Applications, Places, and System menu, you can add a Start-like button that offers submenus for all three menus. See Figure 10-15 for an example. Here’s how to add this button:
- 286. 250 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Figure 10-15. If you just can’t do without that Start button, you can re-create one on your Ubuntu desktop. 1. Right-click a blank spot on the bottom panel and select Add to Panel. 2. In the dialog box that appears, click the Main Menu option. You’ll find this under the Utilities heading in the list; you’ll need to scroll down to see it. 3. Click the Add button at the bottom of the dialog box. 4. Click the Close button. Deleting a Menu Creating new instances of the menus won’t delete the old ones. If you create a new Appli- cations menu at the bottom of the screen, for example, the old Applications menu will remain at the top of the screen. In fact, you can have as many instances of the menus on the desktop as you wish, although this won’t be a good use of desktop space! To delete any menu, simply right-click anywhere on that menu and select Remove from Panel. ■Tip You can personalize the Applications and System menus by right-clicking either and selecting Edit Menus. This will start the Main Menu program (also accessible from the System ➤ Preferences menu). Simply check or uncheck existing entries to add or remove them from the menus, or click the New Item button to create new entries.
- 287. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 251 Moving Panel Items To move a panel item, right-click it and select Move. Then drag the mouse to the new location, and click the mouse button once to set it in place. All panel items can be moved, including menus, and items can be moved between different panels. Any item that’s in the way will be shifted to make space. If the Move option is grayed out, right-click it and ensure that Lock to Panel doesn’t have a check alongside it. This is especially relevant if you’re trying to move an item into the space occupied by something else—if the other item is locked, it won’t automatically shift out of the way! GIVE ME MY TRASH CAN! The developers who designed Ubuntu’s desktop decided to keep the desktop largely clean of icons. This included relegating the Trash icon to its own applet at the bottom-right side of the screen. Many people find using the applet a little difficult and miss the desktop trash can icon, which has been present on Windows and Mac OS desktops for more than 20 years. The good news is that it’s easy to get the trash can back. Click Applications ➤ Accessories ➤ Terminal, and at the command prompt type gconf-editor. In the program window that appears, click the down arrows next to Apps, then Nautilus (you’ll need to scroll down the list a little), and then click Desktop. On the right side of the program window, put a check in the trash_icon_visible entry. The Trash icon should then instantly appear on your desktop! To delete the old Trash icon at the bottom right, simply right-click it and select Remove from Panel. You can also put a check in the computer_icon_visible, home_icon_visible, and documents_icon_visible entries if you wish to see Computer, Home, and Documents desktop icons. By putting a check alongside network_icon_visible, you can add a My Network Places–style icon to the desktop, too. Be careful when using the Configuration Editor program. It lets you configure just about every aspect of the GNOME desktop and doesn’t warn you when you’re about to do something devastating, so the potential for accidental damage is high! Working with Applets Almost everything you see on the desktop is actually considered by the GNOME desktop to be an applet, with the exception of application/file icons and the panels. A menu is a form of applet, for example, as is the Workspace Switcher.
- 288. 252 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT ■Note Applets are completely separate from screenlets, which were discussed earlier in this chapter. Applets are built into the GNOME desktop to provide essential functionality. Screenlets are provided by the Screenlets subsystem and “float” on top of the desktop. However, there are often overlaps in terms of the functions offered by applets and screenlets. Ubuntu provides many more applets that you can choose to add to the desktop to provide a host of useful or entertaining functionality. To add an applet, right-click a blank spot on a panel and select Add to Panel. As shown in Figure 10-16, you have a wide choice of applets. Some require configuration when they’re added, so you may need to right-click them and select Properties. For example, you’ll need to set your location in the Weather Report applet’s properties so it can provide accurate forecasting. For more details about each applet, and whether it needs additional configuration, see Table 10-1. To remove an applet, simply right-click it and select Remove from Panel. Figure 10-16. A wide variety of applets are available. Some are informative; others are just fun.
- 289. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 253 Table 10-1. Ubuntu Desktop Applets Applet Description Configurationa Address Book Search Lets you quickly retrieve contact None needed. information from your Evolution address book. Battery Charge Monitor Shows the battery level on None needed. notebooks and whether outlet power is in use. Brightness Allows you to adjust the brightness None needed. of a laptop screen. Character Palette Displays a palette of accented or None needed. unusual characters; click a character to insert it into the text. Clipboard Text Allows you to decrypt, encrypt, or Click to encrypt, sign, decrypt, or verify Encryption sign contents of the clipboard, clipboard contents. provided encryption is set up (see Chapter 9). Clock Displays the time and date (active None needed. by default). Connect to Server Lets you quickly connect to None needed. remote servers, such as FTP (equivalent of clicking Places ➤ Connect to Server). CPU Frequency Shows CPU frequency and, on Right-click to change frequency. Scaling Monitor compatible hardware and if correctly configured (see Chapter 8), lets you change CPU frequency. Deskbar Adds a quick search text box that None needed. allows you to search the Ubuntu software library or the Web. Dictionary Look up Displays a text box that will look None needed. up words according to online dictionaries. Disk Mounter Lets you quickly mount and None needed. unmount removable disks. Drawer Displays a drawer icon that, when Right-click and click Add to Drawer to clicked, “slides out” to reveal yet add applets. more applets. Dwell Click Displays a selection of mouse Click the preferred mouse action. actions to choose from for the dwell click feature (see the “Accessibility Settings” section earlier in this chapter).
- 290. 254 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Table 10-1. Ubuntu Desktop Applets (Continued) Applet Description Configurationa Eyes Displays two eyes whose pupils None needed. follow the mouse cursor. Fish Adds a couple of fish to the panel None needed. that, when clicked, will spout wisdom. Force Quit Lets you quit a crashed program. None needed. Invest Adds a text-based scrolling stock Right-click and select Preferences to ticker to the panel. add individual stock symbols to the list. Inhibit Applet Allows you to temporarily switch Click to forbid/allow automatic off automatic power saving, such as power saving. hard disk spin-down. Keyboard Accessibility Shows whether sticky keys or other None needed. Status accessibility functions are activated. Keyboard Indicator Shows the current language settings None needed. of the keyboard. Lock Screen Adds an icon that, when clicked, None needed. blanks the screen and displays a password prompt. Main Menu Lets you add a single icon None needed. Start-like system menu. Menu Bar Adds a new Applications, None needed. Places, and Desktop menu bar to the panel. Modem Monitor Displays virtual LEDs showing None needed. when modem data is sent/received and lets you quickly dial up with a single click. Network Monitor Displays virtual LEDs showing None needed. data sent/received via networking devices. Notification Area Adds a notification area to the None needed. panel (active by default). Pilot Applet Lets you quickly connect to Palm If Gnome-Pilot hasn’t already been devices via Gnome-Pilot software. set up, a configuration dialog box will appear. Pointer Capture Lets you temporarily switch off the Point the mouse cursor to the Pointer mouse pointer, to prevent mouse Capture icon (a green bar) and click to movement from getting in the way lock the mouse pointer. Click again to of typing. release the mouse pointer. Quit Lets you log out or shut down. None needed.
- 291. CHAPTER 10 ■ PERS ON ALIZING UBU NTU: GETTING EV ERYTHING JUS T RIGHT 255 Table 10-1. Ubuntu Desktop Applets (Continued) Applet Description Configurationa Run Application Adds an icon that, when clicked, None needed. makes the Run Application dialog box appear. Search for Files Provides one-click access to None needed. Nautilus’s search mode. Separator Simply inserts a graphical None needed. separator—useful for making several applets alongside each other look neater. Show Desktop Minimizes all desktop windows None needed. (active by default). Sticky Notes Lets you create virtual sticky notes. None needed. System Monitor Adds a small graph that shows Right-click and select Preferences to system resource usage. choose system areas to be monitored. Terminal Server Provides one-click access to None needed. Client Applet locations set up within the Terminal Server program (see Chapter 33). Tomboy Notes Lets you add sticky notes to None needed. the desktop. Trash Adds the Trash icon to the panel, None needed. where files can be dropped for removal to Trash. User Switcher Adds an icon that, when clicked, None needed. allows you to switch to another user. Volume Control Adds volume controls (active None needed. by default). Weather Report Adds an icon that shows current Right-click, and select Preferences weather conditions. and then the Location tab to set your location. Window List Adds a list of windows, which None needed. you can use to switch between currently running programs (active by default). Window Selector Adds an icon that, when None needed. clicked, switches between currently open windows (alternative to Window List). Workspace Switcher Shows virtual desktop selector. None needed. a Nearly all applets have configuration options that can be used to tweak them in various ways. This column indicates only if immediate configuration is needed.
- 292. 256 CHAPTER 10 ■ PERS ON ALIZING UBUN TU: GETTING EV ERYTHING JUS T RIGHT Summary In this chapter, you’ve learned how to completely personalize Ubuntu to your own tastes. We’ve looked at changing the theme so that the desktop has a new appearance, and we’ve examined how to make the input devices behave exactly as you would like. In addition, you’ve learned how to add and remove applets from the desktop in order to add functionality or simply make Ubuntu work the way you would like. In the next chapter, we will look at what programs are available under Ubuntu to replace those Windows favorites you might miss.
- 293. CHAPTER 11 ■■■ Ubuntu Replacements for Windows Programs U buntu is a thoroughly modern operating system and, as such, includes a comprehen- sive selection of software for just about every day-to-day task. Regardless of whether you want to write letters, edit images, or listen to music, Ubuntu offers something for you. This chapter introduces the software under Ubuntu that performs the tasks you might be used to under Windows. It’s not a detailed guide to each piece of software. Instead, this chapter aims to get you up and running with the Ubuntu replacement as quickly as possible. The chapter will tell you the name of the software, where you can find it on Ubuntu’s menus, and a few basic facts about how to use it. In many cases, these applications are covered in far more depth later in the book. Available Software Table 11-1 lists various popular Windows programs alongside their Ubuntu counterparts. You’ll find most of the programs listed on the Applications menu. Table 11-1 also includes a number of other mainstream alternatives, most of which aren’t installed by default under Ubuntu, but are available from the Ubuntu online software repositories. You might want to try these later on. As you might expect, they’re all free of charge, so you have nothing to lose. ■Note Table 11-1 lists only a fraction of the programs available under Linux. There are quite literally thou- sands of others. The programs listed here are those that work like their Windows equivalents and therefore provide an easy transition. 257
- 294. 258 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS Table 11-1. Ubuntu Alternatives to Windows Software Type of Program Windows Ubuntu Alternative Choices Word processor Microsoft Word OpenOffice.org AbiWord (www.abisource.com), Writer KOffice KWord (www.koffice.org/ kword) Spreadsheet Microsoft Excel OpenOffice.org Gnumeric (www.gnome.org/ Calc projects/gnumeric), KOffice KSpread (www.koffice.org/ kspread) Presentations Microsoft PowerPoint OpenOffice.org KOffice KPresenter Impress (www.koffice.org/kpresenter) Drawing Adobe Illustrator OpenOffice.org Inkscape (www.inkscape.org), (vector art) Draw KOffice Karbon 14 (www.koffice.org/karbon) Database Microsoft Access OpenOffice.org Knoda (www.knoda.org) Base1 Web page creation Microsoft FrontPage OpenOffice.org SeaMonkey (www.mozilla.org/ Writer projects/seamonkey), Amaya (www.w3.org/Amaya) E-mail Microsoft Outlook Evolution Mozilla Thunderbird (www.mozilla.com), KMail (http:// kontact.kde.org/kmail) Contacts manager/ Microsoft Outlook Evolution Kontact (www.kontact.kde.org) calendar Web browser Microsoft Internet Mozilla Firefox Konqueror (www.konqueror.org), Explorer Opera (www.opera.com)2 CD/DVD burning Nero Nautilus3 K3b (www.k3b.org), Brasero (www.gnome.org/projects/ brasero) MP3 player Winamp Rhythmbox Aqualung (http:// aqualung.factorial.hu), Banshee (http://banshee-project.org) CD player/ripper Windows Media Player Sound Juicer Grip (http://nostatic.org/grip) Movie/DVD player Windows Media Player Totem Media VLC (www.videolan.org) MPlayer Player (www.mplayerhq.hu/homepage) Image editor Adobe Photoshop The GIMP KOffice Krita (www.koffice.org/ krita) Zip files WinZip Archive Manager KArchiver (http://pagesperso- orange.fr/coquelle/karchiver) MS-DOS prompt cmd.exe/command.exe GNOME Xterm (www.x.org)4 Terminal Calculator Calc Calculator Too many to mention!
- 295. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 259 Table 11-1. Ubuntu Alternatives to Windows Software (Continued) Type of Program Windows Ubuntu Alternative Choices Text editor/viewer Notepad Gedit Kate (www.kate-editor.org) Desktop games Minesweeper/Solitaire Mines/AisleRiot Too many to mention! Solitaire 1 Base isn’t installed by default, but it is easily installed via the openoffice.org-base package. This database tool is tightly integrated with the rest of the OpenOffice.org suite. 2 Opera is a proprietary product, rather than open source; however, it is free of charge. 3 Nautilus is the file manager within Ubuntu; to activate its CD/DVD burning mode, click Go ➤ CD/DVD Creator. 4 Xterm is part of the X.org package, so it is installed by default under Ubuntu. To use it, type xterm in a GNOME Terminal window. See Chapter 10 to learn how to create a permanent desktop launcher for Xterm. LINUX HAS IT ALL The Ubuntu software archives contain thousands of programs to cover just about every task you might wish to do on your computer. Diversity is vitally important within the Linux world. For example, rather than offering just one e-mail program, you’ll find many available. They compete with each other in a gentle way, and it’s up to you which one you settle down with and use. Part of the fun of using Linux is exploring what’s available. Of course, the added bonus is that virtu- ally all this software is free of charge, so you can simply download, install, and play around. If you don’t like a program, just remove it from your system. However, don’t forget to revisit the program’s home page after a few months; chances are the program will have been expanded and improved in that short period, and it might be better at meeting your needs. A Quick Start with Common Linux Programs The remainder of this chapter outlines a handful of the programs listed in Table 11-1. Our goal is to give you a head start in using each program, pointing out where most of the main functions can be found. You’ll find more details about the The GIMP image editor, multi- media tools, and office applications in Parts 5 and 6 of this book. Keep in mind that Linux doesn’t aim to be an exact clone of other operating systems. Some of the programs will work in a similar way to what you’re used to, but that’s not true of all of them. Because of this, it’s very easy to get frustrated early on when programs don’t seem to work quite how you want or respond in strange ways. Some programs might hide functions in what seem like illogical places compared with their counterparts on other operating systems. Some patience is required, but it will eventually pay off as you get used to Linux.
- 296. 260 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS Word Processing: OpenOffice.org Writer OpenOffice.org is an entire office suite for Linux that was built from the ground up to compete with Microsoft Office. Because of this, you’ll find much of the functionality of Microsoft Office is replicated in OpenOffice.org, and the look and feel are also similar. The major difference is that OpenOffice.org is open source and therefore free of charge. OpenOffice.org Writer (Applications ➤ Office ➤ OpenOffice.org Word Processor), shown in Figure 11-1, is the word processor component. As with Microsoft Word, it’s fully WYSIWYG (What You See Is What You Get), so you can quickly format text and paragraphs. This means the program can be used for elementary desktop publishing, and pictures can be easily inserted (using the Insert menu). Figure 11-1. OpenOffice.org Writer Writer’s toolbars provide quick access to the formatting tools, as well as to other common functions. The vast majority of menu options match those found in Word. Right-clicking the text itself also offers quick access to text-formatting tools. A number of higher-level functions are provided, such as mail merge and spell-checking, (found on the Tools menu). You can perform spell-checking on the fly, with incorrect words underlined in red as you type.
- 297. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 261 As with all OpenOffice.org packages, Writer is fully compatible with Microsoft Office files, so you can save and open .doc files. Just click File ➤ Save As, and click the arrow alongside File Type to choose a document format. The only exception is password- protected Word files, which cannot be opened. You can also export documents as PDF files (using File ➤ Export As PDF), so they can be read on any computer that has Adobe Acrobat Reader installed. ■Note Although compatible with Microsoft Office 2003 (and below) file formats, OpenOffice.org isn’t compatible with Office 2007’s Open XML file format at the time of writing. However, this will almost certainly change, which is another reason to regularly update your Ubuntu system. OpenOffice.org Writer is covered in more detail in Chapter 23. Spreadsheet: OpenOffice.org Calc As with most of the packages that form the OpenOffice.org suite, Calc (Applications ➤ Office ➤ OpenOffice.org Spreadsheet) does a good impersonation of its proprietary coun- terpart, Microsoft Excel, both in terms of powerful features and the look and feel, as you can see in Figure 11-2. However, it has only limited support for Excel’s Visual Basic for Applications (VBA) macros at present. Instead, Calc and other OpenOffice.org programs use their own macro language, called OpenOffice.org Basic (for more information, see http://development.openoffice.org). Calc has a vast number of mathematical functions. To see a list, choose Insert ➤ Function. The list on the left side of the dialog box includes a brief explanation of each function to help you get started. Just as with Excel, you can access the functions via the toolbar (by clicking the Function Wizard button), or you can enter them directly into cells by typing an equal sign and then the formula code. Calc is intelligent enough to realize when formula cells have been moved and to recalculate accordingly. It will even attempt to calculate formulas automatically and can work out what you mean if you type something like sales + expenses as a formula. As you would expect, Calc also provides automated charting and graphing tools (under Insert ➤ Chart). In Figure 11-2, you can see an example of a simple chart created automat- ically by the charting tool. You can format cells using the main toolbar buttons, or automatically apply user-defined styles (choose Format ➤ Styles and Formatting).
- 298. 262 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS ■Tip In all the OpenOffice.org applications, you can hover the mouse cursor over each button for one second to see a tooltip showing what it does. Figure 11-2. OpenOffice.org Calc If you’re a business user, you’ll be pleased to hear that you can import databases to perform serious number-crunching. Use Insert ➤ Link to External Data to get the data, and then employ the tools on the Data and Tools menu to manipulate it. As with all OpenOffice.org programs, compatibility with its Microsoft counterpart— Excel files in this case—is pretty good. You can also open other common data file formats, such as comma-separated values (CSV) and Lotus 1-2-3 files. OpenOffice.org Calc is covered in more detail in Chapter 24.
- 299. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 263 Presentations: OpenOffice.org Impress Anyone who has used PowerPoint will immediately feel at home with Impress, OpenOffice.org’s presentation package (Applications ➤ Office ➤ OpenOffice.org Presentation), shown in Figure 11-3. Impress duplicates most of the common features found in PowerPoint, with a helping of OpenOffice.org-specific extras. The program works via templates into which you enter your data. Starting the program causes the Presentation Wizard to appear. This wizard guides you through selecting a style of presentation fitting the job you have in mind. At this point, you can even select the type of transition effects you want between the various slides. Once the wizard has finished, you can choose from the usual normal and outline view modes (available from the View menu). Outline mode lets you enter your thoughts quickly, while normal mode lets you type straight onto presentation slides. You can format text by highlighting it and right-clicking it, by using the Text Formatting toolbar that appears whenever you click inside a text box, or by selecting an entry on the Format menu. Impress also features a healthy selection of drawing tools, so you can create quite complex diagrams. These are available on the Drawing toolbar along the bottom of the screen. You can also easily insert pictures, other graphics, and sound effects. Figure 11-3. OpenOffice.org Impress
- 300. 264 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS You can open and edit existing PowerPoint (PPT) files and, as with all OpenOffice.org packages, save your presentation as a PDF file. Impress also lets you export your presentation as a Macromedia Flash file (SWF). This means that anyone with a browser and Macromedia’s Flash plug-in can view the file, either online or via e-mail. Simply click File ➤ Export, and then choose Macromedia Flash from the File Format drop-down list. Along with slide presentations, Impress also lets you produce handouts to support your work. OpenOffice.org Impress is covered in more detail in Chapter 25. Database: OpenOffice.org Base Base, shown in Figure 11-4, allows you to create relational databases using a built-in data- base engine, as well as interface with external databases. Base is not installed by default, so you will need to install the openoffice.org-base package using System ➤ Administra- tion ➤ Synaptic Package Manager. Then you can access it by clicking Applications ➤ Office ➤ OpenOffice.org Database. Base is very similar to Microsoft Access in look and feel, although it lacks some of Access’s high-end functions. For most database uses, it should prove perfectly adequate. If you know the fundamentals of database technology, you shouldn’t have any trouble getting started with Base immediately. This is made even easier than you might expect, because when the program starts, a wizard guides you through the creation of a simple database. As with Access, Base is designed on the principles of tables of data, forms by which the data is input or accessed, and queries and reports by which the data can be examined and outputted. Once again, wizards are available to walk you through the creation of each of these, or you can dive straight in and edit each by hand, by selecting the relevant option. Each field in the table can be of various types, including several different integer and text types, as well as binary and Boolean values. Forms can contain a variety of controls, ranging from simple text boxes to radio buttons and scrolling lists, all of which can make data entry easier. Reports can feature a variety of text formatting and can also rely on queries to manipulate the data. The queries themselves can feature a variety of functions and filters in order to sort data down to the finest detail. You’ll learn more about Base in Chapter 26.
- 301. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 265 Figure 11-4. OpenOffice.org Base E-Mail/Personal Information Manager: Evolution Evolution is a little like Microsoft Outlook in that, in addition to being an e-mail client, it can also keep track of your appointments and contacts. You can start Evolution by clicking Applications ➤ Office ➤ Evolution Mail and Calendar. Before using the program, you’ll need to set it up with your mail server settings, as detailed in Chapter 8. Evolution is compatible with POP/SMTP, IMAP, Novell GroupWise, Hula, Microsoft Exchange, and a handful of Unix mail formats rarely used nowadays. Once the program is up and running, as shown in Figure 11-5, you can create a new message by clicking the New button on the toolbar. To reply to any e-mail, simply select it in the list, and then click the Reply or Reply To All button, depending on whether you want to reply to the sender or to all the recipients of the message.
- 302. 266 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS To switch to Contacts view, click the relevant button on the bottom left. If you reply to anyone via e-mail, they’re automatically added to this Contacts list. You can also add entries manually by either right-clicking someone’s address in an open e-mail or right- clicking in a blank space in the Contacts view. Clicking the Calendar view shows a day-and-month diary. To add an appointment, simply select the day, and then double-click the time you want the appointment to start. You can opt to set an alarm when creating the appointment, so that you’re reminded of it when it’s scheduled. Finally, by clicking the Tasks and Memos buttons, you can create a to-do list and jot down quick notes, respectively. To add a task, click the bar at the top of the list. Once an entry has been created, you can put a check in its box to mark it as completed. Completed tasks are marked with strike-through, so you can see at a glance what you still need to do. To add a memo, click the bar at the top of the memo list, and simply type what you want to remember. In addition to the setup guide in Chapter 8, you’ll find a full explanation of Evolution’s features in Chapter 27. Figure 11-5. Evolution Web Browser: Firefox You might already know of Mozilla Firefox under Windows, where it has firmly established itself as the alternative browser of choice. The good news is that the Linux version of Firefox is nearly identical to its Windows counterpart. Start it by selecting Applications ➤ Internet ➤ Firefox Web Browser.
- 303. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 267 When the program starts, as shown in Figure 11-6, you can type an address into the URL bar to visit a web site. If you wish to add a site to your bookmarks list, click Bookmarks ➤ Bookmark This Page. Alternatively, you can press Ctrl+D. Searching is very easy within Firefox, using its search bar at the top right of the window. By default, Firefox uses Google for searches. To choose from other search engines, click the small down arrow on the left side of the search box. You can even enter your own choice of site if your favorite isn’t already in the list—click Manage Search Engines, and then click the Get More Search Engines link in the dialog box that appears. Firefox popularized the principle of tabbed browsing, which means you can have more than one site open at once. To open a new tab, press Ctrl+T. You can move between the tabs by clicking them. Figure 11-6. Mozilla Firefox ■Tip When Firefox starts, tabs aren’t activated. If you would like to keep tabs in view all the time, click Edit ➤ Preferences, and then click the Tabs button. Then put a check alongside Always Show the Tab Bar. Firefox is compatible with most of the same add-ons (extensions) you might have used under the Windows version of the browser. You can download new add-ons from https:// addons.mozilla.org. In addition, Firefox under Ubuntu can work with Flash animations,
- 304. 268 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS although you’ll need to download the Flash Player software first. See the instructions in Chapter 19 to learn more. Audio Playback: Rhythmbox and Sound Juicer Ubuntu’s multimedia software is basic but effective. It can play back the majority of audio files, as long as it’s properly configured, which is to say after additional software has been installed. We’ll describe how to set up this software in Chapter 18, and if you’re thinking of playing audio files on your computer, you may want to read that chapter immediately. Rhythmbox is the audio file player, which can be started by clicking Applications ➤ Sound & Video ➤ Rhythmbox Music Player. Sound Juicer is primarily designed to rip CD tracks to disk, but it also serves as Ubuntu’s CD player (simply click the Play button in the program window to listen to tracks). Figure 11-7 shows both of these applications. Figure 11-7. Rhythmbox and Sound Juicer When you run Rhythmbox for the first time, it will attempt to find and then catalog your music collection. You might be used to this kind of functionality with Windows applications like iTunes. After the initial file search has taken place, whenever Rhythmbox runs, you will find your tracks listed by artist or name, providing they have the relevant tag information embedded in them (such as ID3 tags in MP3 music).
- 305. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 269 ■Note Unlike iTunes, Rhythmbox can’t play Digital Rights Management (DRM)-protected files. To start playing a music track, double-click it in the list. To make the player smaller so that it doesn’t dominate the screen, click View ➤ Small Display. Sound Juicer is very simple to operate. It will open automatically once a CD has been inserted. To start playing the CD, select a track from the list and click the Play button, just click Play to play the CD starting from track 1. While Sound Juicer is playing, you can switch to any other tracks by double-clicking them in the list. One nice feature of Sound Juicer is that it will automatically look up the artist and track information about most CDs online, and then save the information for future reference. You can control the volume within Rhythmbox or Sound Juicer, or use the volume control applet, which is located at the top-right side of the Ubuntu desktop, near the clock. Simply click and then drag the slider to adjust the volume. Movie Playback: Totem Movie Player Totem Movie Player, which can be started by clicking Applications ➤ Sound & Video ➤ Movie Player, is able to handle the majority of video files you might own, as long as some additional software is installed. Totem can also play back DVD movies, which, again, requires the installation of software. We’ll cover setting up this software in Chapters 18 and 19; if you intend to play back videos and DVDs, these chapters should be your first port of call. Like Rhythmbox and Sound Juicer, Totem is an uncomplicated application. As shown in Figure 11-8, the video will play on the left side of the window. A playlist detailing movies you have queued appears on the right side. You can remove this, to give the video more room, by clicking the Sidebar button. You can control video playback using the play/pause, fast forward, and rewind buttons at the bottom left. In addition, provided a compatible video format is being played, you can use the Time bar to move backward and forward within the video file. You can switch to full-screen playback by clicking View ➤ Fullscreen. To switch back, simply press the Esc key. If you’re watching a program that has been ripped from TV, you might want to use the Deinterlace feature on the View menu to remove any interference patterns. Provided the software described in Chapter 19 is installed, DVD playback will start automatically as soon as a disc is inserted, and you should be able to use the mouse with any on-screen menus. In addition, you can skip between chapters on the disc using the Go menu, and also return to the DVD’s main or submenu systems. To switch between the various languages on a DVD (if applicable), click Sound ➤ Languages and choose from the list.
- 306. 270 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS Figure 11-8. Totem Movie Player CD/DVD Burning: Nautilus and Brasero As soon as you insert a blank writable disc, whether it’s a CD or DVD, Ubuntu will detect it and offer you two choices. You can then create a data or audio disc. If you choose to create an audio CD, the Brasero application will open. If you choose to create a data or photo CD/DVD, a Nautilus file browser window will open in CD/DVD Creator mode. Both programs are shown in Figure 11-9. To use Brasero to create an audio CD, drag-and-drop your music files onto the program window, and then click the Burn button. Keep an eye on the meter at the bottom right. This is like a progress bar; when the green portion is full, the disc is full. Note that you won’t be able to write certain audio files, like MP3s, to CDs unless you have the relevant codecs installed. See Chapter 18 to learn more. Using the Nautilus CD/DVD Creator is similar to using Brasero. Just drag-and-drop files onto the window to create shortcuts to the files. When it comes time to burn, Nautilus will copy the files from their original locations. When you’ve finished choosing files, click the Write to Disc button. Unfortunately, you won’t see a warning if the disc’s capacity has been exceeded until you try to write to the disc. However, by right-clicking an empty space in the Nautilus window and selecting Properties, you can discover the total size of the files. Remember that most CDs hold 700MB, and most DVD+/-R discs hold around 4.7GB (some dual-layer discs hold twice this amount; see the DVD disc packaging for details).
- 307. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 271 ■Tip Most modern CD/DVD recorders utilize burn-proof technology, which helps ensure error-free disc creation. To activate this, open a terminal window (Applications ➤ Accessories ➤ Terminal), and type gconf-editor. When the program starts, click Edit ➤ Find, and then type burnproof. Make sure there’s a check in Search Also in Key Names. In the search results at the bottom of the window, click the first result (/apps/nautilus-cd-burner/burnproof) and make sure there’s a check in burnproof at the top right of the window. Then close the configuration editor. Figure 11-9. Nautilus CD/DVD Creator and Brasero Photo Editing: The GIMP While many of the other programs introduced so far mirror the Windows look and feel in some way, The GIMP walks a different path. It has its own unique way of working, which takes a little getting used to. But it’s very much worth the effort, because The GIMP offers photo-editing tools on par with professional products like Adobe Photoshop. It’s certainly more than powerful enough for tweaking digital camera snapshots. To start The GIMP, select Applications ➤ Graphics ➤ GNU Image Manipulation Program. Once the program is running, you’ll notice that it’s actually little more than a large toolbar on the left side of the screen. Everything else that runs within The GIMP—whether it’s a
- 308. 272 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS window containing the image you’re editing or an additional configuration dialog box— uses its own program window. This also means that each program item that you activate gets its own button on the panel at the bottom of the screen. To open a picture, select File ➤ Open and select your image from the hard disk. Once an image file is opened, you can manipulate it using the tools on the toolbar (which are similar to those found in other image editors). On the bottom half of the main program window, you’ll find the settings for each tool, which can be altered, usually via click-and- drag sliders. To apply filters or other corrective changes, right-click anywhere on the image to bring up a context menu with a variety of options. For example, simple tools to improve bright- ness and contrast can be found on the Colors submenu, as shown in Figure 11-10. For an in-depth look at The GIMP package, see Chapter 20. Figure 11-10. The GIMP
- 309. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 273 Other Handy Applications Many additional applications might prove useful on a day-to-day basis. Here, we’ll review some of the more common ones. Calculator The GNOME Calculator (also known as Gcalctool) can be found on the Applications ➤ Accessories menu. In its default mode, shown in Figure 11-11, it shouldn’t present any challenges to anyone who has ever used a real-life calculator, although the Bksp key might be new. This simply deletes the last number you typed (handy if you miskey during a calculation). Figure 11-11. GNOME Calculator Calculator also has three other modes that you can switch into using the View menu: Advanced, Financial, and Scientific. All offer calculator functions relevant to their settings. The Advanced mode is simply a more complicated version of the basic Calculator. It can store numbers in several memory locations, for example, and can also carry out less common calculations, such as square roots and reciprocals. Archive Manager Archive Manager (also known as File Roller), shown in Figure 11-12, is Ubuntu’s archive tool. It’s the default program that opens whenever you double-click .zip files (or .tar, .gz, or .bzip2 files, which are the native archive file formats under Linux). To extract files from an archive, select them (hold down the Ctrl key to select more than one file), and then click the Extract button on the toolbar.
- 310. 274 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS To create an archive on the fly, select files or folders in a Nautilus file browser window, right-click the selection, and select Create Archive. Give the archive a name, and the archive will be created. To add new files to an existing archive, double-click an archive file, and then drag-and-drop files into the Archive Manager window. When you’ve finished, simply close the Archive Manager window. Figure 11-12. Archive Manager Dictionary You can use the Dictionary tool to look up the definitions of words using the Collaborative International Dictionary of English. This dictionary is based on a 1913 edition of Webster’s Revised Unabridged Dictionary, but with some additional modern definitions. The Dictio- nary tool is useful for quick lookups, although if you want a precise and modern definition of a word, you might consider using a more contemporary source.
- 311. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 275 You’ll find the Dictionary program on the Applications ➤ Accessories menu. Type the word in the Look Up text box at the top of the window, and its definition will appear in the area below, as shown in Figure 11-13. As soon as you start typing, the program will begin to look up the word in the dictionary, and this can cause a momentary delay before the letters appear on your screen. Figure 11-13. Dictionary Pidgin Internet Messenger Pidgin is the instant messaging software provided with Ubuntu. Unlike most other messaging programs, Pidgin isn’t exclusive to one chat protocol. You can use it to connect to MSN, AOL/ICQ, Yahoo!, and many other services. The program can be found on the Applica- tions ➤ Internet menu. Details for setting up Pidgin are in Chapter 8. Once the program is up and running, you can chat with any of your buddies by double-clicking their icon, as shown in Figure 11-14. The rest of the program can be administered by right-clicking the notification area icon that appears when the program starts. For example, you can change your status or sign off from there.
- 312. 276 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS Figure 11-14. Pidgin Mines Mines is the Ubuntu equivalent of Minesweeper, and is almost exactly the same as the Windows program, as you can see in Figure 11-15. The rules are identical, too: on each grid are several hidden mines, and it’s your job to locate them. After you’ve clicked one square at random, you’ll see a series of empty squares and several with numbers in them. Those with numbers indicate that a bomb is near. Your job is to deduce where the bombs are, and then mark them by right-clicking them. You have to do this as quickly as possible, because you’re being timed. To change the grid size, click Settings ➤ Preferences. Your choices are Small, Medium, Large, and Custom.
- 313. C HA PT ER 1 1 ■ UB UNTU REPLAC EMEN TS FO R WI ND OWS PROGR AMS 277 Figure 11-15. Mines Ekiga Ekiga provides Internet telephony (known as Voice over IP, or VoIP), via the SIP and H.323 protocols. It also provides video conferencing, and is compatible with all major features specified within SIP and H.323, such as holding, forwarding, and transferring calls. Ekiga can be found on the Applications ➤ Internet menu. To activate the camera mode for a video conference, click the webcam icon on the left side of the window. To text chat, click the top icon on the left side of the window. When the program starts, it will walk you through setup via a wizard. Simply answer the questions with your details. Once the program is up and running, as shown in Figure 11-16, type the URL of the person you would like to call into the address bar and click Call ➤ Call. Note that Ekiga is not compatible with proprietary VoIP software, such as Skype. To learn how to install Skype under Ubuntu, see Chapter 18.
- 314. 278 CH APT ER 11 ■ UBUN TU RE PLA CE MENT S F O R WIN DO WS PRO GRA MS Figure 11-16. Ekiga Summary In this chapter, we’ve taken a look at some Ubuntu programs that provide vital functions that you might have used daily under Windows. The aim was to get you started with this software as quickly as possible by pointing out key features. You’ve seen how some programs mirror the look and feel of their Windows counterparts almost to the letter, while others resolutely strike out on their own path. It takes just a little time to become familiar with Ubuntu software, and then using these programs will become second nature. In the next chapter, we’ll move on to more fundamental Ubuntu tasks: manipulating files. However, once again, this is not too dissimilar from the Windows experience, which makes getting used to the system very easy.
- 315. CHAPTER 12 ■■■ Managing Your Files F iles are what make the world of Linux go round. They’re the currency of any kind of operating system, because every time you use your computer, you generate new files, even if they’re only temporary. How Linux views files, as well as the disks and partitions that contain them, varies some- what from how Windows handles files. In many ways, the Linux system of file management is far simpler than that in Windows (which, ironically, was created as an attempt to make everything easy!). In this chapter, we will explain how you can manage your files under Ubuntu. This isn’t a definitive guide; you’ll need to wait until Chapter 14 to learn the technical ins and outs of the file system and the all-important system of user accounts that goes hand-in-hand with files. However, this chapter provides enough information for you to understand how the system works, and where and how you should store your data. Understanding File System Concepts Just like Windows, Ubuntu has a file system that is shared among software components and your own personal data, which you generate within various applications, or perhaps download from the Internet. However, Ubuntu differs from Windows in a couple of important ways. Drive References Perhaps the most important differences between Linux and Windows are the following: • The Linux file system doesn’t use drive letters. • The Linux file system uses a forward slash (/) instead of a backslash () in filename paths. 279
- 316. 280 CHAPTER 12 ■ MA NA GING YOUR FILES In other words, something like /home/john/myfile is typical under Ubuntu, as opposed to C:Documents and SettingsJohnmyfile under Windows. The root of the hard disk partition is usually referred to as C: under Windows. In Ubuntu, it’s referred to simply with a forward slash (/). If you have more than one drive, the drives are usually combined into one file system under Linux. This is done by mounting, so that the any additional drives appear as virtual folders under the file system. In other words, you browse the other hard disks by switching to various directories within the main file system. We’ll explain mounting in Chapter 14. ■Note If you’re used to Mac OS X, then the Ubuntu file system shouldn’t come as much of a surprise, because both OS X and Ubuntu are based on Unix and utilize similar concepts. Names of Files Another important difference between Ubuntu and Windows is that filenames in Ubuntu are case-sensitive. This means that MyFile is distinctly different from myfile. Uppercase letters are vitally important. In Windows, filenames might appear to have uppercase letters in them, but these actually are ignored when you rename or otherwise manipulate files. Because of this case-sensitivity, you could have two separate files existing in the same place, one called MyFile and another called myfile. In fact, you could also have myFile, Myfile, MYFILE, and so on, as shown in Figure 12-1. As with Windows, filenames can have spaces within them. This means it’s possible to have file or folder names like Pictures from Disneyland or party at bob's house.jpg. ■Note You might notice that some Linux old-hands avoid using spaces in filenames and use an underscore character (_) instead. There are two main reasons for this. The first is that it’s tricky to manipulate filenames with spaces in them at the command prompt (discussed in Part 4 of this book). Secondly, Internet services are often incompatible with filenames with spaces in them, which means that to use those services, you would need to rename files (unless you put them in an archive first). Unlike with Windows, filenames can include virtually any symbol, including an asterisk (*), backslash (), question mark (?), less-than/greater-than signs (< and >), and so on. The only symbol that’s prohibited is the forward slash (/), and that’s because it has a special use in file paths, as described in the previous section. Be aware, however, that if you wish to share files with colleagues running Windows, you should stick to Windows conventions to avoid incompatibilities, and refrain from using the following symbols: /:*?"<>|.
- 317. CHAPTER 12 ■ MA NA GIN G YOUR FILES 281 Figure 12-1. Ubuntu filenames are case-sensitive, so many similar filenames can exist, differing only in which letters are capitalized. ■Note If you try to copy a file with illegal symbols to a Windows machine across a network, Ubuntu simply won’t let you, and will report an Invalid Parameters error. File Access and Storage Windows Vista tightens up security and does not allow users to write files outside the Users directory unless they have permission, But under Windows XP, you have access to the entire hard disk. You can write, read, or delete files anywhere (unless the system has specifically been configured otherwise). You can save your personal files in C:Windows, for example. Under Ubuntu, ordinary users can browse most of the hard disk, but they aren’t able to write files to the majority of folders (in some cases, they won’t even be able to access files). Although we’ll cover the file system in much more depth in Chapter 14, for the moment, it’s enough to know that you’ve been given your own part of the hard disk in which to store your stuff. This is a directory located within the /home directory, and its name is taken from your username. If your login name is louisesmith, your place for storing files will be /home/ louisesmith. Figure 12-2 shows an example of a user’s home directory.
- 318. 282 CHAPTER 12 ■ MA NA GING YOUR FILES ■Note Linux generally uses the terms directory and subdirectory for the places you put files, whereas Windows refers to them as folders. It’s merely a matter of semantics. However, within the Nautilus file browser, directories are pictured as folders and are referred to as such. Figure 12-2. Your personal area on the hard disk is in the /home directory and is named after your username. Some programs might create subdirectories in your home directory in order to store and organize their output. For example, a digital camera program might create a Pictures directory within your /home directory. It’s up to you whether you use these. The standard practice within the Linux community is to simply save everything into your /home subdi- rectory (for example, /home/keir) and sort it out later! Files within Ubuntu remember who owns them. If user johnsmith creates a file, he can make it so that only he can read or write the file (the default setting is that other users will be able to read the file, but not write any new data to it). Directories, too, are owned by
- 319. CHAPTER 12 ■ MA NA GIN G YOUR FILES 283 people, and the owner can set access permissions. By default, all users on a system can access each other’s /home directories and read files, but they won’t be able to change the files or write new files to any directory within /home that isn’t theirs. ■Note Any user with superuser powers has access to all of the system and can create, edit, and delete files in all directories. This is so the user can perform essential system maintenance. Using Nautilus Nautilus is the name of the default file browser in Ubuntu. It’s similar to My Computer or Windows Explorer under Windows, in that it presents a list of files on the right side of the window and a series of shortcuts to popular locations within the file system on the left side. Starting Nautilus is simply a matter of clicking the Places menu and choosing a loca- tion, as shown in Figure 12-3. Figure 12-3. You can open a file browser window by selecting a location from the Places menu.
- 320. 284 CHAPTER 12 ■ MA NA GING YOUR FILES The Nautilus window (see Figures 12-1, 12-2, and 12-4) consists of several elements: Menu bar: The Nautilus menu bar has File, Edit, View, Bookmarks, and Help menus. The View menu offers options for controlling the way files are displayed in the Nautilus window, as well as the look and feel of Nautilus itself. The Edit menu lets you manu- ally cut, copy, and paste files. The Go menu lets you quickly jump to other locations in the file system. Using the Bookmarks menu options, you can create web browser– like shortcuts to certain locations in your file system, so you can access them instantly. There are also some ready-made bookmarks for folders in your /home directory: Documents, Music, Pictures, and Videos. Toolbar: As in a web browser, the toolbar allows you to quickly move backward and forward from place to place in your browsing history. In addition, you can reload the file listing, in order to reflect any changes that might have taken place since the Nautilus window opened, and quickly navigate to popular file system locations, such as your /home directory. Location bar: This feature, located beneath the toolbar, is unique to Nautilus and works in two modes. The first mode, which we’ll call button mode, is activated by default. This shows individual directories as buttons on the location bar and lets you see where you are in your file system at a glance, as well as quickly and easily move through your file-browsing history. For example, if you start in /home/keir (displayed as the keir button), and then browse to /home/keir/Pictures/holiday/disneyworld, clicking the Pictures button will return you to /home/keir/Pictures. The other folders listed on the location bar (holiday and disneyworld in this example) won’t disappear and will still have buttons, so you can return to those as well. It’s best demonstrated by example, so give it a try! The second mode, activated by clicking the icon to the left of the location bar buttons, switches the location bar into a more traditional, text-based bar, where you can type paths and filenames manually. To switch back to button mode, click the icon again. Zoom controls: To the right of the location bar are the zoom controls. These make the icons representing the files bigger or smaller. When you’re browsing a lot of files at once, shrinking them will fit more in the window. On the other hand, when you’re viewing photo thumbnails, it can be handy to increase the zoom setting, so you can see more detail in the pictures.
- 321. CHAPTER 12 ■ MA NA GIN G YOUR FILES 285 View As Icons/List: To the right of the zoom controls is a drop-down list that switches between icon and list view. List view shows details about the files, such as file size, the type of file, its permissions, and so on. Icon view presents the files as a series of large icons. In many cases, the icons will give a clue as to the nature of the file; for example, audio files appear with musical note graphics. If the folder you’re browsing contains image files (or certain document files, such as PDFs), these will be automatically thumbnailed—the icon will be a small version of the contents of the file, as shown in Figure 12-4. This is very handy when browsing pictures for printing or editing. Figure 12-4. Whenever you view a folder full of pictures in icon view, they will be automati- cally thumbnailed.
- 322. 286 CHAPTER 12 ■ MA NA GING YOUR FILES Places pane: The Places pane on the left lists the most popular locations within the file system, as well as any locations that you’ve bookmarked. Double-clicking each icon takes you to that location instantly. Clicking the File System entry takes you to the root of the file system (/). There are also bookmarks for your floppy drive (if you have one), your deleted files in the Trash folder, and any servers available on the local network. ■Tip To bookmark a location, drag a folder to the blank area beneath the currently bookmarked folders in the Places pane. As under Windows, you can right-click each file in the file browser window to see a context menu with options to rename the file, delete it, open it with particular applica- tions, and so on. The Properties option on the context menu lets you view information about the file and alter certain aspects of it, such as its access permissions (discussed in Chapter 14). You can even add some text notes about the file if you wish! ■Caution You should never delete your /home folder. Doing so will most likely destroy your personal Ubuntu configuration and prevent you from logging in, since many personal system and program settings are also stored in your /home folder. Searching for Files Nautilus includes a simple search tool. Click the Search button on the toolbar, and you will see a text box below the toolbar. In this text box, type any part of the filename you want to find. For example, typing festival will return any filenames with festival in them. By clicking the plus sign icon next to the Reload button after a search, you can specify an exact file type. To do this, click the Location drop-down list, and select File Type. Then click the Any drop-down list, and select the particular file type you want to find. For example, suppose you’re searching for a picture taken at a festival, and you know the filename contains the word festival. You also have various documents you created related to attending the festival, and their filenames also contain the word festival. In this case, to find only photo files, you can select Picture from the drop-down list, as shown in Figure 12-5.
- 323. CHAPTER 12 ■ MA NA GIN G YOUR FILES 287 ■Note The simple search tool in Nautilus is not as powerful as the Search for Files option, available from the Places menu. Figure 12-5. The Nautilus search function lets you filter by file type. File and Folder Icons Files and folders can have emblems assigned to them. These are smaller icons that are “tagged on” to the larger icons in both list view and icon view. Emblems are designed to give you quick clues about the nature of the file. To apply an emblem, right-click the file or folder, select Properties, and then click the Emblems tab. As shown in Figure 12-6, a range of icons is available; in fact, any file or folder can have several emblems applied at once. Simply put a check in the box beside the icons you wish to apply. Pick the ones that are meaningful to you. For example, a “cvs-conflict” emblem will probably be of interest only to programmers.
- 324. 288 CHAPTER 12 ■ MA NA GING YOUR FILES Nautilus makes use of a handful of emblem icons for its own needs, too. For example, a square with an X in it indicates that you don’t have permissions to access that file or folder at all—not even to view it. In most cases, the file system emblems are self-explanatory. ■Tip Want to have some fun with desktop icons? Right-click them, and select Stretch Icon. Then click and drag the handles at one of the corners. To restore an icon to its original size, right-click it, and select Restore Icon’s Original Size. Figure 12-6. A variety of miniature emblems can be applied to an icon to aid recognition of the file. Special Nautilus Windows As well as letting you view your files, Nautilus has a number of object modes. This is a complicated way of saying that Nautilus lets you view things other than files. The most obvious example of this is the Computer view of your file system, which presents an eagle’s eye view of your storage devices. To access this view, click Places ➤ Computer. If you have a card reader attached, it will appear here, as will any Windows partitions that may be on your hard disk. Double-clicking each item opens a standard
- 325. CHAPTER 12 ■ MA NA GIN G YOUR FILES 289 Nautilus file browser window (for this to work with Windows partitions, they must be set up correctly, as described in the “Accessing Windows Files” section later in this chapter). Another Nautilus object mode is the Fonts view, which lets you see at a glance any fonts installed on your computer. To access the Fonts view, click Go ➤ Location in any open Nautilus window, and then type fonts://. Object mode comes into its own when viewing network locations. Clicking Places ➤ Network Servers brings up the browsing network object view, for example, which is a little like Network Neighborhood or My Network Places under Windows. You can also browse to FTP sites by clicking Go ➤ Location in a file browser window and entering an FTP address (prefacing it with ftp://). ■Note You might be used to dragging and dropping files onto program windows or taskbar buttons within Windows in order to open the file. This works with only some programs within Ubuntu. Generally, the best policy is to try it and see what happens. If the program starts but your file isn’t opened, it obviously didn’t work. HIDDEN FILES AND DIRECTORIES When you view your /home directory via Nautilus, you’re not seeing every file that’s there. Several hidden files and directories relating to your system configuration also exist. You can take a look at them by clicking View ➤ Show Hidden Files in the Nautilus menu. Clicking this option again will hide the files and directories. You might notice something curious about the hidden items: they all have a period before their file- names. In fact, this is all that’s needed to hide any file or directory: simply place a period at the front of the filename. There’s no magic involved above and beyond this. For example, to hide the file partypicture.jpg, you could simply right-click it and rename it .partypicture.jpg. You’ll need to click the Reload button on the toolbar for the file view to be updated and for the file to disappear. As you might expect, removing the period will unhide the file. Files are usually hidden for a reason, and it’s no coincidence that most of the hidden files are system files. In addition, every program that you install, or installed by default, will usually create its own hidden folder for its system configuration data. Deleting such files by accident will usually result in losing your personal settings for that particular program. Launching Files and Running Programs As with Windows or Mac OS X, most of the programs on your Ubuntu system automati- cally associate themselves with various file types that they understand. For example, double-clicking a picture will automatically open the Eye of GNOME image viewer appli- cation, and double-clicking a .doc file will start OpenOffice.org Writer.
- 326. 290 CHAPTER 12 ■ MA NA GING YOUR FILES Ubuntu is automatically set up to view common file types. Table 12-1 shows which programs are required for viewing certain types of documents. ■Note Whenever you install new software from the installation CD or the official software repositories, it should add an entry to the Applications menu. If for some reason this doesn’t happen, you can create a shortcut using the techniques explained in Chapter 10. Table 12-1. Common File Types File Type File Extension Viewer Location on Applications Menu Word processor .doc, .rtf OpenOffice.org Writer Office ➤ OpenOffice.org Word document Processor Spreadsheet .xls OpenOffice.org Calc Office ➤ OpenOffice.org Spreadsheet Presentation .ppt OpenOffice.org Impress Office ➤ OpenOffice.org Presentation PDF file .pdf Evince Not on Applications menu1 Compressed file .zip, .tar, .gz, . File Roller Not on Applications menu1 bz2, and others Image file .jpg, .gif, .bmp, Eye of GNOME Not on Applications menu1 and others HTML file .htm, .html Firefox Internet ➤ Firefox Web Browser Text file .txt, .log Gedit Accessories ➤ Text Editor Audio file .wav, .mp3, .ogg2 Rhythmbox Sound & Video ➤ Rhythmbox Music Player .mpg, .mpeg, .avi2 Totem Sound & Video ➤ Movie Player Video file 1 Evince, File Roller, and Eye of GNOME are not present on the Applications menu. If you wish, you can add your own shortcuts for these applications by following the instructions in Chapter 10. 2 Playback of many media files is only possible after extra software is installed. See Chapters 18 and 19 for more information. If you want to temporarily open a file type with a different program, right-click the file, select Open with Other Application, and choose the other program. From that point on, every time you right-click, you’ll be offered the choice of that program to open the file. To make Nautilus automatically and permanently use the application to open the file type, right-click it and select Properties, and then click the Open With tab. Click the Add button to locate the application you wish to use if it’s not in the list. Finally, ensure the radio button alongside the program you wish to use is highlighted (you may need to click twice for this to happen), as shown in Figure 12-7, and then click the Close button.
- 327. CHAPTER 12 ■ MA NA GIN G YOUR FILES 291 ■Note Under Windows, you can use Windows Explorer to launch program executables by just browsing to their locations within Program Files and double-clicking their .exe files. It’s technically possible to run programs by browsing to their locations using Nautilus, but this is discouraged. One reason is that Ubuntu doesn’t store all of its programs in one central folder, as does Windows. However, most programs that are used on a daily basis can be found in /usr/bin. If the program itself isn’t stored in /usr/bin, it will contain a symbolic link (effectively, a shortcut) to the program’s genuine location on the hard disk. Figure 12-7. You can change which program opens a file by right-clicking, selecting Properties, and clicking the Open With tab. Accessing Windows Files Running Ubuntu on your PC makes you a relative stranger in a world of Windows users. It’s likely that you’ll need to access Windows files on a regular basis. If you’ve chosen to dual-boot with Windows, you might want to grab files from the Windows partition on your own hard disk. If your PC is part of a network, you might want to access files on a Windows-based server or workstation on which a shared folder has been created.
- 328. 292 CHAPTER 12 ■ MA NA GING YOUR FILES ■Note Accessing shared printers attached to Windows computers is explained in Chapter 8, in the “Configuring a Windows/SMB Shared Printer” section. Working with Files in Windows Partitions If you’ve chosen to dual-boot Ubuntu with Windows on the same hard disk, Ubuntu will attempt to make your Windows partitions available automatically. ■Note It’s possible for an installation of Windows 2000 or XP to use FAT32 instead of NTFS, but this requires the user to make a deliberate choice during setup. Unless you know your Windows 2000 or XP system has been formatted with FAT32, it’s very likely that it is NTFS. If the drive has automatically been made available, an icon for it should appear on the desktop. Double-clicking this should show your Windows partition contents. On a test system, the icon was identified by its partition designation, hda1. If you find that your Windows partition isn’t visible, you can follow these instructions to make it visible. This involves mounting the Windows partition under your Ubuntu file system. Mounting is explained in more detail in Chapter 14. 1. These instructions need to be carried out at the command prompt, so start by opening a GNOME Terminal Window: click Applications ➤ Accessories ➤ Terminal. 2. You need to identify the Unique Udev ID (UUID) number of your Windows partition. This is simply the hexadecimal number that Ubuntu uses to identify the drive inter- nally. If your computer is relatively new, it probably has an SATA hard disk, so type the following at the command prompt: sudo vol_id –u /dev/sda1 If you’re using an IDE (PATA) hard disk, type the following to determine the UUID number: sudo vol_id –u /dev/hda1 These instructions assume that the Windows partition is the first on the hard disk, which will be the case for most users. If you know the Windows partition is the second partition, replace /dev/sda1 or /dev/hda1 with /dev/sda2 or /dev/hda2. 3. You’ll be prompted to enter your password; do so.
- 329. CHAPTER 12 ■ MA NA GIN G YOUR FILES 293 4. Make a note of the output of the command. On our test PC, the line read 6284101A840FEEFB, but yours will almost certainly be different. 5. Now you need to create a mount point. This is a dummy folder that’s used to make the contents of the Windows partition magically available. The Ubuntu convention is to create a directory within the /media directory, as follows: sudo mkdir /media/Windows 6. You need to edit the /etc/fstab file. This is the configuration file that tells Ubuntu where to find all of the file systems it uses. This includes the root file system, without which Ubuntu can’t operate, so you should take extra care when editing this file. To load the file into the Gedit text editor, type the following: gksu gedit /etc/fstab 7. The file looks complicated, but don’t worry. Simply scroll to the bottom and press Enter to create a new line. Then type the following: UUID=<UUID> /media/Windows ntfs defaults,nls=utf8,umask=007,gid=46 0 0 Replace <UUID> with the hexadecimal number you noted earlier. For example, on our test PC, the line within fstab read as follows (see also Figure 12-8): UUID=6284101A840FEEFB /media/Windows ntfs defaults,nls=utf8, ➥ umask=007,gid=46 0 0 8. Click File ➤ Save within Gedit to save your changes. From now on, the Windows file system will be made available automatically whenever you boot, and it should appear as an icon both on the desktop and within the Computer view of Nautilus (click Places ➤ Computer to see it). However, you can mount it immedi- ately by typing the following command at the prompt: sudo mount /media/Windows ■Note You can write to or edit files in an NTFS partition. However, be aware that you could easily destroy your Windows partition because on Ubuntu, all Windows files (even the system-critical files) can be over- written without warning. On the positive side, this feature allows you to easily recover your files from Windows if it has crashed.
- 330. 294 CHAPTER 12 ■ MA NA GING YOUR FILES Figure 12-8. By editing the /etc/fstab file, you can make your Windows partition available under Ubuntu. Accessing Networked Files The easiest way to access shared folders on Windows workstations or servers over a network is to click Places ➤ Network. This will start Nautilus and attempt to search for Windows machines on your local network, just like with Network Neighborhood and My Network Places on the various versions of Windows. ■Tip When using this method, if the icon for a computer or workgroup is a blank sheet of paper, click the Refresh button on the toolbar. The icon should then change to a computer. In our tests, we found that we couldn’t access the network resource if the icon wasn’t set correctly. If you’ve ever used the network browsing services under Windows, you might already know how unreliable they can be—some computers simply don’t appear in the list, others appear eventually after a wait, and others appear but then prove to be mysteriously inaccessible.
- 331. CHAPTER 12 ■ MA NA GIN G YOUR FILES 295 A far quicker and more reliable method of accessing a Windows shared folder is to manually specify its network name or IP address. The network name is simply the name of the computer that’s used during networking. The IP address is the computer’s identifying number and usually takes the form of four octets separated by periods, like this: 192.168.1.4. You should try using the network name first when connecting to a computer. If that proves unreliable, try using the IP address instead. You can discover the network name and IP address as follows: Network name: You can discover the network name of a Windows Vista computer by clicking Start and right-clicking Network on the menu. Click Properties on the menu, and in the window that appears, look at the name of This Computer on the diagram beneath the Network and Sharing Center heading. For example, the name of our test PC is keir-pc. To discover the network name within Windows XP, right-click My Computer, select Properties, and then click the Computer Name tab in the window that appears. Look under the Full Computer Name heading. IP address: To find out the IP address, open an MS-DOS command prompt. To do this under Windows XP, click Start ➤ Run, and type cmd. Under Windows Vista, click the Start button and type cmd into the Start Search text box. Under both XP and Vista, type ipconfig at the prompt. Then, under XP, look for the line that reads “IP Address” and note the details. Under Windows Vista, look for the line that reads “IPv4 Address” and note the number (on our test computer, we had to scroll up the window to see the line). To access a shared folder, open a Nautilus file browser window (Places ➤ Home), and then click Go ➤ Location. In the box, type the following: smb://computer name/ Alternatively, if you wish to use the IP address, type the following: smb://IP address/ Obviously, in both cases, you should replace computer name and IP address with the details you noted earlier. You may also be prompted to enter a username and/or password to access the shared folder, as shown in Figure 12-9. ■Note If you’re accessing a Windows 95, 98, or Me shared folder, only password protection will have been set (these versions of Windows are unable to specify a username). However, when prompted by Nautilus, you still need to type something into the Username box to gain access—anything will do, as long as the password is correct. You cannot leave the Username box blank.
- 332. 296 CHAPTER 12 ■ MA NA GING YOUR FILES Figure 12-9. If the shared folder requires a username and/or password, you’ll be invited to enter these. To create a permanent desktop shortcut to the Windows folder, right-click a blank spot on the desktop and create a launcher. In the Command text box, enter nautilus, followed by the full network path to the share. You can discover this by browsing to the shared directory using Nautilus, as described previously, and then clicking the icon next to the location bar to switch to the text-mode view of the path. Then cut and paste the text into the Command box. For example, on our Ubuntu setup, we created a shortcut to the Pictures directory on the computer keir-office-pc by typing the following into the Command box: nautilus smb://keir-office-pc/pictures For more information about creating desktop launchers, see Chapter 10. When using the launcher after rebooting your Ubuntu system, you might notice the folder takes a few seconds to appear. This is normal and merely the result of the time Ubuntu takes to log on to the computer sharing the files.
- 333. CHAPTER 12 ■ MA NA GIN G YOUR FILES 297 Sharing a Folder from Within Ubuntu As well as accessing the shared files of other Windows users, you can also set up your own shared folder under Ubuntu for Windows users to access (or, indeed, other Ubuntu computers). To do this, follow these instructions: 1. Right-click the folder you wish to share, and select Sharing Options from the menu. 2. In the dialog box that appears, put a check in the Share This Folder checkbox. If this is the first time you’ve shared a folder, a dialog box will appear telling you the sharing service software is not installed. Click the Install Service button to add it. 3. You’ll be prompted to type your password because some additional software needs to be installed. Following this, Ubuntu will automatically download and install the Samba file-sharing components. 4. Once the installation has finished, cancel the Folder Sharing dialog box and log out of the computer (click System ➤ Quit ➤ Log Out). This performs some necessary background configuration. Then log back in again. 5. Right-click the folder you want to share again, and select Sharing Options again. Then put a check in Share This Folder again. 6. In the Share Name text box, type a name by which the share will be identified by other computers on the network. At the bottom of the dialog box you might see some warning messages. However, we found some of these were wrong or simply didn’t make sense. This is obviously a bug, and our advice is to ignore them. If you genuinely do something wrong, like type too long a share name, Ubuntu will tell you later on. 7. By checking Allow Other People to Write in This Folder, the shared folder will be made writeable, rather than read only. ■Caution Do not check the Guest Access box! At the time of writing, Ubuntu has a bug whereby allowing guest access (access without a username or password) results in files without ownership and with no read/ write permissions for anybody. Effectively, any files placed in the folder will be unreadable by you unless you manually alter their permissions and ownership. This is described in Chapter 29, but is a long and annoying process to have to go through for each file placed in the shared folder. 8. Click the Create Share button. A dialog box might appear saying that the permis- sions of the folder you wish to share need to be changed. Agree to this by clicking the Add the Permissions Automatically button.
- 334. 298 CHAPTER 12 ■ MA NA GING YOUR FILES Following this, Windows users can access the shared folder using My Network Places/ Network Neighborhood, where it should be “detected” alongside other Windows computers (under Vista, click Start ➤ Network). Users will be able to log in with your Ubuntu user- name and password. ■Note To access the shared folder from another Ubuntu computer, you might need to specify its IP address. To find out the IP address, open a GNOME Terminal window (Applications ➤ Accessories ➤ Terminal) and type ifconfig. Then look for the numbers alongside the inet addr entry. Accessing Removable Storage Devices Ubuntu automatically makes available any CDs or DVDs you insert into your computer, and they’ll appear instantly as icons on the desktop. The same is true of any card readers or USB memory devices that you use. Alternatively, you can access the storage devices by clicking Places ➤ Computer. Working in the Computer Window In the Places ➤ Computer window, you’ll find icons for all of the storage devices attached to your computer, including the floppy disk drive, as shown in Figure 12-10. However, because of the way floppy disk drives work, Ubuntu isn’t able to automatically detect if a floppy has been inserted. Instead, you’ll need to double-click the icon, as with Windows. ■Note In days of old, special tools were used to access MS-DOS floppies under Linux, and you might hear some Linux old-hands talking about them. Nowadays, you can simply use Nautilus without needing to take any special steps. Whenever you double-click any entry in the Computer window, it will open a Nautilus file browser window. You can copy files by clicking and dragging, and right-clicking files offers virtually all the options you could need. ■Tip You don’t need to use Places ➤ Computer each time to access your floppy, CD, or DVD drive. These drives are mounted in the /media folder on your hard disk. Just browse to /media/floppy, and /media/cdrom.
- 335. CHAPTER 12 ■ MA NA GIN G YOUR FILES 299 Figure 12-10. Select Places ➤ Computer to access your removable storage drives. Ejecting Media Ubuntu isn’t quite like Windows when it comes to ejecting or unplugging removable storage devices. In some cases, devices must be unmounted, which is to say that you need to tell Ubuntu that you’re finished with the device in question and that you’re about to unplug it. In the case of CD or DVD discs, you can simply press the Eject button on the drive itself. Ubuntu is able to detect that the disc is being ejected, so it will automatically unmount the drive. If the disc ever refuses to eject, right-click its icon on the desktop or within Computer and select Eject. In the case of floppy disks, USB memory sticks, and other USB storage devices, you should always right-click the icon and select Unmount Volume. Then you can unplug or remove the device. This also applies when you’re removing a memory card from a card reader—before pulling out the card from the reader, it needs to be unmounted. ■Note It’s necessary to close any files that were open on the device before unmounting, and even close any file browser windows that were accessing the device.
- 336. 300 CHAPTER 12 ■ MA NA GING YOUR FILES If you fail to unmount the device, Ubuntu will still believe the device is attached. This shouldn’t cause too many problems, but it could crash any programs that were accessing the device. It might also mean the card isn’t recognized properly when you reinsert it. In rare instances, data loss can occur. Summary This chapter has led you on your first steps in exploring the Linux file system. The file system is vitally important to how Linux works, and we’ll go into it in much depth in upcoming chapters. Here, you were introduced to elementary concepts, such as where personal files are stored and the basic rules that govern what you can and cannot do with files. We also looked at the principal method of accessing files via the GUI: the Nautilus file manager. Additionally, you learned how to run programs manually, as well as how to access any Windows partition or files that may exist on your hard disk or across a network. In Part 4 of this book, starting in the next chapter, we will look at some of the underlying technology that makes Ubuntu work, and how you can gain more control over your computer. Chapter 13 introduces the BASH shell—perhaps the most powerful piece of software offered by Ubuntu to control your system.
- 337. PART 4 ■■■ The Shell and Beyond
- 339. CHAPTER 13 ■■■ Introducing the BASH Shell A s you learned in Chapter 1, strictly speaking, the word Linux refers to just the kernel, which is the fundamental, invisible program that runs your PC and lets everything happen. However, on its own, the kernel is completely useless. It needs programs to let users interact with the PC and do cool stuff, and it needs a lot of system files (also referred to as libraries) to provide vital functions. The GNU Project provides many of these low-level pieces of code and programs. This is why many people refer to the Linux operating system as GNU/Linux, giving credit to the fact that, without the GNU components, Linux wouldn’t have gotten off the starting blocks. The GNU Project provides various shell programs, too. A shell is what the user interacts with on a day-to-day basis, whether by mouse or keyboard. The word originates from the fact that the shell is the outer layer of the operating system, which encompasses the kernel (and in some instances protects it by filtering out bad user commands!). Some shells offer graphical functionality but, in general, the word shell is understood to mean text-only interfaces. These text shell programs are also known as terminal programs, and they’re often colloquially referred to as command-line prompts, in reference to the most important component they provide. This kind of shell lets you take control of your system in a quick and efficient way. By learning how to use the shell, you’ll become the true master of your own system. In this part of the book, you’ll learn all you need to know about using the shell. This chapter introduces the BASH shell, which is the default one in Ubuntu. What Is the BASH Shell? The best way of explaining the BASH shell to a Windows user is to compare it to the DOS command prompt. It lets you issue commands directly to the operating system via the keyboard without needing to mess around with the mouse and windows (although it is sometimes possible to use the mouse within a BASH shell to copy and paste text, and sometimes to control simple text- based menus). The big difference is that the BASH shell has commands for just about everything you might do on your system, whereas the DOS 303
- 340. 304 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL command prompt is restricted to tools capable of manipulating and viewing files and directories, and on Windows 2000/XP/Vista machines, configuring certain system settings. In the old days, the DOS command prompt was also the visible layer of an entire oper- ating system in which DOS programs were designed to be run. However, the shell is merely one of the many ways of accessing the Linux kernel and subsystems. It’s true that many programs are designed to run via the BASH shell, but technically speaking, most actually run on the Linux operating system, and simply take input and show their output via the BASH shell. ■Note Linux purists will point out another reason why the shell isn’t exactly the same as a DOS command prompt within Windows: it doesn’t run in virtual machine mode, a CPU trick by which part of the memory is subdivided to let programs run as if they had the PC all to themselves. Linux finds itself with the BASH shell largely because Linux is a clone of Unix. In the early days of Unix, the text-based shell was all that was offered as a way of letting users control the computer. Typing in commands directly is one of the most fundamental ways of controlling any type of computer and, in the evolutionary scale, comes straight after needing to set switches and watch blinking lights in order to run programs. That the BASH shell can trace its history back to the early days of Unix might sound like a tacit indication that the BASH is somehow primitive—far from it. It’s one of the most efficient and immediate ways of working with your computer. Many people consider the command-line shell to be a way of using a computer that has yet to be superseded by a better method. ■Note When you run a shell on a Linux system, the system refers to it as a tty device. This stands for tele- typewriter, a direct reference to the old system of inputting data on what were effectively electronic typewriters connected to mainframe computers. These, in turn, took their names from the devices used to automate the sending and receiving of telegrams in the early part of the twentieth century. Most Linux distributions come with a choice of different kinds of shell programs. However, the default shell is BASH, as is the case in Ubuntu. BASH stands for Bourne Again SHell. This is based on the Bourne shell, a tried-and-tested program that originated in the early days of Unix. The other shells available include PDKSH (Public Domain Korn SHell, based on Korn Shell, another early Unix shell), and ZSH (Z SHell), a more recent addition. These are usually used by people who want to program Linux in various ways, or by those who simply aren’t happy with BASH.
- 341. C HA PTER 13 ■ INTRODUC IN G THE BAS H S HELL 305 The BASH shell is considered by many to be the best of all worlds in that it’s easy enough for beginners to learn, yet is able to grow with them and offer additional capabilities as necessary. BASH is capable of scripting, for example, which means you can even create your own simple programs. Why Bother with the Shell? You might have followed the instructions in Part 2 of this book and consider yourself an expert in Linux. But the real measure of a Linux user comes from your abilities at the shell. In our modern age, the GUI is mistakenly considered “progress.” For instance, users of the Microsoft and Apple-based operating systems are quite accustomed to using a mouse to navigate and perform various tasks. While it’s handy in certain situations—it would be difficult to imagine image editing without a mouse, for example—in many other situations, such as when manipulating files, directly typing commands is far more efficient. Most modern Linux distributions prefer you to use the GUI to do nearly everything. This is because they acknowledge the dominance of Windows and realize they need to cater to mouse users who might not even know the shell exists (and, of course, programs like web browsers would be unusable without a GUI!). To this end, they provide GUI tools for just about every task you might wish to undertake. Ubuntu is strong in this regard, and you can configure a lot of things from the desktop. However, it’s well worth developing at least some command-line shell skills, for a number of reasons: It’s simple and fast. The shell is the simplest and fastest way of working with Ubuntu. As just one example, consider the task of changing the IP address of your network card. You could click the Systems menu, then the Administration option, then the Networking option, and then double-click the entry in this list relating to your network card. That will take at least a minute or two if you know what you’re doing, and perhaps longer if it’s new to you. Alternatively, you could simply open a shell and type this: ifconfig eth0 192.168.0.15 up It’s versatile. Everything can be done via the shell—from deleting files, to configuring hardware, to creating MP3s. A lot of GUI programs actually make use of programs you can access via the shell. It’s consistent among distributions. All Linux systems have shells and understand the same commands (broadly speaking). However, not all Linux systems will have Ubuntu’s graphical configuration programs. SUSE Linux uses its own GUI configura- tion tool, as does Mandriva Linux. Therefore, if you ever need to use another system, or decide to switch distributions, a reliance on GUI tools will mean learning every- thing from scratch. Knowing a few shell commands will help you get started instantly.
- 342. 306 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL It’s crucial for troubleshooting. The shell offers a vital way of fixing your system should it go wrong. Your Linux installation might be damaged to the extent that it cannot boot to the GUI, but you’ll almost certainly be able to boot into a shell. A shell doesn’t require much of the system other than the ability to display characters on the screen and take input from the keyboard, which most PCs can do, even when they’re in a sorry state. This is why most rescue floppies offer shells to let you fix your system. It’s useful for remote access. One handy thing about the shell is that you don’t need to be in front of your PC to use it. Programs like ssh let you log in to your PC across the Internet and use the shell to control your PC (as described in Chapter 34). For example, you can access data on a remote machine, or even fix it when you’re unable to attend the machine’s location. This is why Linux is preferred on many server systems when the system administrator isn’t always present on the site. It’s respected in the community. Using a shell earns you enormous brownie points when speaking to other Linux users. It separates the wheat from the chaff and the men from the boys (or women from the girls). If you intend to use Linux profession- ally, you will most certainly need to be a master at the shell. Seen in this light, learning at least a handful of shell commands is vital to truly mastering your PC. The drawback when using a command-line shell is that it’s not entirely intuitive. Take for instance the command to change the network card’s IP address: ifconfig eth0 192.168.0.15 up If you’ve never used the shell before, it might as well be Sanskrit. What on earth does ifconfig mean? And why is there the word up at the end? ■Note If you’re curious, the command tells the network card, referred to by Linux as eth0, to adopt the specified IP address. The word up at the end merely tells it to activate—to start working now. If the word down were there instead, it would deactivate! Don’t worry about understanding all this right now; later in this chapter, we’ll explain how you can learn about every Linux command. Learning to use the shell involves learning terms like these. Hundreds of commands are available, but you really need to learn only around 10 or 20 for everyday use. The comparison with a new language is apt because, although you might think it daunting to learn new terminology, with a bit of practice, it will all become second nature. Once you’ve used a command a few times, you’ll know how to use it in the future. The main thing to realize is that the shell is your friend. It’s there to help you get stuff done as quickly as possible. When you become familiar with it, you’ll see that it is a beautiful concept. The shell is simple, elegant, and powerful.
- 343. C HA PTER 13 ■ INTRODUC IN G THE BAS H S HELL 307 When Should You Use the Shell? The amount of use the Linux shell sees is highly dependent on the user. Some Linux buffs couldn’t manage without it. They use it to read and compose e-mail, and even to browse the Web (usually using the Mutt and Lynx programs, respectively). However, most people simply use it to manage files, view text files (like program docu- mentation), and run programs. All kinds of programs—including GUI and command-line— can be started from the shell. As you’ll learn in Chapter 29, unlike with Windows, installing a program on Ubuntu doesn’t necessarily mean the program will automatically appear on the Applications menu. In fact, unless the installation routine is specifically made for the version of Linux you’re running, this is unlikely. Therefore, using the shell is a necessity for most people. ■Note Unlike with DOS programs, Ubuntu programs that describe themselves as “command-line” are rarely designed to run solely via the command-line shell. All programs are like machines that take input at one end and output objects at the other. Where the input comes from and where the output goes to is by no means limited to the command line. Usually, with a command-line program, the input and output are provided via the shell, and the programmer makes special dispensation for this, but this way of working is why GUI programs often make use of what might be considered shell programs. You’ll often find that a GUI program designed to, for example, burn CDs, will also require the installation of a command-line program that will actually do the hard work for it. There’s another reason why the shell is used to run programs: you can specify how a particular program runs before starting it. For example, to launch the Totem Movie Player in full-screen mode playing the myvideofile.mpg file, you could type this: totem --fullscreen myvideofile.mpg This saves the bother of starting the program, loading a clip, and then selecting the full- screen option. After you’ve typed the command once or twice, you’ll be able to remember it for the next time. No matter how much you love the mouse, you’ll have to admit that this method of running programs is more efficient. When you get used to using the shell, it’s likely you’ll have it open most of the time behind your other program windows. Getting Started with the Shell You can start the shell in a number of ways. The most common is to use a terminal emulator program. As its name suggests, this runs a shell inside a program window on your desktop.
- 344. 308 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL You can start GNOME Terminal, the built-in GNOME shell emulator, by clicking Applications ➤ Accessories ➤ Terminal, as shown in Figure 13-1. Figure 13-1. Start the The GNOME Terminal program from the Accessories submenu. You’ll see the terminal window—a blank, white window that’s similar to a simple text editor window. When you run the terminal for the first time, at the top of the window will be a handful of lines telling you about the sudo command. We explain the importance of this in Chapter 14, but right now there’s no need to worry about it. Below this will be the most important component of the terminal window—the command prompt: a few words followed by the dollar symbol: $. On our test system, this is what we see: keir@keir-desktop:~$ The first part is the username—the user account we created during installation and use to log in to the PC. After the @ sign is the hostname of the PC, which we also chose when installing Ubuntu. The hostname of the PC isn’t important on most desktop PCs; it’s a legacy from the days of Unix. ■Note What’s with the @ sign? Again, it’s a legacy from the days of Unix when the hostname referred to the site the computer was located at (such as the university or military facility). Reading the command prompt in this context, the line reads that the user keir is logged into the computer located at the location specified in the hostname! Like we said, this is a legacy of Unix’s origins and doesn’t mean much nowadays. After the colon is the current directory you’re browsing. In this example, the ~ symbol appears instead of an actual path or directory name. This is merely Linux shorthand for
- 345. C HA PTER 13 ■ INTRODUC IN G THE BAS H S HELL 309 the user’s home directory. In other words, wherever we see a ~ on our test PC, we read it as /home/keir/. After this is the dollar symbol ($), which indicates that we’re currently logged in as an ordinary user, as opposed to the root user. However, unlike most other Linux distributions, Ubuntu doesn’t use the root account during day-to-day operations, so this is a moot point. Finally, there is a cursor, and this is where you can start typing commands! ■Note If you were to log in as root, a hash (#) would appear instead of the dollar symbol prompt. This is important to remember, because often in magazines and some computer manuals, the use of the hash symbol before a command indicates that it should be run as root. In addition, if you use the rescue function of the install CD, you’ll be running as root, and a hash will appear at the prompt. See Chapter 14 for more information about the root user. Running Programs When we refer to commands at the shell, we’re actually talking about small programs. When you type a command to list a directory, for example, you’re actually starting a small program that will do that job. Seen in this light, the shell’s main function is to simply let you run programs—either those that are built into the shell, such as ones that let you manipulate files, or other, more complicated programs that you’ve installed yourself. The shell is clever enough to know where your programs are likely to be stored. This information was given to it when you first installed Ubuntu and is stored in a system variable. ■Note A variable is the method Linux uses to remember things like names, directory paths, or other data. There are many system variables that are vital for the running of Ubuntu. These variables can be seen by typing set at the command prompt. The information about where your programs are stored, and therefore where Ubuntu should look for commands you type in, as well as any programs you might want to run, is stored in the PATH variable. You can take a look at what’s currently stored there by typing the following: echo $PATH Don’t forget that the difference between uppercase and lowercase letters matters to Ubuntu, unlike with Windows and DOS. The echo command merely tells the shell to print something on screen. In this case, you’re telling it to “echo” the PATH variable onto your screen. On our test PC, this returned the following information:
- 346. 310 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11: ➥ /usr/games Several directories are in this list, each separated by a colon. Don’t worry too much about the details right now. The important thing to know is that whenever you type a program name, the shell looks in each of the listed directories in sequence. In other words, when you type ls, the shell will look in each of the directories stored in the PATH variable, starting with the first in the list, to see if the ls program can be found. The first instance it finds is the one it will run. (The ls command gives you a directory listing, as described in the “Listing Files” section later in this chapter.) But what if you want to run a program that is not contained in a directory listed in your PATH? In this case, you must tell the shell exactly where the program is. Here’s an example: /home/keir/myprogram This will run a program called myprogram in the /home/keir directory. It will do this regardless of the directory you’re currently browsing, and regardless of whether there is anything else on your system called myprogram. If you’re already in the directory where the program in question is located, you can type the following: ./myprogram So, just enter a dot and a forward slash, followed by the program name. The dot tells BASH that what you’re referring to is “right here.” Like the tilde symbol (~) mentioned earlier, this dot is BASH shorthand. Getting Help Each command usually has help built in, which you can query (a little like typing /? after a command when using DOS). This will explain what the command does and how it should be used. In most cases, you’ll see an example of the command in use, along with the range of command options that can be used with it. For example, you can get some instant help on the ifconfig command by typing this: ifconfig --help You’ll see the help screen shown in Figure 13-2. The --help option is fairly universal, and most programs will respond to it, although sometimes you might need to use a single dash. Just type the command along with --help to see what happens. You’ll be told if you’re doing anything wrong. In addition, most commands have manuals that you can read to gain a fairly complete understanding of how they work. Virtually every Ubuntu setup has a set of these man pages, which can be accessed by typing this: man <command>
- 347. C HA PTER 13 ■ INTRODUC IN G THE BAS H S HELL 311 However, man pages are often technical and designed for experienced Ubuntu users who understand the terminology. Figure 13-2. Most commands contain built-in help to give you a clue as to how they’re used. Some commands also have info pages, which offer slightly more down-to-earth guides. You can read these by typing this: info <command> If a command isn’t covered by the info system, you’ll be shown the default screen explaining basic facts about how the info command works. Note that both man and info have their own man and info pages, explaining how they work. Just type man man or info info. We explain how to read man and info pages in Appendix C. Running the Shell via a Virtual Console As noted earlier, you can start the shell in a number of ways. The most common way among Linux diehards is via a virtual console. To access a virtual console, press Ctrl+Alt, and then press one of the function keys from F1 through F6 (the keys at the top of your keyboard). Using a virtual console is a little like switching desks to a completely different PC. Pressing Ctrl+Alt+F1 will cause your GUI to disappear, and the screen to be taken over by a
- 348. 312 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL command-line prompt (don’t worry; your GUI is still there and running in the background). You’ll be asked to enter your username and your password. Any programs you run in a virtual console won’t affect the rest of the system, unless they’re system commands. (As discussed in Chapter 16, one way to rescue a crashed GUI program is to switch to a virtual console and attempt to terminate the program from there.) You can switch back to the GUI by pressing Ctrl+Alt+F7. Don’t forget to quit your virtual console when you’re finished with it, by typing exit. BOOTING INTO THE SHELL If you’re really in love with the shell, you can choose to boot into it, avoiding the GUI completely (although you can later start the GUI by typing startx at the command line). Booting into the shell is done by defining a custom run level. A run level is how the operating mode that Ubuntu is currently running in is described. For example, one particular run level might start a GUI, while another might start only a command prompt. There are usually seven run levels under Linux, numbered from 0 to 6. Not all of them do something interesting. On Ubuntu, run levels 2 through 5 are all the same. Each runs the GUI. Run level 1 runs a command prompt, so it might seem ideal for booting into the shell, but it also shuts down a few essential services. This means it isn’t suitable for day-to-day use. The trick is to take one of the existing run levels and alter it slightly so that it doesn’t run a GUI by default. On many distributions, run level 3 is reserved for this purpose, so it makes sense to alter it under Ubuntu. (For what it’s worth, the default Ubuntu run level is 2.) Stopping Ubuntu from running a GUI upon booting is simply a matter of stopping the program that appears when Ubuntu boots—GDM. This provides the login window that appears and starts the whole graphical subsystem. Type the following command at the shell to remove the shortcut to GDM within the run level 3 configuration: sudo rm /etc/rc3.d/S13GDM After this, you’ll need to tell Ubuntu to boot straight to run level 3, rather than the default of 2. You do this by creating the /etc/inittab file, which then becomes one of the first configuration files Ubuntu reads when booting. Issue the following command at the shell to create and then open the file in the Gedit text editor: gksu gedit /etc/inittab Then add the following line at the top of the file: id:3:initdefault: Then save the file. From now on, you’ll always boot straight to a BASH prompt. To restore things to the way they were, simply delete the /etc/inittab file by typing the following at the prompt: sudo rm /etc/inittab
- 349. C HA PTER 13 ■ INTRODUC IN G THE BAS H S HELL 313 Working with Files So let’s start actually using the shell. If you’ve ever used DOS, then you have a head start over most shell beginners, although you’ll still need to learn some new commands. Table 13-1 shows various DOS commands alongside their Ubuntu equivalents. This table also serves as a handy guide to some BASH commands, even if you’ve never used DOS. In Appendix B, you’ll find a comprehensive list of useful shell commands, together with explanations of what they do and examples of typical usage. Table 13-1. DOS Commands and Their Shell Equivalents Command DOS Command Linux Shell Usage Command Copy files COPY cp cp <filename> <new location> Move files MOVE mv mv <filename> <new location> Rename files RENAME mv mv <old filename> <new filename>1 Delete files DEL rm rm <filename>2 Create directories MKDIR mkdir mkdir <directory name> Delete directories DELTREE/RMDIR rm rm –rf <directory name> Change directory CD cd cd <directory name> Edit text files EDIT vi vi <filename> View text files TYPE less less <filename>3 Print text files PRINT lpr lpr <filename> Compare files FC diff diff <file1> <file2> Find files FIND find find –name <filename> Check disk integrity SCANDISK fsck fsck4 View network settings IPCONFIG ifconfig ifconfig Check a network connection PING ping ping <address> View a network route TRACERT tracepath tracepath <address> Clear screen CLS clear clear Get help HELP man man <command>5 Quit EXIT exit exit 1 The BASH shell offers a rename command, but this is chiefly used to rename many files at once. 2 To avoid being asked to confirm each file deletion, you can add the -f option. Be aware that the rm command deletes data instantly, without the safety net of the Recycle Bin, as with the GNOME desktop. 3 Use the cursor keys to move up and down in the document. Type Q to quit. 4 This is a system command and can be run only on a disk that isn’t currently in use. To scan the main parti- tion, you’ll need to boot from the installation CD and select the rescue option. Then issue the fsck command. 5 The info command can also be used.
- 350. 314 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL CREATING ALIASES If you’ve ever used DOS, you might find yourself inadvertently typing DOS commands at the shell prompt. Some of these will actually work, because most distribution companies create command aliases to ease the transition of newcomers to Linux. Aliases mean that whenever you type certain words, they will be interpreted as meaning something else. However, an alias won’t work with any of the command-line switches used in DOS. In the long run, you should try to learn the BASH equivalents. You can create your own command aliases quickly and simply. Just start a BASH shell and type the following: alias <DOS command>='<Linux shell command>' For example, to create an alias that lets you type del instead of rm, type this: alias del='rm' Note that the Ubuntu command must appear in single quotation marks. To make aliases permanent, you need to add them to your .bashrc file. Open the file in the Gedit text editor by typing the following: gedit .bashrc At the bottom of the file, add new lines for all the aliases you want to make permanent. Simply type the command shown previously. Save the file when you’ve finished. Note that the aliases won’t go into effect until you open a new terminal window or reboot the computer. Listing Files Possibly the most fundamentally useful BASH command is ls. This will list the files in the current directory, as shown in Figure 13-3. If you have a lot of files, they might scroll off the screen. If you’re running GNOME Terminal, you can use the scroll bar on the right side of the window to view the list. Having the files scroll off the screen can be annoying, so you can cram as many as possible onto each line by typing the following: ls -m The dash after the command indicates that you’re using a command option. These are also referred to as command-line flags or switches. Nearly all shell commands have options like this. In fact, some commands won’t do anything unless you specify various options. In the case of the ls command, only one dash is necessary, but some commands need two dashes to indicate an option.
- 351. C HA PTER 13 ■ INTRODUC IN G THE BAS H S HELL 315 Figure 13-3. The ls command lists the files in the current directory. You can see a list of all the command options for ls by typing the following (ironically, itself a command option): ls --help Once again, the output will scroll off the screen, and you can use the window’s scroll bars to examine it. (In Chapter 17, you’ll learn a trick you can use to be able to read this output without needing to fiddle around with the scroll bars, even if there’s screen after screen of it.) With most commands, you can use many command options at once, as long as they don’t contradict each other. For example, you could type the following: ls –lh This tells the ls command to produce “long” output and also to produce “human- readable” output. The long option (-l) lists file sizes and ownership permissions, among other details (permissions are covered in the next chapter). The human-readable option (-h) means that rather than listing files in terms of bytes (such as 1029725 bytes), it will list them in kilobytes and megabytes. Notice that you can simply list the options after the dash; you don’t need to give each option its own dash.
- 352. 316 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL ■Caution Don’t forget that case-sensitivity is vitally important in Ubuntu! Typing ls –L is not the same as typing ls –l. It will produce different results. Copying Files and Directories Another useful command for dealing with files is cp, which copies files. You can use the cp command in the following way: cp myfile /home/keir/ This will copy the file to the location specified. One important command-line option for cp is –r. This stands for recursive and tells BASH that you want to copy a directory and its contents (as well as any directories within this directory). Most commands that deal with files have a recursive option. ■Note Only a handful of BASH commands default to recursive copying. Even though it’s extremely common to copy folders, you still need to specify the -r command option most of the time. One curious trick is that you can copy a file from one place to another but, by specifying a filename in the destination part of the command, change its name. Here’s an example: cp myfile /home/keir/myfile2 This will copy myfile to /home/keir, but rename it as myfile2. Be careful not to add a final slash to the command when you do this. In the example here, doing so would cause BASH to think that myfile2 is a directory. This way of copying files is a handy way of duplicating files. By not specifying a new location in the destination part of the command, but still specifying a different filename, you effectively duplicate the file within the same directory: cp myfile myfile2 This will result in two identical files: one called myfile and one called myfile2. Moving Files and Directories The mv command is similar to cp, except that rather than copying the file, the old one is removed. You can move files from one directory to another, for example, like this: mv myfile /home/keir/
- 353. C HA PTER 13 ■ INTRODUC IN G THE BAS H S HELL 317 You can also use the mv command to quickly rename files: mv myfile myfile2 Figure 13-4 shows the results of using mv to rename a file. The mv command can be used to move a directory in the same way as with files. However, there’s no need to use a command option to specify recursivity, as with other commands. For instance, to move the directory daffodil into the directory flowers, you could type the following (assuming both directories are in the one you’re currently browsing): mv daffodil/ flowers/ Note the use of the slash after each directory. To rename directories, simply leave off the slashes. To rename the directory daffodil to hyacinth, for example, you could type the following: mv daffodil hyacinth ■Note Getting technical for a moment, moving a file in Linux isn’t the same as in Windows, where a file is copied and then the original deleted. Under Ubuntu, the file’s absolute path is rewritten, causing it to simply appear in a different place in the file structure. However, the end result is the same. Figure 13-4. You can also use the mv command to rename files.
- 354. 318 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL Deleting Files and Directories But how do you get rid of files? Again, this is relatively easy, but first a word of caution: the shell doesn’t operate any kind of Recycle Bin. Once a file is deleted, it’s gone forever. (There are utilities you can use to recover files, but these are specialized tools and aren’t to be relied on for day-to-day use.) Removing a file is achieved by typing something like this: rm myfile It’s as simple as that. In some instances,you’ll be asked to confirm the deletion after you issue the command. If you want to delete a file without being asked to confirm it, type the following: rm –f myfile The f stands for force (that is, force the deletion). If you try to use the rm command to remove a directory, you’ll see an error message. This is because the command needs an additional option: rm –rf mydirectory As noted earlier, the r stands for recursive and indicates that any folder specified after- ward should be deleted, in addition to any files it contains. ■Tip You might have used wildcards within Windows and DOS. They can be used within Ubuntu, too. For example, the asterisk (*) can be used to mean any file. So, you can type rm –f * to delete all files within a directory, or type rm –f myfile* to delete all files that start with the word myfile. But remember to be careful with the rm command. Keep in mind that you cannot salvage files easily if you accidentally delete them! WORKING WITH FILES WITH SPACES IN THEM If, at the command prompt, you try to copy, move or otherwise manipulate files that have spaces in their names, you’ll run into problems. For example, suppose you want to move the file picture from germany.jpg to the directory mydirectory. In theory the following command should do the trick: mv picture from germany.jpg mydirectory/ But when we tried it on our test Ubuntu setup, we got the following errors: mv: cannot stat 'picture': No such file or directory mv: cannot stat 'from': No such file or directory mv: cannot stat 'germany.jpg': No such file or directory
- 355. C HA PTER 13 ■ INTRODUC IN G THE BAS H S HELL 319 In other words, BASH had interpreted each word as a separate file and tried to move each of them! The error messages tell us that BASH cannot find the file picture, from, or germany.jpg. There are two solutions. The easiest is to enclose the filename in quotation marks ("), so the previous command would read as follows: mv "picture from germany.jpg" mydirectory/ The other solution is to precede each space with a backslash. This tells BASH you’re including a literal character in the filename. In other words, you’re telling BASH not to interpret the space in the way it normally does, which is as a separator between filenames or commands. Here’s how the command looks if you use backslashes: mv picture from germany.jpg mydirectory/ The backslash can also be used to stop BASH from interpreting other symbols in the way it normally does. For example, the less than and greater than symbols (<>) have a specific meaning in BASH, which we discuss in Chapter 17, but they’re allowed in filenames. So to copy the file <bach>.mp3 to the direc- tory mydirectory, you could type: cp <bach>.mp3 mydirectory/ Generally speaking, however, simply enclosing filenames in quotation marks is the easiest approach. Changing and Creating Directories Another handy command is cd, for change directory. This lets you move around the file system, from directory to directory. Say you’re in a directory that has another directory in it, named mydirectory2. Switching to it is easy: cd mydirectory2 But how do you get out of this directory once you’re in it? Try the following command: cd .. The .. refers to the “parent” directory, which is the one containing the directory you’re currently browsing. Using two dots to indicate this may seem odd, but it’s just the way that Ubuntu (and Unix before it) does things. It’s one of the many conventions that Unix relies on and that you’ll pick up as you go along. You can create directories with the mkdir command: mkdir mydirectory
- 356. 320 CHAPTER 13 ■ INTRODUC ING THE BA SH S HELL What if you want to create a new directory and, at the same time, create a new directory to contain it? Simply use the -p command option. The following command will create a new folder called flowers and, at the same time, create a directory within flowers called daffodil: mkdir -p flowers/daffodil Summary This chapter introduced the command-line shell, considered by many to be the heart of Linux. We’ve discussed its similarities to MS-DOS, and shown that these are only cursory; knowledge of DOS doesn’t equate to skill within BASH. In the long run, you should work to polish your BASH skills. This chapter also introduced some elementary commands used within BASH, such as those used to provide directory listings and to copy files. We looked at how you can use command-line options to control BASH tools. In many cases, these are mandatory, so you learned how the BASH shell itself can be used to investigate a command and find out vital information about how it works. At this point, your newfound knowledge will have no doubt caused you to venture into the Ubuntu file system itself, which can be a confusing, if not terrifying, place for the inexperienced. But don’t worry. The next chapter explains everything you need to know about the file system and what you’ll find in it.
- 357. CHAPTER 14 ■■■ Understanding Linux Files and Users M ost of us are used to dealing with files—the things that live on our hard disks, floppies, and DVD-ROMs, and contain data and program code. It should come as no surprise that Linux has its own file structure, which is different from Windows, in terms of where data is stored and also the underlying technology. Taking a page from Unix, Ubuntu takes the concept of the file system to an extreme. To Ubuntu, almost everything is treated as a file: your PC’s hardware, network computers connected to your PC, information about the current state of your computer—almost everything finds a home within the Linux file system. Linux places an equal emphasis on the users of the system. They own the various files and can decide who can and cannot access various files that they create or that are trans- ferred to their ownership. In this chapter, we’ll delve into users, files, and permissions. You’ll be introduced to how Ubuntu handles files and how files are tied into the system of user accounts. Real Files and Virtual Files Linux sees virtually everything as a series of files. This might sound absurd and certainly requires further explanation. Let’s start with the example of plugging in a piece of hardware. Whenever you attach something to a USB socket, the Linux kernel finds it, sees if it can make the hardware work, and if everything checks out okay, it will usually make the hardware available as a file under the /dev directory on your hard disk (dev is short for devices). Figure 14-1 shows an example of a /dev directory. The file created in the /dev directory is not a real file, of course. It’s a file system shortcut plumbed through to the input and output components of the hardware you’ve just attached. 321
- 358. 322 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS ■Note As a user, you’re not expected to delve into the /dev directory and deal with this hardware directly. Most of the time, you’ll use various software packages that will access the hardware for you or use special BASH commands or GUI programs to make the hardware available in a more accessible way for day-to-day use. Figure 14-1. Hardware devices under Linux are accessed as if they were files and can be found in the /dev folder. Here’s another example. Say you’re working in an office, and you want to connect to a central file server. To do this under Linux, you must mount the files that the server offers, making it a part of the Ubuntu file system. Doing this involves creating an empty directory (or using one that already exists) and using the mount command at the BASH shell to make the server’s contents magically appear whenever that directory is accessed. We’ll discuss how this is done later in this chapter, in the “Mounting” section. ■Note Bear in mind that, in most cases, Ubuntu takes care of mounting automatically, as discussed in Chapter 12. For example, when you try to connect to a shared folder by clicking Places ➤ Network Servers, Ubuntu will automatically handle the mounting of the shared folder.
- 359. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 323 Once the network server is mounted, it is treated exactly like a directory on your hard disk. You can copy files to and from it, just as you would normally, using the same tools as you use for dealing with any other files. In fact, less knowledgeable users won’t even be aware that they’re accessing something that isn’t located on their PC’s hard disk (or, technically speaking, within their Ubuntu partition and file system). By treating everything as a file, Linux makes system administration easier. To probe and test your hardware, for example, you can use the same tools you use to manipulate files. So how do you know which files are real and which are virtual? One method is to use the following command, which was introduced in the previous chapter: ls -l The -l option tells the ls command to list nearly all the details about the files. If you do this in GNOME Terminal, you’ll see that the listing is color-coded. There are many different combinations of colors, but Table 14-1 shows some typical examples that you’re likely to come across. The ls -l command returns a lot of additional information, including who owns which file and what you and others can do with it. This requires an understanding of users and file permissions, which we’ll discuss next. ■Tip The command ls -la will give you even more information—perhaps too much for general use. In most instances, ls -l should show enough information. Table 14-1. Color-Coding Within GNOME Terminal Color Type of File Black text Standard file Light-blue text Directory Black outline with yellow text Virtual device1 Green text Program or script2 Cyan text Symbolic link to another file3 Pink text Image file Red text Archive4 1 This is found only in the /dev directory. 2 Technically speaking, green text indicates a program or script that has merely been marked as being executable. 3 This is similar to a Windows desktop shortcut. 4 Installation files are also marked red, because they’re usually contained in archives.
- 360. 324 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS Users and File Permissions The concept of users and permissions is as important to Ubuntu as the idea of a central and all-encompassing file system. In fact, the two are implicitly linked. When initially installing Linux, you should have created at least one user account. By now, this will have formed the day-to-day login that you use to access Linux and run programs. Although you might not realize it, as a user, you also belong to a group. In fact, every user on the system belongs to a group. Under Ubuntu, ordinary users belong to a group based on their usernames (under other versions of Linux, you might find that you belong to a group called users). ■Note Groups are yet another reminder of Ubuntu’s Unix origins. Unix is often used on huge computer systems with hundreds or thousands of users. Putting each user into a group makes the system adminis- trator’s job a lot easier. When controlling system resources, the administrator can control groups of users rather than hundreds of individual users. On most home user PCs, the concept of groups is a little redundant, because there’s normally a single user, or at most, two or three. However, the concept of groups is central to the way that Linux handles files. A standard user account under Ubuntu is normally limited in what it can do. As a standard user, you can save files to your own private area of the disk, located in the /home directory, but usually nowhere else. You can move around the file system, but some directories are strictly out of bounds. In a similar way, some files can be opened as read-only, so you cannot save changes to them. All of this is enforced using file permissions. Every file and directory is owned by a user. In addition, files and directories have three separate settings that indicate who within the Linux system can read them, who can write to them, and, if the file in question is “runnable” (usually a program or a script), who can run it (execute it). In the case of directories, it’s also possible to set who can browse them, as well as who can write files to them. If you try to access a file or directory for which you don’t have permission, you’ll be turned away with an “access denied” error message. ROOT VS. SUDO Most versions of Linux have two types of user accounts: standard and root. Standard users are those who can run programs on the system but are limited in what they can do. Root users have complete run of the system, and as such, are often referred to as “superusers.” They can access and/or delete what- ever files they want. They can configure hardware, change settings, and so on.
- 361. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 325 Most versions of Linux create a user account called root and let users log in as root to perform system maintenance. However, for practical as well as security reasons, most of the time the user is logged in as a standard user. Ubuntu is different in that it does away with the root account. Instead, it allows certain users, including the one created during installation, to temporarily adopt root-like powers. You will already have encountered this when configuring hardware. As you’ve seen, all you need to do is type your password when prompted in order to administer the system. This way of working is referred to as sudo, which is short for “superuser do.” In fact, the command sudo will let you adopt root powers at the shell prompt—simply preface any command with sudo in order to run it with root privileges. (A different command is normally used if you want to run graphical applications from the shell prompt—gksu. However, the effect is the same.) Ubuntu remembers when you last used sudo too, so that it won’t annoy you by asking you again for your password wtihin 15 minutes of its first use. You can avoid this grace period by typing sudo -k. In some ways, the sudo system is slightly less secure than using a standard root account. But it’s also a lot simpler. It reduces the chance of serious errors, too. Any command or tweak that can cause damage will invariably require administrative powers, and therefore require you to type your password or preface the command with sudo. This serves as a warning and prevents mistakes. If you’re an experienced Linux user and want to invoke the root account, simply type the following at the command prompt: sudo passwd root Then, type a password. If you subsequently want to deactivate the root account, type this: sudo passwd -l root If you ever want to slip into the root account for a short period, even if you haven’t followed the previous instructions to activate the root account login, you can do so by typing the following: sudo su You’ll be prompted to type your password; do so. When you’ve finished, type exit to return to your standard user account. Viewing Permissions When you issue the ls -l command, each file is listed on an individual line. Here’s an example of one line of a file listing from our test PC: -rw-r--r-- 2 keir keir 673985982 2006-11-31 17:19 myfile
- 362. 326 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS The r, w, and – symbols on the very left of the listing indicate the file permissions. The permission list usually consists of the characters r (for read), w (for write), x (for execute), or - (meaning none are applicable). They’re followed by a number indicating the link count, which indicates how many hard/soft links have been made to the file, but you can ignore this for the moment (for more information about file links, see the “Creating File Links” sidebar). After this is listed the owner of the file (keir in the example) and then the group that also has permission to access the file (in this case, the group is also called keir). This is followed by the file size (in bytes), the date and time the file was last accessed, and finally, the filename itself appears. The file permissions part of the listing might look confusing, but it’s actually quite simple. To understand what’s going on, you need to split it into groups of four, as illus- trated in Figure 14-2. Figure 14-2. The file permissions part of a file listing can be broken down into four separate parts. The four groups are as follows: Type of file: This character represents the file type. A standard data file is indicated with a dash (-). Most files on your system fall into this category. A d shows that the entry is not a file but a directory. Table 14-2 lists the file type codes. User permissions: Next come the permissions of the person who owns the file. The three characters indicate what the person who owns the file can do with it. The owner of a file is usually the user who created it, although it’s also possible to change the owner later on. In this example, you see rw-. This means that the owner of the file can read (r) and write (w) the file. In other words, he can look at it and also save changes to it. However, there’s a dash afterward, and this indicates that the user cannot execute the file. If this were possible, there would be an x in this spot instead.
- 363. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 327 Group permissions: After the owner’s permissions are the permissions given to the specified group. This is indicated by another three characters in the same style as those for user permissions. In the example, the group’s permission is r--, which means that the members of the specified group can read the file but don’t have permission to write to it, since there’s a dash where the w would normally appear. In other words, as far as they’re concerned, the file is read-only. Everyone else’s permissions: The last set of permissions indicates the permissions of everyone else on the system (other users in other groups). In the example, they can only read the file (r); the two dashes afterward indicate that they cannot write to the file nor execute it. Table 14-2. File Type Codes Code File Type - Standard file d Standard directory l Symbolic link (a shortcut to another file) p Named pipe (a file that acts as a conduit for data between two programs) s Socket (a file designed to send and receive data over a network) c Character device (a hardware device driver, usually found in /dev) b Block device (a hardware device driver, usually found in /dev) As you might remember from Windows, programs are stored as files on your hard disk, just like standard data files. On Linux, program files need to be explicitly marked as being executable. This is indicated in the permission listing by an x. Therefore, if there’s no x in a file’s permissions, it’s a good bet that the file in question isn’t a program or script (although this isn’t always true for various technical reasons). To make matters a little more confusing, if the entry in the list of files is a directory (indicated by a d), then the rules are different. In this case, an x indicates that the user can access that directory. If there’s no x, then the user’s attempts to browse to that directory will be met with an “access denied” message. File permissions can be difficult to understand, so let’s look at a few real-world examples. These examples assume that you’re logged in to Linux as the user keir.
- 364. 328 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS LESS COMMON FILE PERMISSIONS Instead of the x or dash in the list of permissions for a directory, you might sometimes see a t. This is referred to as the “sticky bit” and means that the only people who can delete or alter a file in that directory are the users who created the file in the first place. This is a useful option to have in some circumstances. It’s used with the /tmp (temporary) folder, for example, to ensure that one user can’t delete another user’s temporary files but is able to delete his own temporary files. To set the sticky bit for a directory, type chmod +t directoryname. You might sometimes see a set of permissions like rws. The s stands for “set user id” and is often referred to as the “suid bit”. Like x, it indicates that the file is executable, except in this case, it means that the file will be run with the permissions of the person who owns it, rather than the user who is executing it. In other words, if user frank tries to run a program owned by keir that has the execute permission set as s, that program will be run as if keir were running it. This is very useful, because it can make programs that require root powers usable by ordinary users, although this brings with it obvious security risks. To set the suid bit, type chmod +s filename. However, it’s very unlikely you’ll ever need to use this command. Typical Data File Permissions Here’s the first example: -rw-rw---- 2 keir keir 1450 2006-07-07 09:19 myfile2 You see immediately that this file is owned by user keir, because that username appears directly after the permissions. You also see that the group keir has access to the file, although precisely how much depends on the permissions. Reading the file permissions from left to right, you see that the initial character is a dash. That indicates that this is an ordinary file and has no special characteristics. It’s also not a directory. After that is the first part of the permissions, rw-. These are the permissions for the owner of the file, keir. You’re logged in as that user, so this file belongs to you, and these permissions apply to you. You can read and write the file but not execute it. Because you cannot execute the file, you can infer that this is a data file rather than a program (there are certain exceptions to this rule, but we’ll ignore them for the sake of simplicity). Following this is the next part of the file permissions, rw-. This tells you what members of the group called keir can do with the file. It’s fairly useless information if you’re the only user of your PC, but for the record, you’re told that anyone else belonging to the group called keir can also read and write the file but not execute it. If you’re not the only user of a computer, group permissions can be important. The “Altering Permissions” section,
- 365. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 329 coming up shortly, describes how to change file permissions to control who can access files. Finally, the last three characters tell you the permissions of everyone else on the system. The three dashes (---) mean that they have no permissions at all regarding the file. There’s a dash where the r normally appears, so they cannot even read it. The dashes afterward tell you they cannot write to the file or execute it. If they try to do anything with the file, they’ll get a “permission denied” error. Permissions on a User’s Directory Here’s example number two: drwxr-xr-x 7 keir keir 824 2006-07-07 10:01 mydirectory The list of permissions starts with d, which tells you that this isn’t a file but a directory. After this is the list of permissions for the owner of the directory (keir), who can read files in the directory and also create new ones there. The x indicates that you can access this directory, as opposed to being turned away with an “access denied” message. You might think being able to access the directory is taken for granted if the user can read and write to it, but that’s not the case. Next are the permissions for the group members. They can read files in the directory but not write any new ones there (although they can modify files already in there, provided the permissions of the individual files allow this). Once again, there’s an x at the end of their particular permission listing, which indicates that the group members can access the directory. Following the group’s permissions are those of everyone else. They can read the directory and browse it, but not write new files to it, as with the group users’ permissions. Permissions on a Directory Owned by Root Here’s the last example: drwx------ 25 root root 1000 2004-08-06 15:44 root You can see that the file is owned by root. Remember that in this example, you’re logged in as keir and your group is keir.
- 366. 330 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS The list of permissions starts with a d, so you can tell that this is actually a directory. After this, you see that the owner of the directory, root, has permission to read, write, and access the directory. Next are the permissions for the group: three dashes. In other words, members of the group called root have no permission to access this directory in any way. They cannot browse it, create new files in it, or even access it. Following this are the permissions for the rest of the users. This includes you, because you’re not the user root and don’t belong to its group. The three dashes means you don’t have permission to read, write, or access this directory. In other words, it’s out of bounds to you, probably because it contains files that only the root user should access! SWITCHING USERS If you have more than one user set up on your system, it’s possible to switch users on the fly while you’re working at the shell. On our test PC, we have an additional user account called frank. While logged in as any user, we can temporarily switch to this user by typing the following command, which stands for substitute user: su frank We’ll then be asked for user frank’s password. Once this is typed, we will effectively have logged in as user frank. Any files we create will be saved with frank’s ownership. If you created a root account (by using the command sudo passwd root), you can temporarily switch into it by typing just su, without any username afterward. To return to your own account from any other account, type exit. Altering Permissions You can easily change permissions of files and directories by using the chmod command. For example, if you want to change a file so that everyone on the system can read and write to it, type the following: chmod a+rw myfile In other words, you’re adding read and write (rw) permissions for all users (a), including the owner, the group, and everybody else. Here’s another example: chmod a-w myfile This tells Linux that you want to take away (-) the ability of all users (a) to write (w) to the file. However, you want to leave the other permissions as they are.
- 367. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 331 ■Tip If you leave out the a, chmod assumes you mean “all”. In other words, commands like chmod a+r myfile and chmod +r myfile do the same thing. If you specify u, you can change permissions just for the owner (u is for “user”, which is the same as “owner”): chmod u+rw This will add (+) read/write (rw) permissions for the owner. As you might already have guessed, you can substitute a g to change group permis- sions: chmod g-rw This will configure the file so that members of the group that owns the file can’t read or write to it. Using an o, which is for “others”, will configure the file permissions for those who aren’t the owner of the file or who are not in the group that owns the file—the last three digits of the permission list. A typical day-to-day use of chmod is in making a program file that you’ve downloaded executable. Because of the way the Internet works, if you download a program to install on your computer, it can lose its executable status while in transit. In this case, issue the following command: chmod u+x myprogram This will configure the file so that the owner (u) can execute (x) it. Changing the Ownership of a File To change the owner of a file, use the chown command. For security reasons, this must be prefaced with the sudo command, which is to say that chown and chgrp (to change the group ownership) require superuser powers. For example, to set the owner of myfile as frank, type this command: sudo chown frank myfile You can also change the owner and the group of a file using chown. Simply type each separated by a period: sudo chown frank.mygroup myfile This will change myfile so that its owner is frank and its group is mygroup. To change just the group of a file, you can use the chgrp command in exactly the same way as chown: sudo chgrp mygroup myfile
- 368. 332 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS CREATING FILE SHORTCUTS We touched upon the idea of file system shortcuts in Chapter 12, when we discussed creating launchers on the GNOME desktop. The problem with launchers is that they are only recognized within GNOME. In other words, they mean nothing when you’re using the command prompt (or virtually every other program that loads/saves files, with the exception of some programs created specially for the GNOME desktop environment). The Ubuntu file system offers two types of genuine shortcuts, which it refers to as file links. They are symbolic links and hard links. Both are created using the ln command. Symbolic links are the most commonly used. A symbolic link is the most similar to a Windows shortcut in that a small file is created that “points toward” another file. Unlike a Windows shortcut, the symbolic link file exists at the file system level, so it can’t be viewed in a text editor, for example. You can spot a symbolic link in a file listing, because it will be followed by an arrow and then the name and path (if necessary) of the file it links to. For example, in your /home directory, the directory Examples is symbolically linked to /usr/share/example-content. When you type ls -l, it appears as follows: Examples -> /usr/share/example-content A hard link is more complex and needs some understanding of how files work. In simple terms, all files consist of a pointer and actual data. As you might expect, the pointer tells the file system where on the disk to find the data. Creating a hard link effectively creates an additional pointer to the data that has exactly the same attributes as the original pointer, except with a different name. Performing any opera- tion on the linked file will perform that operation on the original file. Additionally, there will be no obvious sign the hard link isn’t actually a genuine file, apart from the fact that the link count—the number after the file permissions—will be more than 1. This indicates that more than one file links to the data. Maybe now you can see why people prefer to use the more obviously detectable symbolic links! To create a symbolic link, the -s command option is used with the ln command. First, specify the original file and then the new link’s name. Here’s an example, followed immediately by the output of the ls -l command, which shows the results: ln -s original_file link ls -l lrwxrwxrwx 1 keir keir 13 2006-11-22 12:05 link -> original_file -rw-r--r-- 1 keir keir 0 2006-11-21 15:30 original_file The new link has odd file permissions. It claims to have read/write/execute permissions for every- body (rwxrwxrwx) but actually, because it’s a link, it mirrors the permissions of the file it links to. So if you attempt to access a shortcut that links to a file you don’t have permission to access, you’ll see the appropriate error message. To create a hard link, simply use ln on its own: ln original_file link
- 369. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 333 As mentioned, apart from the link count, there will be no obvious sign the new link is, in fact, a link: -rw-r--r-- 2 keir keir 0 2006-11-21 15:30 original_file -rw-r--r-- 2 keir keir 0 2006-11-21 15:30 link The hard link adopts all the properties of the file, including its permissions and date/time of creation. It even has the same link count! The File System Explained Now that you understand the principles of files and users, we can take a bird’s-eye view of the Linux file system and start to make sense of it. You might already have ventured beyond the /home directory and wandered through the file system. You no doubt found it thoroughly confusing, largely because it’s not like anything you’re used to. The good news is that it’s not actually very hard to understand. If nothing else, you should be aware that nearly everything can be ignored during everyday use. ■Note The Ubuntu file system is referred to as a hierarchical file system. This means that it consists of a lot of directories that contain files. Windows also uses a hierarchical file system. Ubuntu refers to the very bottom level of the file system as the root. This has no connection with the root user. You can switch to the root of the file system by typing the following shell command: cd / When used on its own, the forward slash is interpreted as a shortcut for root. If we do this on our PC and then ask for a long file listing (ls -l), we see the following: total 108 drwxr-xr-x 2 root root 4096 2006-11-14 04:29 bin drwxr-xr-x 3 root root 4096 2006-11-14 04:27 boot lrwxrwxrwx 1 root root 11 2006-11-14 04:20 cdrom -> media/cdrom drwxr-xr-x 12 root root 13500 2006-11-22 05:44 dev drwxr-xr-x 102 root root 4096 2006-11-22 11:35 etc drwxr-xr-x 3 root root 4096 2006-11-14 04:26 home drwxr-xr-x 2 root root 4096 2006-10-25 09:26 initrd lrwxrwxrwx 1 root root 33 2006-11-14 04:27 initrd.img -> boot/ ➥
- 370. 334 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS initrd.img-2.6.17-10-generic drwxr-xr-x 17 root root 4096 2006-11-14 04:29 lib drwxr-xr-x 2 root root 49152 2006-11-14 04:20 lost+found drwxr-xr-x 5 root root 4096 2006-10-25 09:26 media drwxr-xr-x 2 root root 4096 2006-10-19 18:49 mnt drwxr-xr-x 2 root root 4096 2006-10-25 09:26 opt dr-xr-xr-x 94 root root 0 2006-11-22 00:43 proc drwxr-xr-x 7 root root 4096 2006-11-22 11:14 root drwxr-xr-x 2 root root 4096 2006-11-14 04:28 sbin drwxr-xr-x 2 root root 4096 2006-10-25 09:26 srv drwxr-xr-x 11 root root 0 2006-11-22 00:43 sys drwxrwxrwt 12 root root 4096 2006-11-22 11:00 tmp drwxr-xr-x 11 root root 4096 2006-10-25 09:26 usr drwxr-xr-x 15 root root 4096 2006-10-25 09:39 var lrwxrwxrwx 1 root root 30 2006-11-14 04:27 vmlinuz -> boot/ ➥ vmlinuz-2.6.17-10-generic The first thing you’ll notice from this is that the root of the file system contains largely directories and that all files and directories are owned by root. Only users with administrative powers can write files to the root of the file system. That means if you wanted to write to the root of the file system or otherwise access those files, you would need to use the sudo command. This is to prevent damage, since most of the directories in the root of the file system are vital to the correct running of Linux and contain essential programs or data. ■Caution It’s incredibly easy to slip up when using the command-line shell and thereby cause a lot of damage. For example, simply mistyping a forward slash in a command can mean the difference between deleting the files in a directory and deleting the directory itself. This is just another reason why you should always be careful when working at the command line, especially if you use the sudo command. As you can see from the file permissions of each directory in the root of the file system, most directories allow all users to browse them and access the files within (the last three characters of the permissions read r-x). You just won’t be able to write new files there or delete the directories themselves. You might be able to modify or execute programs contained within the directory, but this will depend on the permissions of each individual file. Table 14-3 provides a brief description of what each directory and file in the Ubuntu root file system contains. This is for reference only; there’s no need for you to learn this
- 371. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 335 information. The Ubuntu file system broadly follows the principles in the Filesystem Hierarchy Standard, as do most versions of Linux, but it does have its own subtleties. Table 14-3. Directories and Files in the Ubuntu Root File System Directory Contents bin Vital tools necessary to get the system running or for use when repairing the system and diagnosing problems boot Boot loader programs and configuration files (the boot loader is the menu that appears when you first boot Linux) cdrom -> media/cdrom Symbolic link (shortcut) to the entry for the CD- or DVD-ROM drive in the /dev folder (accessing this file will let you access the CD- or DVD-ROM drive) dev Virtual files representing hardware installed on your system etc Central repository of configuration files for your system home Where each user’s personal directory is stored initrd Used during booting to mount the initial ramdisk initrd.img -> boot/ Symbolic link to the initial ramdisk, which is used to initrd.img-2.6.17-10-generic boot Linux lib Shared system files used by Linux as well as the software that runs on it lost+found Folder where salvaged scraps of files are saved in the event of a problematic shutdown and subsequent file system check media Where the directories representing various mounted storage systems are made available (including Windows partitions on the disk) mnt Directory in which external file systems can be temporarily mounted opt Software that is theoretically optional and not vital to the running of the system (many software packages you use daily can be found here) proc Virtual directory containing data about your system and its current status root The root user’s personal directory sbin Programs essential to administration of the system srv Configuration files for any network servers you might have running on your system sys Mount point of the sysfs file system, which is used by the kernel to administer your system’s hardware tmp Temporary files stored by the system
- 372. 336 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS Table 14-3. Directories and Files in the Ubuntu Root File System (Continued) Directory Contents usr Programs and data that might be shared with other systems (such as in a large networking setup with many users)1 var Used by the system to store data that is constantly updated, such as printer spooling output vmlinuz -> boot/ Symbolic link to the kernel file used during bootup vmlinuz-2.6.17-10-generic 1 The usr directory contains its own set of directories that are full of programs and data. Many system programs, such as the X11 GUI software, are located within the /usr directory. Note that the /usr directory is used even if your system will never act as a server to other systems. TYPES OF FILE SYSTEMS Linux is all about choice, and this extends to the technology that makes the file system work. Unlike with Windows, where the only choice is NTFS, Linux offers many different types of file system technology. Each is designed for varying tasks. Most are scalable, however, which means that they will work just as happily on a desktop PC as on a massive cluster of computers. Ubuntu uses the ext3 file system. This is a popular choice among distros, and nearly all home- or office-oriented distros use it. That said, people are constantly arguing about which file system is best. The principal measuring stick is performance. Your computer spends a lot of time writing and reading files, so the faster a file system is, the faster your PC will be overall (although, in reality, the hardware is of equal importance). Note that what we’re talking about here is the underlying and invisible technology of the file system. In day-to-day use, the end user won’t be aware of any difference between ext3, reiserfs, or another file system technology (although when things go wrong, different tools are used to attempt repairs; their selection is automated within Ubuntu). Here are the various types along with notes about what they offer: • ext2: Fast, stable, and well established, ext2 was once the most popular type of file system tech- nology used on Linux. It has now been eclipsed by ext3. • ext3: An extension of ext2, ext3 allows journaling, a way of recording what has been written to disk so that a recovery can be attempted when things go wrong. • reiserfs: This is another journaling file system, which claims to be faster than others and also offers better security features. • jfs: This is a journaling file system created by IBM. It’s used on industrial implementations of Unix. • xfs: This is a 64-bit journaling file system created by Silicon Graphics, Inc. (SGI) and used on its own version of Unix, as well as Linux.
- 373. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 337 Mounting Described in technical terms, mounting is the practice of making a file system available under Linux. Whereas Windows uses drive letters to make other file systems available within Windows Explorer, Linux integrates the new file system within the root file system, usually by making the contents appear whenever a particular directory is accessed. The mounted file system can be a partition on your hard disk, a CD-ROM, a network server, or many other things. Mounting drives might seem a strange concept, but it actually makes everything much simpler than it might be otherwise. For example, once a drive is mounted, you don’t need to use any special commands or software to access its contents. You can use the same programs and tools that you use to access all of your other files. Mounting creates a level playing field on which everything is equal and can therefore be accessed quickly and efficiently. Using the mount Command At the command line, mounting is done via the mount command. Under Ubuntu, you must have administrator powers to use the mount command, which means prefacing it with sudo and providing your password when prompted. With most modern versions of Linux, mount can be used in two ways: by specifying all the settings immediately after the command or by making reference to an entry within the fstab file. fstab stands for File System Table, and that gives an indication of what it’s used for—it’s a look-up file stored in the /etc directory that contains details of all file systems on the PC that are regularly mounted. Figure 14-3 shows an example of a typical fstab file. ■Note The root file system is itself mounted automatically during bootup, shortly after the kernel has started and has all your hardware up and running. If you look within /etc/fstab, you’ll see that it too has its own entry, as does the swap partition. Every file system that Linux uses must be mounted at some point. Let’s say that you insert a CD or DVD into your computer’s DVD-ROM drive. To mount the CD or DVD and make it available to Linux (something that is actually done automati- cally as soon as you put a disk in the drive, so this example is for demonstration purposes only), you would type the following: sudo mount /media/cdrom The mount command first looks in your fstab file to find what you’re referring to. It then matches up the directory you’ve specified as the mount point against the hardware details,
- 374. 338 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS in the form of a UUID number, which is then translated by Ubuntu into a file within the /dev directory. The two are then magically connected together. Note that the contents of the mounted file system are made available in a virtual way. The files are not literally copied into the directory. The directory is merely a conduit that allows you to read the CD’s contents. There aren’t any special commands used to work with drives that have been mounted. The shell commands discussed in Chapter 13 should do everything you need, and Nautilus will have no trouble browsing its contents. The mount command doesn’t see widespread usage by most users nowadays, because most removable storage devices like CDs, and even memory card readers, are mounted automatically under Ubuntu, and an icon for them appears on the desktop. However, there may be occasions when you need to mount a drive manually. Figure 14-3. Details of all frequently mounted file systems are held in the /etc/fstab file. Mounting a Drive Manually Let’s look at an example of when you might need to mount a drive manually. Suppose that you’ve just added a second hard disk to your PC that has previously been used on a Windows system, and you want to salvage some data before formatting the disk. Let’s also assume the new disk has been added as the slave on the primary IDE channel, which is the usual method of adding a second disk to an IDE-based computer.
- 375. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 339 ■Tip To learn more about installing hard disks, see www.computerhope.com/issues/ch000413.htm. Here are the steps you would typically follow: 1. The first thing to do is create a mount point, which is a directory that will act as a location where you can tell mount to make the disk accessible. ■Note The mount point doesn’t necessarily have to be empty or new! You can use any directory as a mount point, and as long as the file system is mounted, the original contents of the directory will be invisible. However, to avoid confusion, it’s best to create a new independent mount point. You can create the new directory anywhere, but under Ubuntu, the convention is to create it in the /media directory. Therefore, the following command should do the trick (note that you need to use the sudo command, because writing to any directory other than your /home directory requires administrator privileges): sudo mkdir /media/newdisk 2. You now need to know what kind of partition type is used on the disk, because you need to specify this when mounting. To find this out, use the fdisk command. Type the following exactly as it appears: sudo fdisk -l /dev/hdb 3. This will list the partitions on the second disk drive (assuming an average PC system). With most hard disks used under Windows, you should find a single partition that will be either NTFS or FAT32. The examples here assume that this is hdb1. ■Caution Be aware that fdisk is a dangerous system command that can damage your system. The program is designed to partition disks and can wipe out your data if you’re not careful! 4. With this information in hand, you’re now ready to mount the disk. For a FAT32 disk, type the following: sudo mount -t vfat –o umask=000 /dev/hdb1 /media/newdisk
- 376. 340 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS For an NTFS disk, type the following: sudo mount -t ntfs -o umask=0222 /dev/hdb1 /media/newdisk The -t command option is used to specify the file system type. The -o flag indicates that you’re going to specify some more command options, and you do so in the form of umask, which tells mount to ensure that the directory is readable (and writable in the case of the FAT32 drive). After this, you specify the relevant file in the /dev directory (this file is only virtual, of course, and merely represents the hardware), and then specify the directory that is acting as your mount point. ■Note Although the fstab file refers to UUID numbers, for a temporary mount, it’s fine to refer specifically to the hardware within the /dev directory. Now when you browse to the /mnt/newdisk directory by typing cd /mnt/newdisk, you should find the contents of the hard disk accessible. You should also have found that a new icon appeared on the desktop for the file system which you can double-click to access the new disk via Nautilus. For more information about the mount command, read its man page (type man mount). Removing a Mounted System To unmount a system, you use the special command umount (notice there’s no n after the first u). Here’s an example of using the command to unmount the hard disk we mounted previously: sudo umount /media/newdisk All you need to do is tell the umount command the mount point. Alternatively, you can specify the file in the /dev directory that refers to mounted resource, but this is a little complicated, so in most cases, it’s better to simply specify the file system location of the mount. If you’re currently browsing the mounted directory, you’ll need to leave it before you can unmount it. The same is true of all kinds of access to the mounted directory. If you’re browsing the mounted drive with Nautilus or if a piece of software is accessing it, you won’t be able to unmount it until you’ve quit the program and closed the Nautilus window (or browsed to a different part of the file system).
- 377. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 341 USEFUL BASIC SHELL COMMANDS Here are some additional shell commands that you might find useful on a day-to-day basis. Don’t forget you can view the man pages of these commands to learn more. Note that commands for manipulating text files are dealt with in the next chapter. • clear: Clear the terminal window, and put the cursor at the top of the window. • date: Display current date and time. • dmesg: Show the output of the kernel, including error messages (useful for problem solving). • eject: Eject a CD/DVD. • exit: Log out of current user account being accessed at the command line (if issued in a terminal window, the window will close). • file: Display useful information about the specified file; the filename should be stated immedi- ately afterward (that is, file myfile.txt). • free: Display information about memory usage; add -m command option to see output in megabytes. • halt: Shut down the computer (needs to be run as root, so prefeace with sudo). • help: Show a list of commonly used BASH commands. • last: Show recent system logins. • pwd: Print Working Directory; this will simply tell you the full path of where you’re currently browsing. • reboot: Reboot the computer (needs to be run as root, so preface with sudo). • shred: Destroy the specified file beyond recovery by overwriting with junk data; the filename should be specified immediately afterward. • touch: Give the specified file’s current date and time; if the specified file doesn’t exist, then create an empty file. The filename should be specified immediately afterward. • uptime: Display how long the computer has been booted, plus various CPU usage statistics. • whatis: Display a one-line summary of the specified command; the command name should follow immediately afterward.
- 378. 342 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS File Searches Files frequently get lost. Well, technically speaking, they don’t actually get lost. We just forget where we’ve put them. But because of this, the shell includes some handy commands to search for files. Using the find Command The find command manually searches through all the files on the hard disk. It’s not a particularly fast way of finding a file, but it is reliable. Here’s an example: find /home/keir -name "myfile" This will search for myfile using /home/keir as a starting point (which is to say that it will search all directories within /home/keir, any directories within those directories, and so on, because it’s recursive). To search the entire file system, type / as the path. Remember that / is interpreted by BASH as the root of the file sytem. If the file is found, you’ll see it appear in the output of the command. The full path will be shown next to the filename. If you give find a try, you’ll see that it’s not a particularly good way of searching. Apart from being slow, it will also return a lot of error messages about directories it cannot search. This is because, when you run the find command, it takes on your user permissions. Whenever find comes across a directory it cannot access, it will report it to you, as shown in the example in Figure 14-4. There are frequently so many of these warnings that the output can hide the instances where find actually locates the file in question! You can avoid these error messages in various ways, but perhaps the quickest solution is to preface the find command with sudo to invoke superuser powers. In this way, you’ll have access to every file on the hard disk, so the find command will be unrestricted in where it can search and won’t run into any directories it doesn’t have permission to enter. ■Caution Using the sudo command with find may represent an invasion of privacy if you have more than one user on your system. The find command will search other users’ /home directories and report any instances of files found there, too. However, an even better solution for finding files is to use the locate command.
- 379. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 343 Figure 14-4. The find command is useful for finding files but isn’t problem-free. Using the locate Command The alternative to using find is to use the locate command. This is far quicker than find, because it relies on a central database of files, which is periodically updated. In other words, it doesn’t literally search the file system each time. The problem is that if you’ve saved a file recently and are hoping to find it, there’s a chance that it won’t yet appear in locate’s database, so it won’t turn up in the list of results. Using locate is easy. You can use the following command to search for a file (you don’t need to precede the command with sudo): locate myfile It’s possible to update the locate database manually, although this might take a few minutes to work through. Simply issue the command: sudo updatedb After this, all files in the system should be indexed, making your search results more accurate.
- 380. 344 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS Using the whereis Command One other command worth mentioning in the context of searching is whereis. This locates where programs are stored and is an excellent way of exploring your system. Using it is simply a matter of typing something like this: whereis cp This will tell you where the cp program is located on your hard disk. It will also tell you were its source code and man page are located (if applicable). However, the first path returned by the search will be the location of the program itself. File Size and Free Space Often, it’s necessary to know how large files are and to know how much space they’re taking up on the hard disk. In addition, it’s often handy to know how much free space is left on a disk. Viewing File Sizes Using the ls -l command option will tell you how large each file is in terms of bytes. Adding the -h option converts these file sizes to kilobytes, megabytes, and even gigabytes, depending on how large they are. In order to get an idea of which are the largest files and which are the smallest, you can add the -S command option. This will order the files in the list in terms of the largest and smallest files. The following will return a list of all the files in the current directory, in order of size (largest first), detailing the sizes in kilobytes, megabytes, or gigabytes: ls -Slh There’s another, more powerful way of presenting this information: using the du command, which stands for “disk usage.” When used on its own without command switches, du simply presents the size of directories alongside their names (starting in the current directory). It will show any hidden directories (directories whose names start with a period) and will also present a total at the end of the list. This will probably be quite a long list. Once again, you can add the -h command option to force the du command to produce human-readable measurements of kilobytes and megabytes. If you specify a file or directory when using the du command, along with the -s command option, you can find out its total file size: du -sh mydirectory
- 381. CHAPTER 14 ■ UN DERS TANDING LINUX FILES AN D US ERS 345 This will show the size taken up on the disk by mydirectory, adding to the total any files and/or subdirectories it contains. However, du is limited by the same file permission problems as the find tool, as shown in Figure 14-5. If you run du as an ordinary user, it won’t be able to calculate the total for any directories you don’t have permission to access. Therefore, you might consider prefacing the command with sudo. Figure 14-5. The du command shows the size of a file, and the df command can be used to gauge the amount of free space on the disk. Finding Out the Amount of Free Space What if you want to find out how much free space is left on the disk? In this case, you can use the df command. This command is also demonstrated in Figure 14-5. The df command reports the free space in all mounted file systems, as well as just the root file system. This can lead to confusing results, because you’ll also see results for the /var directory, for example, or /dev. You’ll see results for your Windows file system too! To make sense of it all, look under the Mounted On heading for /, which always indi- cates the root file system. If you have a memory card inserted and want to find out its free space, look under this list for its mount point (which will probably be in /media). Once again, you can add the -h option to the df command to have the file sizes returned in megabytes and gigabytes (and even terabytes if your hard disk is big enough!).
- 382. 346 CHAPTER 14 ■ UNDERS TA NDIN G LINUX FILES AN D US ERS ■Note There is as much space free in any directory as there is space on the disk, which is why df displays data about the entire partition. If you’re using a system managed by a system administrator within a business environment, you might find that quotas have been used to limit how much disk space you can take up. However, if you’re using a desktop PC and are the only user, this won’t be activated. Summary In this chapter, we examined how the Ubuntu file system lies at the heart of an under- standing of how the operating system works. We also discussed how the file system and user accounts go hand-in-hand and are inextricably linked. This involved discussing the concept of file ownership and usage permissions, plus how these can be manipulated using command-line shell tools. We also discussed the overall structure of the Ubuntu file system and how external file systems can be mounted and made available within Ubuntu. Finally, we looked at how to find files and how to gauge how much free space there is within the file system. In the next chapter, we’ll look at how the BASH shell can be used to view and otherwise manipulate text files, which are also important to the way Ubuntu works.
- 383. CHAPTER 15 ■■■ Working with Text Files W indows views text files as just another file type, but to Ubuntu, they can be essential components that make the system work. Configuration files are stored as plain text, and program documentation is also stored as text. This is clearly different from Windows, where it’s very likely any information you’re supposed to read will be contained in a Windows Help file, a rich text format (RTF) file, or even a Microsoft Word document. Because of the reliance on text files, the shell includes several commands that let you display, edit, and otherwise manipulate text files in various ways. Learning to use the shell, and therefore learning how to administer your Ubuntu system, involves having a good understanding of these text tools. You’ll use text tools for editing configuration files and viewing log files, as just two examples. Viewing Text Files You can easily view files using command-line tools, including cat, less, head, and tail. The simplest command for dealing with text files is cat. Using the cat Command When followed with a filename, the cat command will display the text file on screen: cat mytextfile cat is short for concatenate, and it isn’t designed just to display text files. That it can do so is simply a side effect of its real purpose in life, which is to join two or more files together. However, when used with a single file, it simply displays its contents on screen. If you try to use cat, you’ll realize that it’s good for only short text files; large files scroll off the screen. 347
- 384. 348 CHAPTER 15 ■ WORKING WITH TEXT FILES Using the less Command Because cat works well only with short files, and to give you more control when viewing text files, the less and more commands were created. The more command came first but was considered too primitive, so someone came up with less, which is preferred by many Linux users. However, both are usually available on the average Linux installation. ■Note The less and more commands are sometimes known as pagers because of their ability to let you scroll through pages of text. You might still hear them referred to as such in the wider Linux community, although the term has fallen out of use. Let’s look at using less to read the Eye of Gnome README file, which contains informa- tion about the current release of the default Ubuntu image viewer. The file is located at /usr/share/doc/eog/README, so to use less to read it, type the following: less /usr/share/doc/eog/README You can scroll up and down within the less display by using the cursor keys. If you want to scroll by bigger amounts of text, you can use the Page Up and Page Down keys. Alternatively, you can use the spacebar and B key, both of which are commonly used by old-hand Linux users for the same function. In addition, the Home and End keys will take you to the start and end of the document, respectively. A useful command option to use with less is -M, which adds a short status bar to the bottom left. Alongside the filename, you’ll see how many lines the document has and which line you’re currently up to. In addition, you’ll see, as a percentage, the amount of document you’ve already read through, so you’ll know how much is left. less lets you search forward through the file by typing a slash (/) and then entering your search term. Any words that are matched will be highlighted on screen. To repeat the search, type n. To search backward in a file from your current point, type a question mark (?). To quit less, simply type q. Although it’s supposedly a simple program, less is packed with features. You can see what options are available by reading its man page or by typing less --help. Using the head and tail Commands A couple of other handy commands that you can use to view text files are head and tail. As their names suggest, these let you quickly view the beginning (head) of a file or the end (tail) of it.
- 385. C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 349 Using the commands is simple: tail mytextfile or head mytextfile By default, both commands will display ten lines of the file. You can override this by using the -n command option followed by the number of lines you want to see. For example, the following will show the last five lines of mytextfile: tail -n5 mytextfile These two commands are very useful when viewing log files that might contain hundreds of lines of text. The most recent information is always at the end, so tail can be used to see what’s happened last on your system, as shown in the example in Figure 15-1. Although they’re powerful, all of these shell commands don’t let you do much more than view text files. If you want to edit files, you’ll need to use a text editor such as vim. Figure 15-1. The tail command can be very useful for viewing the last few lines of a log file.
- 386. 350 CHAPTER 15 ■ WORKING WITH TEXT FILES STANDARD INPUT AND OUTPUT If you’ve read any of the Ubuntu man pages, you might have seen references to standard input and standard output. Like many things in Linux, this sounds complicated but is merely a long-winded way of referring to something that is relatively simple. Standard input is simply the device that programs running under Ubuntu normally take input from. In other words, on the majority of desktop PCs when you’re using the command-line shell, standard input refers to the keyboard. However, it’s important to note that it could also feasibly refer to the mouse or any other device on your system capable of providing input; even some software can take the role of providing standard input. Standard output is similar. It refers to the device to which output from a command is usually sent from software. In the majority of cases at the command line, this refers to the monitor screen, although it could feasibly be any kind of output device, such as your PC’s sound card and speakers. The man page for the cat command says that it will “concatenate files and print on the standard output.” In other words, for the majority of desktop Ubuntu installations, it will combine (concatenate) any number of files together and print the results on screen. If you specify just one file, it will display that single file on your screen. In addition to hardware devices, input can also come from a file containing commands, and output can also be sent to a file instead of the screen, or even sent directly to another command. This is just one reason why the command-line shell is so flexible and powerful. Using a Command-Line Text Editor A variety of text editors can be used within the shell, but three stand out as being ubiquitous: ed, vim, and Emacs. The first in that list, ed, is by far the simplest. That doesn’t necessarily mean that it’s simple to use or lacks powerful features, but it just doesn’t match the aston- ishing power of both vim and Emacs. To call vim and Emacs simple text editors is to do them a disservice, because both are extremely powerful interactive environments. In particular, Emacs is considered practically an operating system in itself, and some users of Linux treat it as their shell, executing commands and performing everyday tasks, such as reading and sending e-mail from within it. There are entire books written solely about Emacs and vim. ■Tip A fourth shell-based text editor found on many Linux systems is nano. This offers many word processor–like features that can be helpful if you’ve come to Linux from a Windows background.
- 387. C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 351 The downside of all the power within Emacs and vim is that both packages can be diffi- cult to learn to use. They’re considered idiosyncratic by even their most ardent fans. Both involve the user learning certain unfamiliar concepts, as well as keyboard shortcuts and commands. Although there are debates about which text editor is better and which is best, it’s generally agreed that vim offers substantial text-editing power but isn’t too all-encompassing. It’s also installed by default on Ubuntu. On Ubuntu, Emacs must be installed as an optional extra. Both text editors are normally available on virtually every installation of Linux or Unix. We’ll concentrate on using vim here. It’s important to understand that vim is an update of a classic piece of software called vi. In fact, there are many versions and updates of vi. The original program, once supplied with Unix, is rarely used nowadays. vim is the most commonly used clone; vim stands for vi improved. Other versions include elvis (http://elvis.the-little-red-haired-girl.org/). However, most people still refer to vim and elvis as vi, despite the fact they are entirely new pieces of software. ■Note There’s always been a constant flame war between advocates of vi and Emacs, as to which is better. This could be quite a vicious and desperate debate, and the text editor you used was often taken as a measure of your character! Nowadays, the battle between the two camps has softened, and the Emacs versus vi debate is considered an entertaining cliché of Linux and Unix use. Declaring online which text editor a user prefers is often followed by a smiley symbol to acknowledge the once-fevered emotions. Understanding vim Modes The key to understanding how vim works is to learn the difference between the various modes. Three modes are important: Command mode, Insert mode, and Command-Line mode. Command Mode Command mode is vim’s central mode. When the editor starts up, it’s in Command mode, as shown in Figure 15-2. This lets you move around the text and delete words or lines of text. vim returns to Command mode after most operations. In this mode, the status bar at the bottom of the screen shows information such as the percentage progress through the document. Although you cannot insert text in this mode, you can delete and otherwise manipulate words and lines within the file. You can also move through the text using the cursor keys and the Page Up and Page Down keys.
- 388. 352 CHAPTER 15 ■ WORKING WITH TEXT FILES Figure 15-2. In vim, the main mode is Command mode. Table 15-1 shows a list of the commands you can use in Command mode (consider photocopying it and sticking it to the side of your monitor as a handy reference). Table 15-1. vim Command Mode Commands Command Description Delete Text dd Delete current line ndd Delete n number of lines (for example, 5dd will delete five lines)1 dw Delete the current word under the cursor 2 db Delete the word before the cursor2 D Delete everything from the cursor to the end of the line1 Search / Search forward (type the search text directly after the slash) ? Search backward n Repeat search in a forward direction N Repeat search in a backward direction
- 389. C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 353 Table 15-1. vim Command Mode Commands Command Description Cut and Paste yy Copy the current line3 nyy Copy n number of lines into the buffer from the cursor downwards (for example, 5yy copies five lines of text) p Paste the contents of the clipboard3 Insert Text i Switch to Insert mode at the cursor o Switch to Insert mode, placing the cursor below current line O Switch to Insert mode, placing the cursor above current line A Append text to end of line Navigation4 $ Move the cursor to the end of the current line w Move the cursor to the next word b Move the cursor to beginning of the current or previous word Miscellaneous . Repeat the last command u Undo the last command 1 A line ends where a line-break control character occurs in the file. Because of this, a line of text may actually take up several lines of the on-screen display. 2 This will delete the remainder of current word before/after the cursor if the cursor is in the middle of a word. 3 The standard documentation refers to copying as "yanking” and the clipboard as the “buffer.” 4 You can also use the cursor keys to move around the file and the Page Up and Page Down keys to move up and down a page at a time. Additionally, press 0 (zero) on the main keyboard, not the numeric keypad, to move the cursor to the start of the current line, or Shift+0 to move forward one sentence (until the next full stop). Insert Mode To type your own text or edit text, you need to switch to Insert mode. This is normally done by typing i, but you can also type O or o to change to Insert mode, which is indicated by the word INSERT appearing at the bottom of the screen, as shown in Figure 15-3. The difference between the commands required to switch into Insert mode is that some let you insert before or after the cursor. Generally, i is most useful, because what you type will appear before the character under the cursor, as with most word processors. The commands that activate Insert Mode are listed in Table 15-1, under “Insert Text.”
- 390. 354 CHAPTER 15 ■ WORKING WITH TEXT FILES ■Tip By typing A (Shift+A), you can add text to the end of the line on which the cursor currently resides. Figure 15-3. Use vim’s Insert mode to add and edit text. In Insert mode, you can still move around the text using the cursor keys. Anything you type will appear the point of the cursor. To quit this mode, press the Esc key. This will return you to Command mode. Command-Line Mode The third mode you should be aware of is Command-Line mode (note that, irritatingly, this is not the same as the Command mode). As its name suggests, this is the mode in which you can enter commands to save and load files, as well as perform other funda- mental tasks to control vim or to quit the program. You can enter Command-Line mode by typing a colon (:), although if you’re in Insert mode, you’ll first need to leave it by pressing the Esc key. You can identify when vim is in this mode, because the cursor will be at the bottom of the screen next to a colon symbol, as shown in Figure 15-4. To quit Command-Line mode, press the Esc key. You’ll be returned to Command mode. Note that you’ll automat- ically leave Command-Line mode after each command you issue has completed.
- 391. C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 355 Figure 15-4. Use vim’s Command-Line mode to issue commands. For a list of basic Command-Line mode commands, see Table 15-2. Table 15-2. Some vim Command-Line Mode Commands Command Description :w Save the file :w! Save the file and ignore errors such as an existing file with the same filename :q Quit vim :q! Quit vim and ignore errors such as an unsaved file :s/word/replacement/ Search from the cursor downwards and replace any instances of the word with the replacement 1 :help View help documentation 1 The search tool is very powerful and uses a number of command options for additional flexibility. Read the vim help file to learn more. Using vim to Edit a File As an example, let’s use vim to edit the Nautilus README file. You don’t want to actually alter this file, so start by making a copy of it in your /home directory: cp /usr/share/doc/nautilus/README ~ This will copy the file README to your /home directory, which you indicate using the ~ symbol. Then fire up vim with the file, like this: vim README
- 392. 356 CHAPTER 15 ■ WORKING WITH TEXT FILES ■Note Windows makes a lot of use of file extensions in order to recognize files and therefore know what program to use to run them. By default, a file with a .doc extension tells Windows that it should use Microsoft Word to open the file, for example. Linux uses a different system based on the first few bytes of each file. Because of this, file extensions are used within Linux simply to let the users know what type of file they’re dealing with. Often, they’re not used at all. If a file is called README, you can be fairly certain that it’s a text file, for example. Once the file is opened, you’ll find yourself automatically in Command mode and will be able to move around the file using the cursor keys. Altering the text is achieved using various commands (see Table 15-1). For example, typing dd will delete the line of text that the cursor is currently within. Typing x will delete the letter under the cursor. Typing dw will delete the current word under the cursor. Try some of these to see how they work. To actually edit a file and type text, you’ll need to switch to Insert mode. Type i to do this. Insert mode is fairly easy to understand. You can move around the text using the cursor keys, and then simply start typing wherever you want. The Backspace key will delete text behind the cursor, and the Delete key will delete text in front of the cursor. When you’re finished, press the Esc key to return to Command mode. Once back in Command mode, you can page through the text. The Page Up and Page Down keys will move a screenful of text at a time. Pressing the up and down cursor keys will cause the screen to scroll when the cursor reaches the top or bottom. After you’re finished editing, you’ll need to save the file. This is done in Command-Line mode. You can enter this mode by typing a colon (:). You’ll see a colon appear at the bottom of the screen, and this is where you type the commands. Note that after you type a command, you’ll immediately exit Command-Line mode, so if you want to issue another command, you’ll need to type a colon again. To save a file, in Command-Line mode, type :w (which stands for “write”). If you want to save the current file with a different name, you’ll need to enter a filename after the w command, like this: :w mytextfile To quit vim, type :q. However, if you’ve edited a file, you won’t be able to quit until the file has been saved. If you want to save the file and then quit, you can type :wq. If you don’t want to save the file, type :q!. The exclamation point tells vim to override any objections it might have. You can also use it with the save command—:w!—to force the overwriting of a file that already exists.
- 393. C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 357 ■Note If you don’t have the correct permissions to write a file, vim might tell you that you can use :w! to override. In this case, it’s wrong. The only way to write to a file for which you don’t have permissions is to change its permissions. Creating a New Text File Using vim Creating and editing a new file with vim is easy. From any command-line shell, simply type this: vim myfile This will start vim and give your new file a name. However, the file won’t be saved until you manually issue the save command (:w) in vim. This means that if your computer crashes before you save, the file will be lost! ■Note vim includes some elementary file-save protection. If, for any reason, vim is not shut down properly, there’s a chance you’ll be able to recover a version of file the next time vim starts. However, as with all such protection in any kind of program, you shouldn’t rely on this. You should use the :w command to save your file periodically. As always with vim, you start out in the default Command mode. To start typing imme- diately, enter Insert mode by typing i. You’ll notice when typing that although the text is wrapped on each line, words are not carried over, and they often break across lines in an ugly way. This is because vim is primarily a text editor, not a word processor. For people who create text files, like programmers, having line breaks shown in this way can be useful. When you’re finished typing a sentence or paragraph, you can press the Enter key as usual to start a new line. You should then be able to move between lines using the up and down cursor keys. You’ll notice an odd thing when you try to do this, however: unlike with a word processor, moving up a line of text that spreads across more than one line on screen will take the cursor to the start of the line, rather than into the middle of it. This again relates to vim’s text editor focus, where such a feature is useful when editing documents such as program configuration files. When you’re finished, press the Esc key to switch to Command mode. Then type a colon to enter Command-Line mode. Type :w to save the file using the filename you gave it earlier. If you started vim without specifying a filename, you’ll need to specify a filename with the save command, such as :w myfile.
- 394. 358 CHAPTER 15 ■ WORKING WITH TEXT FILES USING GEDIT TO EDIT TEXT FILES If all this talk of vim sounds like too much hard work, don’t forget that the GNOME desktop includes an excellent text editor in the form of Gedit. In fact, to describe Gedit as merely a text editor is to do it some- thing of a disservice, because it includes many handy word processor–like features. You can call Gedit and open a file in it from the command-line prompt as follows: gedit <filename> If you need to adopt superuser powers to edit the likes of configuration files, simply preface it with gksu: gksu gedit <filename> You’ll find Gedit fairly straightforward to use. Searching Through Files You can search for particular words or phrases in text files by loading the file into less or vim (see Table 15-1). The maneuverability offered by both programs lets you leap from point to point in the text, and their use is generally user-friendly. However, using vim or less can take precious seconds. There’s a quicker command- line option that will search through a file in double-quick speed: grep. Using grep to Find Text grep stands for Global Regular Expression Print. grep is an extremely powerful tool that can use pattern-based searching techniques to find text in files. Pattern-based searching means that grep offers various options to loosen the search so that more results are returned. The simplest way of using grep is to specify some brief text, followed by the name of the file you want to search. Here’s an example: grep 'hello world' myfile This will search for the phrase hello world within myfile. If it’s found, the entire line that hello world is on will be displayed on screen. If you specify the * wildcard instead of a filename, grep will search every file in the directory for the text. Adding the -r command option will cause grep to search all the files, and also search through any directories that are present: grep –r 'hello world' *
- 395. C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 359 Another handy command option is -i, which tells grep to ignore uppercase and lower- case letters when it’s searching. Figure 15-5 shows an example of using grep. Figure 15-5. grep is a powerful tool that can search for text within files. ■Tip You might never choose to use grep for searching for text within files, but it can prove very handy when used to search through the output of other commands. This is done by “piping” the output from one command to another, as explained in Chapter 17. Using Regular Expressions The true power of grep is achieved by the use of search patterns known as regular expressions, or regexes for short. Put simply, regexes allow you to be vague rather than specific when searching, meaning that grep (and many similar tools that use the system of regexes, such as the find command discussed in Chapter 14) will return more results. For example, you can specify a selection or series of characters (called a string in regex terminology) that might appear in a word or phrase you’re searching for. This can be
- 396. 360 CHAPTER 15 ■ WORKING WITH TEXT FILES useful if you’re looking for a word that might be spelled differently from how you antici- pate, for example. The most basic form of regex is the bracket expansion. This is where additional search terms are enclosed in square brackets within a search string. For example, suppose you want to find a file that refers to several drafts of a document you’ve been working on. The files are called myfile_1draft.doc, myfile_2draft.doc, and so on. To find any document that mentions these files, you could type this: grep 'myfile_[1-9]draft.doc' * The use of square brackets tells grep to fill in details within the search string based on what’s inside the square brackets. In this case, 1-9 means that all the numbers from one to nine should be applied to the search string. It’s as if you’ve told grep to search for myfile_1draft.doc, and then told it to search for myfile_2draft.doc, and so on. Notice that the example has a backslash before the period separating the file extension from the filename. This indicates to grep that it should interpret the period as an element of the string to be searched for, rather than as a wildcard character, which is how grep usually interprets periods. You don’t need to specify a range of characters in this way. You can simply enter what- ever selection of characters you want to substitute into the search string. Here’s an example: grep 'myfile[12345].doc' * This will attempt to find any mention of myfile1.doc, myfile2.doc, myfile3.doc, and so on, in any file within the directory. Here’s another example: grep '[GgNn]ome' * This will let you search for the word Gnome within files but takes into account any possible misspelling of the word by people who forget to use the silent G, and any use of uppercase or lowercase. This is only scratching the surface of what regexes can do. For example, many regexes can be combined together into one long search string, which can provide astonishing accuracy when searching. Table 15-3 contains some simple examples that should give you an idea of the power and flexibility of regexes. Table 15-3. Some Examples of Regular Expressions Search String Description 'document[a-z]' Returns any lines containing the string “document” followed by any single letter from the range a through z. 'document[A-Za-z]' Returns any lines containing the string “document” followed by the letters A through Z or a through z. Note that no comma or other character is needed to separate possibilities within square brackets.
- 397. C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 361 Table 15-3. Some Examples of Regular Expressions Search String Description 'document.' Returns any lines containing the string “document” followed by any other character. The period is used as a wildcard signify- ing any single character. 'document[[:digit:]]' Returns any lines containing the string “document” followed by any number. 'document[[:alpha:]]' Returns any lines containing the string “document” followed by any character. '^document' Returns any lines that have the string “document” at the beginning. The caret symbol (^) tells grep to look only at the beginning of each line. 'document$' Returns any line that has the string “document” at the end of the line. The dollar sign symbol ($) tells grep to look for the string only at the end of lines. 'document[^1-6]' Returns lines that have the string “document” in them but not if it’s followed by the numbers 1 through 6. When used in square brackets, the caret character (^) produces a nonmatching list— a list of results that don’t contain the string. grep is very powerful. It can be complicated to master, but it offers a lot of scope for performing extremely precise searches that ensure you find only what you’re seeking. It’s well worth reading through its man pages. You can also refer to books on the subject, of which there are many. A good example is Regular Expression Recipes: A Problem-Solution Approach, by Nathan A. Good (1-59059-441-X; Apress, 2004). Comparing Text Files If you want to compare the differences between two text files, one way to do this is to use the diff command. This is designed primarily to uncover small changes in otherwise identical documents, such as revisions made by another person. Of course, it can also be used to prove that two files are identical. If you run the files through diff, and it shows no output, it has been unable to spot any differences. diff is ordinarily used like this: diff mytextfile1 mytextfile2 If diff spots any differences between the files, the results are a little more complicated than you might be used to. Any lines that are different within the files will appear on screen. Those lines that are identical won’t be displayed. Lines preceded with a left angle bracket (<) are from the first file, while those with a right angle bracket (>) are from the second file. For a different display, you could type something like this:
- 398. 362 CHAPTER 15 ■ WORKING WITH TEXT FILES diff –y mytextfile1 mytextfile2 This places the two lists side-by-side and highlights lines that are different with a pipe symbol (|). However, it requires a lot more screen space than using diff without the -y option. ■Note When you use the -y command option with diff, it will struggle to fit the output in a standard GNOME Terminal window. If it is maximized on a 1024×768 resolution screen, it should be just large enough to fit the information in, depending on the complexity of the files being compared. By specifying the -a command option, you can make diff process binary files, too. This is a handy way of comparing virtually any kind of files, including program files, to see if they’re identical. If there’s no output from diff, then the two files are identical. If your screen fills with gibberish, then the files are clearly different. Incidentally, if you want to compare three documents, you can use a very similar command: diff3. Check the command’s man page to learn more about how it works. More Text Tools BASH is an incredibly capable tool when it comes to text manipulation, and some of its toolset offers modest word-processing–like functionality. It’s no wonder that some people live their lives working at the BASH prompt and have no need of sophisticated GUI tools! Table 15-4 lists some more text-processing tools that you can use on the command line. Along with the commands are listed any command options needed to make them work in a useful way. Some commands rely on redirection and piping, which are explained in depth in Chapter 17. ■Note Most text-processing tools under BASH were created for programmers, so some options might seem a little odd when you read the man pages. However, all the tools all extremely flexible and offer functions for every kind of user.
- 399. C HA PTER 15 ■ WO RK ING WIT H TEXT FI LES 363 Table 15-4. Useful Text-Processing Commands Function Command Notes Spell-check aspell -c filename Any questionable words within filename are highlighted, and a choice of replacements is offered, rather like a standard word processor’s spell check. Press X if you wish to exit after spell-checking starts. Single word look word Looks up word in the dictionary; if the spell-check word is displayed in output, the word has been found. If not, then the word hasn’t been found. Note that this command returns loose match- es—searching for test, for example, will return every word beginning with test (testing, testimony, testosterone, and so forth). Word count wc –w filename Outputs the number of words in filename. Used without the –w command switch, wc outputs the number of lines, followed by the word count, followed by the number of bytes in the file. Remove fmt filename > newfile Creates newfile, removing breaks at line breaks the end of lines in filename. Double- line breaks between paragraphs aren’t affected. Adding the –u command switch removes instances of double spaces too. Remove uniq filename > newfile Creates newfile from filename but duplicate lines removes duplicate lines. Join two files paste file1 file2 > file3 Creates file3 by joining file1 and file2 side-by-side (effectively creating two columns of text). Each line is separated by a tab. Word wrap fold –sw20 filename > newfile Creates newfile from filename, wrap- ping lines at the specified 20 characters (increase/decrease this value for shorter/longer lines). Note that the –s switch ensures lines don’t break across words, even if this means exceeding the specified character count. Add line nl filename > newfile Creates newfile from filename, numbers adding line numbers to the beginning of each line. Sort list sort file1 > file2 Creates file2 from file1, sorting its contents alphanumerically (technically, it sorts according to ASCII, so some symbols appear above numbers). For obvious reasons, this command works best on lists.
- 400. 364 CHAPTER 15 ■ WORKING WITH TEXT FILES Summary In this chapter, we examined how text files can be manipulated. In many ways, the BASH shell is built around manipulating text, and we explored various tools created with this goal in mind. We started with the commands that can display text files (or part of them). We then looked at how the vim text editor can be used to both edit and create documents. Next, we explored how regexes can be used with the grep command to create sophisticated search strings, which can uncover any text within documents. Finally, you saw how to compare text files. In the next chapter, we’ll look at how you can use various command-line tools to take control of your system.
- 401. CHAPTER 16 ■■■ Taking Control of the System B y now, you should be starting to realize that the shell offers an enormous amount of power when it comes to administering your PC. The BASH shell commands give you quick and efficient control over most aspects of your Linux setup. However, the shell truly excels in one area: controlling the processes on your system. Controlling processes is essential for administration of your system. You can tidy up crashed programs, for example, or even alter the priority of a program so that it runs with a little more consideration for other programs. Unlike with Windows, this degree of control is not considered out of bounds. This is just one more example of how Linux provides complete access to its inner workings and puts you in control. Without further ado, let’s take a look at what can be done. Viewing Processes A process is something that exists entirely behind the scenes. When the user runs a program, one or many processes might be started, but they’re usually invisible unless the user specifically chooses to manipulate them. You might say that programs exist in the world of the user, but processes belong in the world of the system. Processes can be started not only by the user, but also by the system itself to undertake tasks such as system maintenance, or even to provide basic functionality, such as the GUI system. Many processes are started when the computer boots up, and then they sit in the background, waiting until they’re needed (such as programs that send mail). Other processes are designed to work periodically to accomplish certain tasks, such as ensuring system files are up-to-date. You can see what processes are currently running on your computer by running the top program. Running top is simply a matter of typing the command at the shell prompt. As you can see in Figure 16-1, top provides very comprehensive information and can be a bit overwhelming at first sight. However, the main area of interest is the list of processes (which top refers to as tasks). 365
- 402. 366 CHAPTER 16 ■ TAK ING CONTROL OF THE SYS TE M Figure 16-1. The top program gives you an eagle-eye view of the processes running on your system. Here’s an example of a line taken from top on our test PC, shown with the column headings from the process list: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 5499 root 15 0 78052 25m 60m S 2.3 5.0 6:11.72 Xorg A lot of information is presented here, as described in Table 16-1. Table 16-1. The top Program Process Information Column Description PID The first number is the process ID (PID). This is the unique number that the system uses to track the process. The PID comes in handy if you want to kill (terminate) the process (as explained in the next section of this chapter). USER This column lists the owner of the particular process. As with files, all processes must have an owner. A lot of processes will appear to be owned by the root user. Some of them are system processes that need to access the system hardware, which is something only the root user is allowed to do. Other processes are owned by root for protection; root ownership means that ordinary users cannot tamper with these processes.
- 403. CHAPTER 16 ■ TAKING CONTROL OF THE SYS TEM 367 Table 16-1. The top Program Process Information Column Description PR This column shows the priority of the process. This is a dynamic number, showing where the particular process is in the CPU queue at the present time. NI This column shows the “nice” value of the process. This refers to how charitable a process is in its desire for CPU time. A high figure here (up to 19) indicates that the process is willing to be interrupted for the sake of other processes. A negative value means the opposite: the process is more aggressive than others in its desire for CPU time. Some programs need to operate in this way, and this is not necessarily a bad thing. VIRT This column shows the amount of virtual memory used by the process.1 RES This column shows the total amount of physical memory used.1 SHR This column shows the amount of shared memory used. This refers to memory that contains code that is relied on by other processes and programs. S This column shows the current status of the task. Generally, the status will either be sleeping, in which case an S will appear, or running, in which case an R will appear. Most processes will be sleeping, even ones that appear to be active. Don’t worry about this; it just reflects the way the Linux kernel works. A Z in this column indicates a zombie process (a child of a process that has been terminated). %CPU This column shows the CPU use, expressed as a percentage.2 %MEM This column shows the memory use, again expressed as a percentage.2 TIME+ This column shows a measure of how long the process has been up and running. COMMAND This shows the actual name of the process itself. 1 Both VIRT and RES are measured in kilobytes unless an m appears alongside the number; in which case, you should read the figure as megabytes. 2 The %CPU and %MEM entries tell you in easy-to-understand terms how much of the system resources a process is taking up. This list will probably be longer than the screen has space to display, so top orders the list of processes by the amount of CPU time the processes are using. Every few seconds, it updates the list. You can test this quite easily. Let your PC rest for a few seconds, without touching the mouse or typing. Then move the mouse around for a few seconds. You’ll see that the process called Xorg leaps to the top of the list (or appears very near the top). Xorg is the program that provides the graphical subsystem for Linux, and making the mouse cursor appear to move around the screen requires CPU time. When nothing else is going on, moving the mouse causes Xorg to appear as the number one user of CPU time on your system. ■Tip Typing d while top is running lets you alter the update interval, which is the time between screen updates. The default is three seconds, but you can reduce that to one second or even less if you wish. However, a constantly updating top program starts to consume system resources and can therefore skew the diagnostic results you’re investigating. Because of this, a longer, rather than shorter, interval is preferable.
- 404. 368 CHAPTER 16 ■ TAK ING CONTROL OF THE SYS TE M It’s possible to alter the ordering of the process list according to other criteria. For example, you can list the processes by the quantity of memory they’re using, by typing M while top is up and running. You can switch back to CPU ordering by typing P. RENICING A PROCESS You can set how much CPU time a process receives while it’s actually running. This is done by renicing the process. This isn’t something you should do on a regular basis, but it can prove very handy if you start a program that then uses a lot of system resources and makes the system unbearably slow. The first thing to do is to use top to spot the process that needs to be restrained and find out its PID number. This will be listed on the left of the program’s entry on the list. Once you know this, type r, and then type in the PID number. You’ll then be asked to specify a renice value. The scale goes from –20, which is considered the highest priority, to 19, which is considered the lowest. Therefore, you should type 19. After this, you should find some responsiveness has returned to the system, although how much (if any) depends on the nature of the programs you’re running. You might be tempted to bump up the priority of a process to make it run faster, but this may not work because of complexities in the Linux kernel. In fact, it might cause serious problems. Therefore, you should renice with care and only when you must. Renicing can also be carried out via the renice command at the prompt, avoiding the need to use top. Also useful is the nice command, which can be used to set the initial priority of a process before it starts to run. To learn more, see the man pages for renice and nice. Controlling Processes Despite the fact that processes running on your computer are usually hidden away, Linux offers complete, unrestricted, and unapologetic control over them. You can terminate processes, change their properties, and learn every item of information there is to know about them. This provides ample scope for damaging the currently running system but, in spite of this, even standard users have complete control over processes that they personally started (one exception is zombie processes, described a bit later in this section). As you might expect, the root user (or any user who adopts superuser powers) has control over all processes that were created by ordinary users, as well as those processes started by the system itself. The user is given this degree of control over processes in order to enact repairs when something goes wrong, such as when a program crashes and won’t terminate cleanly. It’s impossible for standard users to damage the currently running system by undertaking such work, although they can cause themselves a number of problems.
- 405. CHAPTER 16 ■ TAKING CONTROL OF THE SYS TEM 369 ■Note This control over processes is what makes Linux so reliable. Because any user can delve into the workings of the kernel and terminate individual processes, crashed programs can be cleaned up with negligible impact on the rest of the system. Killing Processes Whenever you quit a program or, in some cases, when it completes the task you’ve asked of it, it will terminate itself. This means ending its own process and also that of any other processes it created in order to run. The main process is called the parent, and the ones it creates are referred to as child processes. ■Tip You can see a nice graphical display of which parent owns which child process by typing pstree at the command-line shell. It’s worth piping this into the less command so you can scroll through it: type pstree | less. We explain what piping is in the next chapter. While this should mean your system runs smoothly, badly behaved programs some- times don’t go away. They stick around in the process list. Alternatively, you might find that a program crashes and so isn’t able to terminate itself. In very rare cases, some programs that appear otherwise healthy might get carried away and start consuming a lot of system resources. You can tell when this happens because your system will start slowing down for no reason, as less and less memory and/or CPU time is available to run actual programs. In all of these cases, the user usually must kill the process in order to terminate it manually. This is easily done using top. The first task is to track down the crashed or otherwise problematic process. In top, look for a process that matches the name of the program, as shown in Figure 16-2. For example, the Firefox web browser generally runs as a process called firefox-bin. Figure 16-2. You can normally identify a program by its name in the process list.
- 406. 370 CHAPTER 16 ■ TAK ING CONTROL OF THE SYS TE M ■Caution You should be absolutely sure that you know the correct process before killing it. If you get it wrong, you could cause other programs to stop running. Because top doesn’t show every single process on its screen, tracking down the trouble- causing process can be difficult. A handy tip is to make top show only the processes created by the user you’re logged in under. This will remove the background processes started by root. You can do this within top by typing u and then entering your username. Once you’ve spotted the crashed process, make a note of its PID number, which will be at the very left of its entry in the list. Then type k. You’ll be asked to enter the PID number. Enter that number, and then press Enter once again (this will accept the default signal value of 15, which will tell the program to terminate). With any luck, the process (and the program in question) will disappear. If it doesn’t, the process you’ve killed might be the child of another process that also must be killed. To track down the parent process, you need to configure top to add the PPID field, for the parent process ID, to its display. To add this field, type f, and then b. Press Enter to return to the process list. The PPID column will appear next to the process name on the right of the window. It simply shows the PID of the parent process. You can use this information to look for the parent process within the main list of processes. The trick here is to make sure that the parent process isn’t something that’s vital to the running of the system. If it isn’t, you can safely kill it. This should have the result of killing the child process you uncovered prior to this. ■Caution In both the PPID and PID fields, you should always watch out for low numbers, particularly one-, two- or three-digit numbers. These are usually processes that started early on when Linux booted and that are essential to the system. Controlling Zombie Processes Zombie processes are those that are children of processes that have terminated. However, for some reason, they failed to take their child processes with them. Zombie processes are rare on most Linux systems. Despite their name, zombie processes are harmless. They’re not actually running and don’t take up system resources. However, if you want your system to be spick-and-span, you can attempt to kill them. In the top-right area of top, you can see a display that shows how many zombie processes are running on your system, as shown in Figure 16-3. Zombie processes are easily identified because they have a Z in the status (S) column within top’s process list. To kill a zombie
- 407. CHAPTER 16 ■ TAKING CONTROL OF THE SYS TEM 371 process, type k, and then type its PID. Then type 9, rather than accept the default signal of 15. Figure 16-3. You can see at a glance how many zombie processes are on your system by looking at the top right of top’s display. ■Note No magic is involved in killing processes. All that happens is that top sends them a “terminate” signal. In other words, it contacts them and asks them to terminate. By default, all processes are designed to listen for commands such as this; it’s part and parcel of how programs work under Linux. When a program is described as crashed, it means that the user is unable to use the program itself to issue the terminate command (such as Quit). A crashed program might not be taking input, but its processes will probably still be running. In many cases, zombie processes simply won’t go away. When this happens, you have two options. The first is to restart the program that is likely to be the zombie’s owner, in the hope that it will reattach with the zombie, and then quit the program. With any luck, it will take the zombie child with it this time. Alternatively, you can simply reboot your PC. But it’s important to note that zombie processes are harmless and can be left in peace on your system! Using Other Commands to Control Processes You don’t always need to use top to control processes. A range of quick and cheerful shell commands can diagnose and treat process problems. The first of these is the ps command. This stands for Process Status and will report a list of currently running processes on your system. This command is normally used with the -aux options: ps –aux This will return a list something like what you see when you run top.
- 408. 372 CHAPTER 16 ■ TAK ING CONTROL OF THE SYS TE M If you can spot the problematic process, look for its PID and issue the following command: kill <PID number> For example, to kill a process with a PID of 5122, you would type this: kill 5122 If, after this, you find the process isn’t killed, then you should use the top program, as described in the previous sections, because it allows for a more in-depth investigation. Another handy process-killing command lets you use the actual process name. The killall command is handy if you already know from past experience what a program’s process is called. For example, to kill the process called firefox-bin, which is the chief process of the Firefox web browser, you would use the following command: killall firefox-bin ■Caution Make sure you’re as specific as possible when using the killall command. Issuing a command like killall bin will kill all processes that might have the word bin in them! CLEARING UP CRASHES Sometimes, a crashed process can cause all kinds of problems. The shell you’re working at may stop working, or the GUI itself might stop working properly. In cases like this, it’s important to remember that you can have more than one instance of the command-line shell up and running at any one time. For example, if a process crashes and locks up GNOME Terminal, simply start a new instance of GNOME Terminal (Applications ➤ Accessories ➤ Terminal). Then use top within the new window to kill the process that is causing trouble for the other terminal window. If the crashed program affects the entire GUI, you can switch to a virtual console by pressing Ctrl+Alt+F1. Although the GUI disappears, you will not have killed it, and no programs will stop running. Instead, you’ve simply moved the GUI to the background while a shell console takes over the screen. Then you can use the virtual console to run top and attempt to kill the process that is causing all the problems. When you’re ready, you can switch back to the GUI by pressing Ctrl+Alt+F7. If you know the name of the program that’s crashed, a quick way of getting rid of it is to use the pgrep command. This searches the list of processes for the program name you specify and then outputs the PID number. So if, say, Nautilus had frozen, you could type pgrep nautilus. Then you would use the kill command with the PID number that’s returned.
- 409. CHAPTER 16 ■ TAKING CONTROL OF THE SYS TEM 373 Controlling Jobs Whenever you start a program at the shell, it’s assigned a job number. Jobs are quite sepa- rate from processes and are designed primarily for users to understand what programs are running on the system. You can see which jobs are running at any one time by typing the following at the shell prompt: jobs When you run a program, it usually takes over the shell in some way and stops you from doing anything until it’s finished what it’s doing. However, it doesn’t have to be this way. Adding an ampersand symbol (&) after the command will cause it to run in the background. This is not much use for commands that require user input, such as vim or top, but it can be very handy for commands that churn away until they’re completed. For example, suppose that you want to decompress a large zip file. For this, you can use the unzip command. As with Windows, decompressing large zip files can take a lot of time, during which time the shell would effectively be unusable. However, you can type the following to retain use of the shell: unzip myfile.zip & When you do this, you’ll see something similar to the following, although the four-digit number will be different: [1] 7483 This tells you that unzip is running in the background and has been given job number 1. It also has been given process number 7483 (although bear in mind that when some programs start, they instantly kick off other processes and terminate the one they’re currently running, so this won’t necessarily be accurate). ■Tip If you’ve ever tried to run a GUI program from the shell, you might have realized that the shell is inaccessible while it’s running. Once you quit the GUI program, the control of the shell will be returned to you. By specifying that the program should run in the background with the & (ampersand symbol), you can run the GUI program and still be able to type away and run other commands.
- 410. 374 CHAPTER 16 ■ TAK ING CONTROL OF THE SYS TE M You can send several jobs to the background, and each one will be given a different job number. In this case, when you wish to switch to a running job, you can type its number. For example, the following command will switch you to the background job assigned the number 3: %3 You can exit a job that is currently running by pressing Ctrl+Z. It will still be there in the background, but it won’t be running (officially, it’s said to be sleeping). To restart it, you can switch back to it, as just described. Alternatively, you can restart it but still keep it in the background. For example, to restart job 2 in the background, leaving the shell prompt free for you to enter other commands, type the following: %2 & You can bring the command in the background into the foreground by typing the following: fg When a background job has finished, something like the following will appear at the shell: [1]+ Done unzip myfile.zip Using jobs within the shell can be a good way of managing your workload. For example, you can move programs into the background temporarily while you get on with something else. If you’re editing a file in vim, you can press Ctrl+Z to stop the program. It will remain in the background, and you’ll be returned to the shell, where you can type other commands. You can then resume vim later on by typing fg or typing % followed by its job number. ■Tip Also useful is Ctrl+C, which will kill a job that’s currently running. For example, if you previously started the unzip command in the foreground, hitting Ctrl+C will immediately terminate it. Ctrl+C is useful if you accidentally start commands that take an unexpectedly long time to complete.
- 411. CHAPTER 16 ■ TAKING CONTROL OF THE SYS TEM 375 NOHUP What if you want to start a command running in a terminal window, but then want to close that terminal window? As soon as you close the window, any processes started within it are also closed. Try this now—type gcalctool at the prompt to start the Calculator application and then quit the terminal window. To get around this, you can use the nohup command. This stands for “no hangup,” and in simple terms, it tells the command you specify to stick around, even after the process that started it has ended (technically, the command is told to ignore the SIGHUP signal). However, commands run via nohup can still be killed. To use nohup, simply add it before the command, for example: nohup unzip myfile.zip If the command requires sudo or gksu powers, add either of these after the nohup command. Any command output (including error messages) is sent to the file nohup.out, which you can then view in a text editor. Note that if you run a command via nohup using sudo or gksu, the nohup.out file will have root privileges. If that’s the case, you will also have to delete the nohup.out file via sudo before you can use nohup again as an ordinary user, because otherwise, nohup will be unable to over- write the root-owned nohup.out. Summary This chapter has covered taking complete control of your system. We’ve looked at what processes are, how they’re separate from programs, and how they can be controlled or viewed using programs such as top and ps. In addition, we explored job management under BASH. You saw that you can stop, start, and pause programs at your convenience. In the next chapter, we’ll take a look at several tricks and techniques that you can use with the BASH shell to finely hone your command-line skills.
- 413. CHAPTER 17 ■■■ Cool Shell Tricks T he BASH shell is the product of many years of development work by a lot of people. It comes from the old days of Unix and was an important step in computer software evolu- tion. It’s a program that retains complete simplicity, yet packs in more features than most users could ever hope to use. One of the best things about the shell is its sheer power. If you ever wonder if you can do a task differently (and more efficiently), you’ll probably find that one of the many BASH developers has implemented a method to do so. Once you learn these techniques, you’ll find you can whiz around the shell at blinding speed. It’s just a matter of exploring the far reaches of the shell, and that’s what you’ll do in this chapter. Hold onto your hats, because it’s an exciting ride! Using Autocompletion The Tab key is your best friend when using the shell, because it will cause BASH to auto- matically complete whatever you type. For example, if you want to run Ubuntu’s web browser, you can enter firefox at the command line. However, to save yourself some time, you can type fir, and then press Tab. You’ll then find that BASH fills in the rest for you. It does this by caching the names of the programs you might run according to the direc- tories listed in your $PATH variable (see Chapter 13). Of course, autocompletion has some limitations. On my Ubuntu test system, typing loc didn’t autocomplete locate. Instead, it caused BASH to beep. This is because on a default Ubuntu installation, there is more than one possible match. Pressing Tab again shows those matches. Depending on how much you type (how much of an initial clue you give BASH), you might find there are many possible matches. In this case, the experienced BASH user simply types another letter, which will be enough to distinguish the almost-typed word from the rest, and presses Tab again. With any luck, this should be enough for BASH to fill in the rest. 377
- 414. 378 CHAPTER 17 ■ C OOL S HELL TRICK S Autocompletion with Files and Paths Tab autocompletion also works with files and paths. If you type the first few letters of a folder name, BASH will try to fill in the rest. This also obviously has limitations. There’s no point in typing cd myfol and pressing Tab if there’s nothing in the current directory that starts with the letters myfol. This particular autocomplete function works by looking at your current directory and seeing what’s available. Alternatively, you can specify an initial path for BASH to use in order to autocomplete. Typing cd /ho and pressing Tab will cause BASH to autocomplete the path by looking in the root directory (/). In other words, it will autocomplete the command with the directory home. In a similar way, typing cd myfolder/myfo will cause BASH to attempt to autocomplete by looking for a match in myfolder. If you want to run a program that resides in the current directory, such as one you’ve just downloaded for example, typing ./, followed by the first part of the program name, and then pressing Tab should be enough to have BASH autocomplete the rest. In this case, the dot and slash tell BASH to look in the current directory for any executable programs or scripts (programs with X as part of their permissions) and use them as possible auto- complete options. BASH is clever enough to spot whether the command you’re using is likely to require a file, directory, or executable, and it will autocomplete with only relevant file or directory names. Viewing Available Options The autocomplete function has a neat side effect. As we mentioned earlier, if BASH cannot find a match, pressing Tab again causes BASH to show all the available options. For example, typing ba at the shell, and then pressing Tab twice will cause BASH to show all the possible commands starting with the letters ba. On my test PC, this produces the following list of commands: badblocks banner baobab basename bash bashbug batch This can be a nice way of exploring what commands are available on your system. You can then use each command with the --help command option to find out what it does, or browse the command’s man page. When you apply this trick to directory and filename autocompletion, it’s even more useful. For example, typing cd in a directory, and then pressing the Tab key twice will cause BASH to show the available directories, providing a handy way of retrieving a brief
- 415. C HA PTE R 17 ■ COOL SHELL TRIC KS 379 directory listing. Alternatively, if you’ve forgotten how a directory name is spelled, you can use this technique to find out prior to switching into it. Figure 17-1 shows a few examples of using this technique with BASH. Figure 17-1. Autocompletion makes using BASH much easier. Using Keyboard Shortcuts Your other good friends when using BASH are the Ctrl and Alt keys. These keys provide shortcuts to vital command-line shell functions. They also let you work more efficiently when typing by providing what most programs call keyboard shortcuts. Shortcuts for Working in BASH Table 17-1 lists the most common keyboard shortcuts in BASH (there are many more; see BASH’s man page for details). If you’ve explored the Emacs text editor, you might find these shortcuts familiar. Such keyboard shortcuts are largely the same across many of the software packages that originate from the GNU Project. Often, you’ll find an option within many Ubuntu software packages that lets you use Emacs-style navigation, in which case, these keyboard shortcuts will most likely work equally well.
- 416. 380 CHAPTER 17 ■ C OOL S HELL TRICK S Table 17-1. Keyboard Shortcuts in BASH Shortcut Description Navigation Left/right cursor key Move left/right in text Ctrl+A Move to beginning of line Ctrl+E Move to end of line Ctrl+right arrow Move forward one word Ctrl+left arrow Move left one word Editing Ctrl+U Delete everything behind cursor to start of line Ctrl+K Delete from cursor to end of line Ctrl+W Delete from cursor to beginning of word Alt+D Delete from cursor to end of word Ctrl+T Transpose characters on left and right of cursor Alt+T Transpose words on left and right of cursor Miscellaneous Ctrl+L Clear screen (everything above current line) Ctrl+U Undo everything since last command1 Alt+R Undo changes made to the line2 Ctrl+Y Undo deletion of word or line caused by using Ctrl+K, Ctrl+W, and so on3 Alt+L Lowercase current word (from the cursor to end of word) 1 In most cases, this has the effect of clearing the line. 2 This is different from Ctrl+U, because it will leave intact any command already on the line, such as one pulled from your command history. 3 This allows primitive cutting and pasting. Delete the text and then immediately undo, after which the text will remain in the buffer and can be pasted with Ctrl+Y. Shortcuts for System Control In terms of the control over your system offered by keyboard commands, as mentioned in Chapter 16, pressing Ctrl+Z has the effect of stopping the current program. It suspends the program until you switch back into it or tell it to resume in another way, or manually kill it. In the same style, pressing Ctrl+C while a program is running will quit it. This sends the program’s process a termination signal, a little like killing it using the top program. Ctrl+C can prove handy if you start a program running by accident and quickly want to end it, or if a command takes longer than you expected to work and you cannot wait for it to complete.
- 417. C HA PTE R 17 ■ COOL SHELL TRIC KS 381 It’s also a handy way of attempting to end crashed programs. Some complicated programs don’t take too kindly to being quit in this way, particularly those that need to save data before they terminate. However, most should be okay. Ctrl+D is another handy keyboard shortcut. This sends the program an end-of-file (EOF) message. In effect, this tells the program that you’ve finished your input. This can have a variety of effects, depending on the program you’re running. For example, pressing Ctrl+D on its own at the shell prompt when no program is running will cause you to log out (if you’re using a GUI terminal emulator like GNOME Terminal, the program will quit). This happens because pressing Ctrl+D informs the BASH shell program that you’ve finished your input. BASH then interprets this as the cue that it should log you out. After all, what else can it do if told there will be no more input? While it might not seem very useful for day-to-day work, Ctrl+D is vital for programs that expect you to enter data at the command line. You might run into these as you explore BASH. If ever you read in a man page that a program requires an EOF message during input, you’ll know what to press. Using the Command History The original hackers who invented the tools used under Unix hated waiting around for things to happen. After all, being a hacker is all about finding the most efficient way of doing any particular task. Because of this, the BASH shell includes many features designed to optimize the user experience. The most important of these is the command history. BASH remembers every command you enter (even the ones that don’t work!) and stores them as a list on your hard disk. During any BASH session, you can cycle through this history using the up and down arrow keys. Pressing the up arrow key takes you back into the command history, and pressing the down arrow key takes you forward. The potential of the command history is enormous. For example, rather than retype that long command that runs a program with command options, you can simply use the cursor keys to locate it in the history and press Enter. ■Tip Typing !-3 will cause BASH to move three paces back in the history file and run that command. In other words, it will run what you entered three commands ago. On my Ubuntu test system, BASH remembers 1000 commands. You can view all of the remembered commands by typing history at the command prompt. The history list will scroll off the screen because it’s so large, but you can use the scroll bars of the GNOME Terminal window to read it.
- 418. 382 CHAPTER 17 ■ C OOL S HELL TRICK S Each command in the history list is assigned a number. You can run any of the history commands by preceding their number with an exclamation mark (!), referred to as a bang, or sometimes a shriek. For example, you might type !923. On my test system, command number 923 in the BASH history is cd .., so this has the effect of switching me into the parent directory. Command numbering remains in place until you log out (close the GNOME Terminal window or end a virtual console session). After this, the numbering is reordered. There will still be 1000 commands, but the last command you entered before logging out will be at the end of the list, and the numbering will work back 1000 places until the first command in the history list. ■Tip One neat trick is to type two bangs: !!. This tells BASH to repeat the last command you entered. Rather than specifying a command number, you can type something like !cd. This will cause BASH to look in the history file, find the last instance of a command line that started with cd, and then run it. Pressing Ctrl+R lets you search the command history from the command prompt. This particular tool can be tricky to get used to, however. As soon as you start typing, BASH will autocomplete the command based on matches found in the history file, starting with the last command in the history. What you type appears before the colon, while the auto- completion appears afterwards. Because BASH autocompletes as you type, things can get a little confusing when you’re working with the command history, particularly if it initially gets the match wrong. For example, typing cd will show the last instance of the use of cd, as in the example in Figure 17-2. This might not be what you’re looking for, so you must keep typing the command you do want until it autocompletes correctly. Figure 17-2. BASH history completion is very useful but can also be confusing.
- 419. C HA PTE R 17 ■ COOL SHELL TRIC KS 383 Piping and Directing Output It’s not uncommon for a directory listing or output from another command to scroll off the screen. When using a GUI program like GNOME Terminal, you can use the scroll bars to view the output, but what if you are working at the bare command-line prompt? By pressing Shift+Page Up and Shift+Page Down, you can “scroll” the window up to take a look at some of the old output, but very little is cached in this way, and you won’t see more than a few screens. A far better solution is to pipe the output of the directory listing into a text viewer. Another useful technique is to redirect output to a file. Piping the Output of Commands Piping was one of the original innovations provided by Unix. It simply means that you can pass the output of one command to another, which is to say the output of one command can be used as input for another. This is possible because shell commands work like machines. They usually take input from the keyboard (referred to technically as standard input) and, when they’ve done their job, usually show their output on the screen (known as standard output). The commands don’t need to take input from the keyboard, and they don’t need to output to the screen. Piping is the process of diverting the output before it reaches the screen and passing it to another command for further processing. Let’s assume that you have a directory that is packed full of files. You want to do a long directory listing (ls –l) to see what permissions various files have. But doing this produces reams of output that fly off the screen. Typing something like the following provides a solution: ls –l | less The | symbol between the two commands is the pipe. It can be found on most US keyboards next to the square bracket keys (near the Enter key; you’ll need to hold down the Shift key to get it). What happens in the example is that ls –l is run by the shell, but rather than sending the output to the screen, the pipe symbol (|) tells BASH to send it to the command that follows—to less. In other words, the listing is displayed within less, where you can read it at your leisure. You can use Page Up and Page Down or the arrow keys to scroll through it. Once you quit less, the listing evaporates into thin air; the piped output is never actually stored as a file. In the previous section, you saw how you can use the history command to view the command history. At around 1000 entries, its output scrolls off the screen in seconds. However, you can pipe it to less, like so: history | less
- 420. 384 CHAPTER 17 ■ C OOL S HELL TRICK S Figure 17-3 shows the result on my test PC. Figure 17-3. Piping the output of the history command into the less command lets you read the output fully. You can pipe the output of any command. One of the most common uses is when searching for a particular string in the output of a command. For example, let’s say you know that, within a crowded directory, there’s a file with a picture of some flowers. You know that the word flower is in the filename, but can’t recall any other details. One solution is to perform a directory listing, and then pipe the results to grep, which is able to search through text for a user-defined string (see Chapter 15): ls –l | grep –i 'flower' In this example, the shell runs the ls –l command, and then passes the output to grep. The grep command then searches the output for the word flower (the –i option tells it to ignore uppercase and lowercase). If grep finds any results, it will show them on your screen. The key point to remember is that grep is used here as it normally is at the command prompt. The only difference is that it’s being passed input from a previous command, rather than being used on its own.
- 421. C HA PTE R 17 ■ COOL SHELL TRIC KS 385 You can pipe more than once on a command line. Suppose you know that the filename of the picture you want involves the words flower and daffodil, yet you’re unsure of where they might fall in the filename. In this case, you could type the following: ls –l | grep –i flower | grep -i daffodil This will pass the result of the directory listing to the first grep, which will search the output for the word flower. The second pipe causes the output from grep to be passed to the second grep command, where it’s then searched for the word daffodil. Any results are then displayed on your screen. Redirecting Output Redirecting is like piping, except that the output is passed to a file rather than to another command. Redirecting can also work the other way: the contents of a file can be passed to a command. If you wanted to create a file that contained a directory listing, you could type this: ls –l > directorylisting.txt The angle bracket (>) between the commands tells BASH to direct the output of the ls –l command into a file called directorylisting.txt. If a file with this name exists, it’s overwritten with new data. If it doesn’t exist, it’s created from scratch. You can add data to an already existing file using two angle brackets: ls –l >> directorylisting.txt This will append the result of the directory listing to the end of the file called directorylisting.txt, although, once again, if the file doesn’t exist, it will be created from scratch. Redirecting output can get very sophisticated and useful. Take a look at the following: cat myfile1.txt myfile2.txt > myfile3.txt As you learned in Chapter 15, the cat command joins two or more files together. If the command were used on its own without the redirection, it would cause BASH to print myfile1.txt on the screen, immediately followed by myfile2.txt. As far as BASH is concerned, it has joined myfile1.txt to myfile2.txt, and then sent them to standard output (the screen). By specifying a redirection, you have BASH send the output to a third file. Using cat with redirection is a handy way of combining two files. It’s also possible to direct the contents of a file back into a command. Take a look at the following: sort < textfile.txt > sortedtext.txt The sort command simply sorts words into alphanumeric order (it actually sorts them according to the ASCII table of characters, which places symbols and numbers before
- 422. 386 CHAPTER 17 ■ C OOL S HELL TRICK S alphabetic characters). Directly after the sort command is a left angle bracket, which directs the contents of the file specified immediately after the bracket into the sort command. This is followed by a right angle bracket, which directs the output of the command into another file. ■Tip To see a table of the ASCII characters, type man ascii at the command-line prompt. There aren’t many instances in day-to-day usage where you’ll want to use the left angle bracket. It’s mostly used with the text-based mail program (which lets you send e-mail from the shell), and in shell scripting, in which a lot of commands are combined together to form a simple program. REDIRECTING STANDARD ERROR OUTPUT Standard input and standard output are what BASH calls your keyboard and screen. These are the default input and output methods that programs use unless you specify something else, such as redirecting or piping output and input. When a program goes wrong, its error message doesn’t usually form part of standard output. Instead, it is output via standard error. Like standard output, this usually appears on the screen. Sometimes, it’s very beneficial to capture an error message in a text file. This can be done by redirecting the standard error output. The technique is very similar to redirecting standard output: cdrecord --scanbus 2> errormessage.txt The cdrecord command is used to burn CDs, and with the --scanbus command option, you tell it to search for CD-R/RW drives on the system, something which frequently results in an error message if your system is not properly configured. After the initial command, you see the redirection. To redirect standard error, all you need to do is type 2>, rather than simply >. This effectively tells BASH to use the second type of output: standard error. You can direct both standard output and standard error to the same file. This is done in the following way: cdrecord --scanbus > error.txt 2>&1 This is a little more complicated. The standard output from cdrecord --scanbus is sent to the file error.txt. The second redirect tells BASH to include standard error in the standard output. In other words, it’s not a case of standard output being written to a file, and then standard error being added to it. Instead, the standard error is added to standard output by BASH, and then this is written to a file.
- 423. C HA PTE R 17 ■ COOL SHELL TRIC KS 387 Summary In this chapter, we’ve looked at some tricks and tips to help you use the BASH shell more effectively. You’ve seen how BASH can help by autocompleting commands, filenames, and directories. You also learned about keyboard shortcuts that can be used to speed up operations within the shell. This chapter also covered the command history function and how it can be used to reuse old commands, saving valuable typing time. Finally, we looked at two key functions provided by BASH: redirection and piping. This involved the explanation of standard input, output, and error. In Part 5 of the book, starting with the next chapter, we move on to discuss the multi- media functionality within Ubuntu.
- 427. CHAPTER 18 ■■■ Digital Audio T oday’s PC is a multimedia powerhouse, and it’s hard to come across a home computer that doesn’t have at least a set of speakers attached. Some people take this to extremes and have surround-sound speakers on their computers, as well as large monitors for crystal-clear video playback. The people behind Ubuntu aren’t blind to this, and include not only audio playback software but also a video player with the distribution. In this chapter, you’ll learn how to listen to MP3s, CDs, and Internet radio on your Ubuntu system. You’ll also learn how to configure Skype, the most popular Internet telephony application. In the next chapter, you’ll learn how to manage video playback. Issues Surrounding Multimedia Playback As you might have read in the press, multimedia playback on computer devices, and Linux in particular, is hindered by a number of issues. The main ones are software patents and Digital Rights Management (DRM). Audio and video playback technologies such as MP3 and MPEG are patented in coun- tries that allow software to be patented, such as the United States. A patent protects the implementation of an idea, as opposed to copyright, which protects the actual software. Patents are designed to restrict distribution of the technology utilizing a particular idea, unless permission is granted, usually via a payment to the license holder. Because Linux is based on the sharing of computing technology and knowledge, organiza- tions like Ubuntu are fundamentally and philosophically opposed to any kind of software patenting. As such, they try to avoid distributing such software, which is why MP3 play- back is not supported natively within Ubuntu, for example. This doesn’t make playback of popular music and video files impossible, but it means that extra software must be down- loaded and installed (although the process is automated). Additionally, the use of patented software raises ethical issues, such as the fact that using patented software runs counter to the aims of Linux and the open source movement. 391
- 428. 392 CHAPTER 18 ■ DIGITAL A UDIO ■Note It isn’t the job of this book to dictate a position for you on the ethics of using software that has been patented. That’s something you must do on your own. It’s a very complicated issue, but Wikipedia has a good summary of the arguments: http://en.wikipedia.org/wiki/Software_patent. Much more devastating than patenting is DRM, a technology tied into audio or video playback software. It’s designed to control how, where, when, and on what device you can play certain media. For example, Apple’s iTunes DRM scheme means you can play back movies and some audio tracks bought from iTunes only on the iPod range of devices (including the Apple TV and iPhone range of devices) or using the iTunes software. DVD and Blu-ray movie players include forms of DRM called Content Scrambling System (CSS) and Advanced Access Content System (AACS), respectively, which prevent users from playing DVDs on computers unless special software is purchased. The situation for audio tracks is getting better, and many large music companies are slowly abandoning DRM on audio tracks they sell, but nearly all movie files remain affected. Perhaps it goes without saying that the Linux community, including the Ubuntu project, is fundamentally opposed to any kind of DRM. Because of this, practically no DRM software has been officially ported to Linux, so you can’t, for example, play music purchased via the Napster online store or movies purchased from the iTunes online store. Linux and other open-source projects are very resourceful and are often able to reverse- engineer technology formats in order to get around DRM or patent issues. But the laws in many countries—with the United States as a particularly strident example—prohibit reverse-engineering in this way. In addition, the laws in some countries seek to prohibit use of software resulting from this process. ■Note You may be wondering why music and movie corporations are so intent on enforcing DRM and patenting if these schemes give their customers such a hard time. To learn more, and to find out what you can do to help halt the progress of such technology, visit the Electronic Frontier Foundation’s web site: www.eff.org. Programmers have also come up with Free Software alternatives to proprietary formats. Examples include the Ogg media format, which is every bit as good as MP3 but is unen- cumbered by patent issues. We’ll look at using Ogg later in this chapter, in the “Choosing a Format” section; it’s an excellent way of avoiding issues surrounding patenting. However, at the moment, there’s no ideal open-source video format, or at least not one that’s in wide- spread use. As an end user migrating to Ubuntu from Windows or Mac OS X, it’s likely you’ll want to add support for MP3 and popular video file playback formats, at least until you can
- 429. CHAPTER 18 ■ DIGITAL A UDIO 393 switch over to open-source file formats. Throughout this and the next chapter, we’ll examine installing media playback software and using it in concert with Ubuntu’s built-in playback software, even though some of that software may have issues surrounding patenting. In one case, the software is designed to bypass the DRM scheme that protects DVD movie discs. ■Note The United States and Japan both have laws allowing software to be patented. Most other countries, including those within the European Union, do not currently allow software patents. Playing Audio Files Audio playback under Ubuntu is normally handled by the Rhythmbox player. This is a feature-packed piece of software that can play back audio files, podcasts, Internet radio, and even CDs. However, Totem, the Ubuntu movie player, can also play back digital audio files. Additionally, Sound Juicer can play audio CDs. Like many modern music players, Rhythmbox can also manage your music collection, arranging it into a library so you can locate songs easily and create playlists. This makes it a better choice for playback if you have many digital audio files, although Totem is good for quick playback of individual files, such as auditioning those you’ve just downloaded. Out of the box, Ubuntu supports playback of Ogg Vorbis and FLAC across all its audio playback applications. These are two open-source audio file formats, which you’ll learn more about in the “Choosing a Format” section later in this chapter. To play back other music file formats, such as the ubiquitous MP3 format, additional software known as codecs must be installed. A codec handles the decoding (and also encoding) of multimedia files, both audio and video. The word is a shortened version of coder-decoder. For any digital multimedia file type you want to play on your computer, you’ll need an appropriate codec. In addition, if you wish to create your own multimedia files—for example, to create MP3s from CD audio tracks—you might need to download an additional codec that allows the encoding of files. Installation of codec software is largely automated. However, the issue of patenting continues to have an impact on the distribution of codecs. What’s more, the issue has not been resolved with 100% clarity, leaving many end users in a legal gray area. Several audio codecs available for Linux, contained in various gstreamer-plugins software packages, are not licensed with the patent holders. This is of little issue to you, as an end user. It’s a practical concern only for the distributors of the codecs, because the laws of some coun- tries state that it’s their duty to pay patent licensing fees. But it’s something you should be aware of.
- 430. 394 CHAPTER 18 ■ DIGITAL A UDIO MULTIMEDIA PLAYBACK COMPONENTS In simple terms, three software components are needed for multimedia playback under Ubuntu: • Player application: This is the software that’s actually used to listen to music or display videos. It’s the part of the multimedia system that you interact with. Under Ubuntu, Totem Movie Player is used to play back video, and Rhythmbox is used to handle audio. However, if you install the KDE desktop, Kaffeine will be used to play back movies, and armaroK will be used to handle audio playback. • Multimedia framework: This is the behind-the-scenes middleman that puts the player applica- tion in touch with the codec plug-ins. The multimedia framework preferred by Ubuntu is called GStreamer; the multimedia framework preferred by KDE is called Xine. The multimedia framework is a background component of your system, and you won’t come into direct contact with it, apart from when you’re initially configuring your system for media playback. However, it’s important to note that more than one multimedia framework can be installed, because this is sometimes necessary to utilize certain codecs. In Chapter 19, you will learn how to install an additional frame- work in order to fully support DVD playback under Ubuntu. • Codec plug-ins: Codecs are the small pieces of software that handle multimedia file decoding. Codecs do all the hard work—the number-crunching. Most multimedia file formats are compressed, to make for smaller file sizes, and the codec’s job is to expand the files again, so that they can be played back on your computer. Some codecs also work the other way around by shrinking files; if you rip CD tracks to MP3, or convert DVD videos to movie files on your hard disk, you will need to shrink them for ease of storage. Under Ubuntu, the GStreamer multimedia framework is installed by default, along with a handful of codecs. Installing Codecs The codec software necessary for multimedia file playback and encoding can be found in Ubuntu’s online software repositories. However, there’s no need to use the Synaptic Package Manager program to install them manually. Multimedia applications automatically suggest which codecs to download and install when they attempt to play multimedia files. What actually happens is that plug-ins for the GStreamer multimedia framework are installed. These plug-ins contain the codec software. The multimedia framework is the behind-the-scenes software that underpins all of Ubuntu’s audio and video playback, including the Rhythmbox audio player and Totem Movie Player. As a user, you won’t come into direct contact with GStreamer, except when initially installing codecs. The benefit is that all of Ubuntu’s audio and video software uses it, so you need to install plug- ins only once for the entire system.
- 431. CHAPTER 18 ■ DIGITAL A UDIO 395 Here, we will walk through installing the codec required for MP3 playback. The same procedure will apply when you try to play back any unsupported audio or video file format; all that will differ is the choice of codecs offered to you: 1. Copy an MP3 file to your desktop. 2. Double-click the MP3 file. 3. Totem Movie Player will start up, but because the underlying GStreamer framework doesn’t yet include support for MP3 files, a dialog box will appear, asking if you want to look for a suitable codec to play the file. Click the Search button to do so. The process is automated, but your computer will need to go online, if it isn’t already. ■Note You might be told your list of software packages is out-of-date. If this is the case, click the Reload button in the dialog box that appears. This will refresh the repository list; it’s the equivalent of clicking the Reload button in the Synaptic Package Manager. 4. The Install Multimedia Codecs dialog box will eventually appear, offering a choice of plug-ins to install. You’ll rarely be offered an individual codec to install. Most are bundled together with similar codecs allowing the playback of other file formats. As you can see in Figure 18-1, for playback of MP3 files, we were offered the GStreamer extra plugins bundle and the GStreamer ffmpeg video plugin. In addition to allowing MP3 playback, these bundles will install software for playback of audio/video files encoded in MPEG1/2, WMV, ASF, and other formats. Although there are two choices, and therefore obviously some overlap in functionality, you should opt to install both by putting a check in the boxes alongside them. Ubuntu will handle any over- lapping functionality automatically in the background. It’s always best to install as many codecs as possible when offered the chance. This will mean your computer will be suitably equipped for playback of virtually any file type. ■Note In case you’re wondering why a plug-in seemingly offering nothing but video playback would include support for MP3, the reason is that MP3 is actually one of the many audio components of the MPEG video file format. For more information, see http://en.wikipedia.org/wiki/MP3. 5. As soon as you put a check in each box, Ubuntu will ask you to confirm the choice, and will explain that use of the software might be restricted in certain countries, although with certain provisos. Read through the dialog box and either cancel or confirm your choice, depending on whether you think the rules explained apply to you.
- 432. 396 CHAPTER 18 ■ DIGITAL A UDIO Figure 18-1. Ubuntu recommends codec packages to install so you can play your multimedia files. 6. Click the Install button. Because you are about to install software, you’ll need to enter your password when prompted. Note that, although you appeared to select two packages, you actually selected to install package bundles, containing many individual packages. On the progress bar, you will see that quite a few individual packages are being downloaded—about 14 on our test computer! 7. The files will download and install automatically. Once the process has completed, a dialog box will tell you that everything has been successful, and ask if you want to install more software. Click the Close button. 8. Playback of the file should start automatically in the player application. Every piece of playback software within Ubuntu will now automatically support MP3 files, including Totem, Rhythmbox, and any other playback software you install that relies on the GStreamer framework (this will include any playback software designed for the GNOME desktop).
- 433. CHAPTER 18 ■ DIGITAL A UDIO 397 FLUENDO MP3 CODEC As mentioned, some codecs available for Ubuntu have certain legal issues surrounding the patenting of software. However, you might be pleased to hear that one audio codec available for Ubuntu is licensed with the MP3 patent holder, and therefore washes cleaner than clean: the Fluendo MP3 codec. In an act of generosity, the Fluendo company paid the MP3 technology license and made its own decoder freely available for all Linux users. For more information, see www.fluendo.com/resources/ fluendo_mp3.php. The Fluendo codec doesn’t avoid the ethical considerations surrounding using patented technology, as discussed early in this chapter, but it does leave you in the best possible position. However, the Fluendo codec can be used only to decode MP3 audio. It can’t be used to encode MP3s, so if you wish to rip tracks to MP3 from audio CDs, you will have to use the less legally precise GStreamer plug-in packages (or, better still, encode your audio files using the open-source Ogg Vorbis format, which avoids patenting issues and doesn’t require installing any additional plug-ins!). We would advise you to install the Fluendo codec if you simply want to listen to your existing MP3 tracks and would like to embrace open-source audio file formats from this point onward. To install the Fluendo codec, open the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager) and click the Search button. Enter gstreamer fluendo mp3 in the text box. It’s likely only one result will be returned (in our tests, it was gstreamer0.10-fluendo-mp3), so click the check box alongside the entry, click Mark for Installation, and then click the Apply button on the toolbar. Once the software is installed, MP3 files should play in both Totem and Rhythmbox. Using Rhythmbox Both Rhythmbox and Totem can be used for audio file playback under Ubuntu. Rhythmbox is best if you have a lot of tunes, because it is able to catalog and manage your collection. You’ll find it on the Applications ➤ Sound & Video menu. The first step when running Rhythmbox for the first time is to let it index your music files. To do so, click Music ➤ Import File or Music ➤ Import Folder. Then navigate to your music tracks on the hard disk. You can select more than one file or folder by Shift-clicking or Ctrl-clicking, just as in Windows. Note that, unlike iTunes or some other comparable programs, Rhythmbox doesn’t copy your music to its own library folders when cataloging your files. Instead, it merely creates an index of the files you already have. So before having Rhythmbox index your files, you should copy them to the Music folder within your /home directory. If you subsequently move or delete any files, Rhythmbox might get confused. This can be resolved by clicking Music ➤ Import Folder and rebuilding the index (for single files, click Music ➤ Import File).
- 434. 398 CHAPTER 18 ■ DIGITAL A UDIO ■Tip If disk space is a concern and your audio files are in the Windows partition, you could simply leave the files there, rather than copy them across. Rhythmbox will still be able to index them. You just need to navigate to your Windows partition under the /media directory when choosing to index files. The only caveat is if Windows wasn’t shut down cleanly, the Windows partition will not be mounted automatically under Ubuntu, so your music will not be available. To fix the situation, you should instead boot to Windows, do a file system check/repair, and then shut down cleanly. Rhythmbox starts in browse mode, which means that your music files are listed at the bottom of the program window. In roughly the middle-left of the program window, you’ll find a listing of the artists behind the MP3s in your collection. On the right, you’ll see the album that the music track is taken from (provided that information is included in the music file itself, such as the MP3 ID3 tags). Figure 18-2 shows an example of a Rhythmbox window. Figure 18-2. Rhythmbox will organize your music tracks by artist or album.
- 435. CHAPTER 18 ■ DIGITAL A UDIO 399 Clicking the Browse button on the toolbar will exit browse mode and present a list of the tracks in your collection, which can be ordered by clicking the headings in the list. The default sort order is by artist. Playing a track is simply a matter of double-clicking it in the list at the bottom. Once the track is finished, Rhythmbox will play the next track in the MP3 file list. At the top of the Rhythmbox window are transport controls that let you pause or play the track, skip tracks, repeat tracks, or switch to shuffle play (that is, random track selection). You can toggle displaying visual effects with the Visualization button. The display output is shown in the main window by default. The controls for customizing the effects are available at the bottom of the visual effects display and are made visible when you hover your mouse over the visual effects. You have the option to change the nature of the visualization effect; the quality of the effect; and whether the effect will be displayed within Rhythmbox, in a different window, or in full-screen mode. Beneath the transport controls is a slider that shows the progress through the current song and lets you cue forward and backward by clicking and dragging. To create a new playlist, click Music ➤ Playlist ➤ New Playlist (or press Ctrl+N). A text box will appear under the Playlists heading in the pane on the far left side of the program window. Type the new playlist’s name in the text box and press Enter. To add tracks to the playlist, click Music under the Library heading in the pane on the far left side of the program window, and then drag-and-drop files onto your new playlist entry. To start playing the tracks in the playlist, select it and double-click the first track in the list. ■Note When you double-click an audio file in a Nautilus window, Ubuntu will start Totem Movie Player rather than Rhythmbox. This is good if you want to preview tracks, but to have them automatically imported into Rhythmbox when you double-click them, you’ll need to change the Open With preferences. This is easily done. Right-click any MP3 file in a Nautilus file browsing window, select Properties, and click the Open With tab. Ensure that the radio button alongside its entry in the list is selected, and then click the Close button. Purchasing from Online Music Stores Rhythmbox allows you to purchase albums from the Magnatune (www.magnatune.com) and Jamendo (www.jamendo.com) online music stores. Jamendo works on the principle of Creative Commons (see http://creativecommons.org), so many tracks are free of charge, although you can donate money if you wish. Under the Stores heading on the leftmost pane of the Rhythmbox window, click Magnatune or Jamendo. You’ll see a brief introduction to the store while the catalog is downloaded. After the catalog is downloaded (indicated by the status bar at the bottom right of the program window), you will be able to browse through the available tracks, as if they were on your own computer. They will be sorted by artist and track name. Double- clicking each track will download and play a high-quality preview.
- 436. 400 CHAPTER 18 ■ DIGITAL A UDIO ■Note It might take a few moments for the catalog to download. In our tests, the Jamendo catalog took about 10 minutes to download. You’ll also see that the main toolbar of Rhythmbox has changed. Several new icons appear, allowing you to purchase and download the album, buy a physical CD, or learn more about the artist. Purchasing from Magnatune With Magnatune, you can listen to any of the songs in the album without paying for them. Any songs you do decide to purchase are free from copy protection (DRM), and artists earn 50% from your purchase. You can choose how much to pay for an album (the minimum is $5). ■Tip You can learn more about artists by viewing their Magnatune web pages. Click a relevant track and click the Artist Information button on the toolbar. This will automatically load the relevant page in Firefox. To purchase an album, select a song in the music list that is included in the album you would like to purchase, and then click the Purchase Album button on the toolbar. The Purchase Magnatune Tracks dialog box will appear and prompt you for the amount you want to pay (from $5 to $18), as well as the audio format you prefer (Ogg, FLAC, WAV, vari- able bitrate MP3, or 128k MP3), plus e-mail address and gift card or credit card information. Once you’ve finished filling in the information, click the Purchase button to buy and download the songs. To purchase a CD, click the relevant button on the toolbar. Firefox will open, and you’ll be redirected to a page on the Magnatune web site where you can fill in your credit card and address details. Using the Jamendo Store Songs from Jamendo are free to listen to, download, and share, due to its flexible license based on Creative Commons. If you opt to purchase tracks of albums, 50% of the proceeds go to the artist. ■Tip Not only can you download the tracks from Jamendo, but you can also remix them or use snippets of them in your own music. All of this is because of the use of the Creative Commons license.
- 437. CHAPTER 18 ■ DIGITAL A UDIO 401 If you want to download an album, select a song in the music list that is included in the album you would like to download, and then click the Download Album button on the toolbar. Firefox will visit a URL that includes a BitTorrent tracker file—effectively, a small file that opens the Transmission BitTorrent client built into Ubuntu. BitTorrent will then attempt to download the entire album. ■Note BitTorrent is a unique file-sharing system designed to share bandwidth. Depending on your hard- ware setup, you might need to alter your router or firewall settings for it to work. For more information, see www.dessent.net/btfaq/. If you want to make a donation to an artist, select a song in the music list that the artist performed and click the Donate to Artist button on the toolbar. Firefox will direct you to a web site where you can fill in a form to complete your donation. Tuning In to Online Radio Stations With Rhythmbox, you can listen to a number of predefined Internet radio stations or add your own. Provided the MP3 codec software is installed, as discussed previously, Rhythmbox is compatible with streaming MP3-based playlists, such as those listed at http:// shoutcast.com. To view the available stations, click the Radio heading in the list on the left side of the Rhythmbox window. To listen to a radio station with Rhythmbox, double-click its entry in the list. To stop playback, deselect the Play button on the toolbar by clicking it. To add a new station, you can do either of the following: • Right-click in a blank area below the list of existing stations on the right side of the program window and click New Internet Radio Station. Then enter its URL. Radio stations usually show the URL for their audio streams on their web sites. • Open the radio station’s playlist (.pls) within Rhythmbox by downloading it directly from a web site. For example, browsing to the Shoutcast web site and clicking the Tune In button alongside a station listed there will open a dialog box that lets you download or open the .pls file. Opening the .pls file is the easier way of adding a radio station, but unfortunately, the default player in Ubuntu for .pls files is Totem, which can cause some confusion. However, the situation can be remedied easily. To open the .pls file with Rhythmbox instead, follow these steps:
- 438. 402 CHAPTER 18 ■ DIGITAL A UDIO 1. Under the Open With drop-down list that appears when you attempt to download a .pls file, select Other, and then click OK. 2. The Choose Helper Application dialog box appears. Press Ctrl+L, and then type the following in the Location box: /usr/bin/rhythmbox. 3. Click Open. 4. To make sure that Rhythmbox is the default helper application in Firefox for .pls files that you will download or open in the future in Firefox, in the file download dialog box, check Do This Automatically for Files Like This from Now On, and then click OK. Once the station has been imported into the list of stations, you’ll then need to double- click its entry to tune in. Note that when Rhythmbox starts after you import a station, it won’t automatically switch to the radio station listing. You’ll need to select the Radio entry from the list on the left. To delete a radio station from the list, simply right-click it and select Delete. ■Tip If you’re a fan of Live365 (www.live365.com), you should find that the .pls file downloads auto- matically when you click the Play button alongside a radio station in the web site listing. The site will also open a playback browser window, which, if you have the correct audio codecs installed, will start playing the station. You can simply close this playback window. Listening to Podcasts Podcasts are audio files that are distributed by RSS (Real Simple Syndication). This sounds complicated, but it’s actually quite simple. It means that, once you’re subscribed to a partic- ular podcast, the audio files are downloaded automatically in the background, so that the latest episodes will always be available. This makes keeping up with the latest episodes effortless. Most podcasts take the form of MP3 files, but any audio file format can be used. In terms of content, podcasts range from simple spoken blog entries, usually created by individuals, to podcasts that are more akin to radio shows and involve interviews. Some professional radio stations even release entire shows as podcasts, with the British Broadcasting Corporation (BBC) leading the charge (www.bbc.co.uk/radio/podcasts/ directory/).
- 439. CHAPTER 18 ■ DIGITAL A UDIO 403 Rhythmbox is able to handle podcast subscriptions under Ubuntu, and you can add a new subscription by clicking the Podcasts heading in the leftmost pane of Rhythmbox. Then right-click a blank spot in the track listing area, select New Podcast Feed, and enter the URL. However, a much easier way of adding a podcast is to use Firefox to browse to the link. Conveniently, Rhythmbox is fully compatible with the iTunes podcast format, which is perhaps the most prevalent podcast format at the present time. However, some addi- tional work must be done to make Rhythmbox use the link: 1. On the web page where the link is located, click the subscribe link for iTunes users. The nature of this link will vary from page to page. 2. You’ll be invited to choose an application in which to play the podcast. Click the Choose button. 3. In the file browsing dialog box, press Ctrl+L and type /usr/bin/rhythmbox into the Location box (or simply navigate to the location). 4. Click OK in the file dialog box, put a check in the box alongside Remember My Choice for itms Links, and then click OK in the Firefox dialog box. The podcast will then begin downloading in Rhythmbox. If you want to download a particular episode, right-click it and select Download Episode. ■Tip You can start listening to a podcast before it has completely downloaded. If only an RSS link is provided for the podcast (usually indicated on a web site by the orange RSS button), once you click it, Firefox will offer to subscribe to the link itself. You don’t want this to happen, so click the drop-down link alongside Subscribe to This Podcast Using, click Choose Application, and follow the previous instructions to browse to /usr/bin/rhythmbox, as shown in Figure 18-3. Put a check in the box alongside Always Use Rhythmbox to Subscribe to Podcasts, and then click Subscribe Now in the Firefox program window. ■Note Rather strangely, in our tests, some podcasts appeared under the Radio list in Rhythmbox. If the podcast appears to get lost when you’re importing it, be sure to check there first.
- 440. 404 CHAPTER 18 ■ DIGITAL A UDIO Figure 18-3. The best way to subscribe to a podcast is to select it within Firefox and then choose to subscribe using Rhythmbox. Listening to Audio CDs Playing back audio CDs is simple. Just insert the CD, and you should find that Rhythmbox starts automatically. Click the name of the CD in the leftmost pane (look under the Devices heading), and then click the Play button on the toolbar. If you prefer, you can listen to audio CDs using Sound Juicer instead. Simply close Rhythmbox, and then start Sound Juicer (Applications ➤ Sound & Video ➤ Audio CD Extractor). Figure 18-4 shows the same audio CD in Sound Juicer and Rhythmbox. In both Sound Juicer and Rhythmbox, provided you’re online, the track and artist information will be looked up online, so you should find a complete listing. To start playing the CD in either application, simply click the Play button. This is located at the bottom of the window in Sound Juicer and the top of the window in Rhythmbox. Both applications also offer a slider by which you can cue backward and forward in the track by clicking and dragging. To eject the disk, press the button on the front of the drive. If this doesn’t work, right- click the Audio CD desktop icon and select Eject.
- 441. CHAPTER 18 ■ DIGITAL A UDIO 405 ■Tip As with all GNOME applications, hover the mouse cursor over each button to display a tooltip that describes what it does. If you find the track listing information is incorrect, as can sometimes happen with online lookups, you can correct it within Sound Juicer by slowly double-clicking the track name—click once and then, half a second later, click again (a little like renaming files within Windows/Mac). Then type the new name. To rename a track in Rhythmbox, right- click the track and select Properties. Under Sound Juicer, you can then submit the revised track names to the online database by clicking Disc ➤ Submit Track Names. Figure 18-4. Sound Juicer and Rhythmbox offer simple but effective CD playback, and both look up artist and track information online. Ripping Music from CDs Converting audio tracks on a CD into digital music files you can store on your hard disk for personal use is informally known as ripping. It’s handled under Ubuntu using the Sound Juicer application (Applications ➤ Sound & Video ➤ Audio CD Extractor).
- 442. 406 CHAPTER 18 ■ DIGITAL A UDIO ■Note Because of the way audio CDs work, you can’t simply insert the disc and then drag-and-drop the tracks onto your hard disk. They must be converted first. Before you start to rip CDs, however, you’ll need to decide the format in which you wish to store the audio files. Choosing a Format You have several basic choices for audio file formats, the main ones being Ogg Vorbis, FLAC, and MP3. Let’s look at what each has to offer. Ogg Vorbis: This is the Free Software alternative to MP3. Unless you have a trained ear, you won’t be able to tell the difference between a Vorbis and MP3 file (if you do have a trained ear, then you may find Vorbis better!). The two technologies generate files of around the same size, an average of 4MB to 5MB per song. The advantage of Vorbis is that it’s completely open-source technology, so you there isn’t the ethical burden of using patented MP3 software and, therefore, working against the interests of the open-source software movement. The downside of Vorbis is that not many portable audio players support it (although this situation is slowly changing), and other operating systems like Windows won’t be able to play back Vorbis files unless some additional software is installed (see www.vorbis.com/setup). Therefore, Vorbis is perhaps best if you’re ripping files solely for use on your computer. FLAC: This stands for Free Lossless Audio Codec, and it’s the choice of the audiophile. Vorbis and MP3 are lossy formats, which means that some of the audio data is lost in order to significantly shrink the file. FLAC doesn’t lose any audio data but still manages to compress files to a certain degree (although they’re still much larger than an equiv- alent MP3 or Ogg file). FLAC scores points because it’s open source, like Vorbis, but you’ll face the same lack of support in portable audio players and other operating systems (unless additional software is installed; see http://flac.sourceforge.net). Speex: Originally designed purely for Voice over IP (VoIP), Speex was created for speech encoding. As such, it concentrates on audio frequencies generated during ordinary conversation. Aside from the fact that Speex is an open-source codec that claims to not employ any patented software methods, there really isn’t any reason to use it, even if you’re ripping speech tracks from a CD. It is built for transmission across low-bandwidth connections (or small file sizes). If hard disk capacity is an issue, then you might consider it, but Ogg and MP3 are better suited in virtually all situations. The Speex file extension is .spx.
- 443. CHAPTER 18 ■ DIGITAL A UDIO 407 WAV: This is perhaps the oldest audio file format. It uses the .wav file extension, which you may have seen in use on Microsoft Windows computers. WAV files are usually completely uncompressed and lossless. However, that doesn’t necessarily mean they’re high quality; as with any kind of audio encoding, the sampling and bit rate can be set to any value desired. For example, Ubuntu includes a default .wav encoding profile of low quality that can be used when encoding speech. Although WAV files tend to be supported on most computing platforms, the downside is file size. Uncompressed WAV files can be massive, even those with low-quality settings. If uncompressed audio is your aim, FLAC offers a far better alternative. MP3: This is by far the most ubiquitous music file format, and practically everyone who owns a computer has at least a handful of MP3 tracks. This means software support for MP3 playback is strong, and of course, portable audio players are built around the MP3 standard. The only problem for you, as a Linux user, is the issue of surrounding patents, as explained at the beginning of this chapter. Using the MP3 format goes against a lot of what the Linux and open source movement stands for. But in the end, the choice is yours. Adding MP3-Ripping Support to Sound Juicer Support for Ogg and FLAC is built into Sound Juicer, but if you wish to encode CD tracks as MP3s, you’ll need to enter some configuration details into Sound Juicer. You’ll also need to manually install the gstreamer0.10-plugins-ugly-multiverse software package, which includes the necessary encoding codecs. Follow these steps to configure MP3 encoding support and set MP3 as the default encoding format: 1. Open the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager) and then click the Search button. 2. In the Search dialog box, enter gstreamer ugly multiverse. Then click the dialog box’s Search button. 3. In the list of results, look for something like gstreamer0.10-plugins-ugly-multiverse (ensure you don’t get it mixed up with the similar package that has –dbg at the end; note that the version number in the middle of the file might be different). Click the check box alongside it and click Mark for Installation. You’ll be told that additional files need to be installed. This is fine. Click Apply on the main toolbar. 4. Once Synaptic has finished installation, close the program. 5. Select Applications ➤ Sound & Video ➤ Audio CD Extractor to start Sound Juicer.
- 444. 408 CHAPTER 18 ■ DIGITAL A UDIO 6. Click Edit ➤ Preferences. In the Preferences dialog box, click the Output Format drop-down list and select CD Quality, MP3 (MP3 audio). 7. Click the Close button. Sound Juicer is now set up to rip CDs to MP3 format by default. Ripping Tracks When you’re ready to rip some music, insert the audio CD, and then start Sound Juicer. If the CD isn’t read immediately, click Disc ➤ Re-read Disc. Click Edit ➤ Preferences. In the Format part of the dialog box, choose the type of audio files you want to create: Ogg Vorbis, FLAC, or MP3 (if you’ve followed the instructions in the previous section to install the gstreamer0.10-plugins-ugly-multiverse package). In addition, you can select where you would like the files to be saved by clicking the drop-down list under the Music Folder heading. Click the Close button after setting your preferences. ■Note Audio tracks will be saved in a directory named after the artist and in a subdirectory named after the album title. Back in the main Sound Juicer window, any track in the listing with a check in its box will be ripped. When you insert a CD, Sound Juicer assumes that all the tracks are to be ripped. If this isn’t the case, remove the checks from the tracks you don’t want to rip, as shown in Figure 18-5. By selecting a track and clicking the Play button, you’ll be able to audition it. This can be helpful if you’re deciding on exactly which tracks to rip. Finally, check that the Title and Artist information is correct. To begin the ripping process, click the Extract button. It can take up to a minute or so to rip each track, so ripping an entire CD may take some time. However, it’s safe to leave Sound Juicer working in the background. ■Tip You can also use Rhythmbox to rip tracks. Simply select the CD in the leftmost pane and click Copy to Library from the toolbar. To change the file format (Vorbis, MP3, and so on), click Edit ➤ Preferences, click the Music tab in the Preferences dialog box, and select a format from the Preferred Format drop-down list. By default, the files will saved in the Music folder in your home directory, but you can change the location by updating the Library Location setting on the Music tab of the Preferences dialog box.
- 445. CHAPTER 18 ■ DIGITAL A UDIO 409 Figure 18-5. Audio tracks can be ripped from CDs using the Sound Juicer program. MAKING MUSIC AND RECORDING AUDIO Most PCs come with sound cards that are capable of making music. You can use many open-source programs, designed for both amateurs and professionals alike, to create music or record and edit audio. In terms of musical sequencers, MusE (www.muse-sequencer.org), Rosegarden (www.rosegardenmusic.com), and Jazz++ (jazzplusplus.sourceforge.net) are well worth investigating. Like all modern MIDI sequencers, these programs let you record audio tracks, effectively turning your PC into a recording studio. It’s also possible to run virtual synthesizers on your PC, which effectively turn even the most basic sound card into a powerful musical instrument. Examples include Bristol (https://sourceforge.net/ projects/bristol) and FluidSynth (http://fluidsynth.resonance.org/trac). If you’re interested in only audio recording and processing, Sweep (www.metadecks.org) and Audacity (http://audacity.sourceforge.net) are worth a look. In addition to audio recording and playback, both feature graphical waveform editing and powerful filters. Most of the packages mentioned here are available from the Ubuntu software repositories, and you can download them with the Synaptic Package Manager. Creating Your Own CDs You can create audio CDs using Brasero, which aims to be a complete CD-burning suite, like Nero under Microsoft Windows.
- 446. 410 CHAPTER 18 ■ DIGITAL A UDIO Start by inserting a blank CD. By default, Nautilus’s CD/DVD Creator will automatically run. Close that window, and then start Brasero by clicking Applications ➤ Sound & Video ➤ Brasero Disc Creator. ■Tip If you want Brasero to open each time you insert a blank CD, right-click the CD icon on the desktop and select Open with Brasero Disc Burning. When you’re prompted to decide whether Brasero should be the default application for burning data discs, click Yes. When Brasero’s main window appears, it will by start with a new Data project, by default. To create an audio CD, click the Audio Project button (or click Project ➤ New Project ➤ New Audio Project). The program is very simple to use: 1. On the left side of the main window, browse to your store of files. These can be Ogg, FLAC, or MP3 files (if you installed the MP3 playback software, as described in the “Installing Codecs” section earlier in this chapter). Note that the Fluendo codec will also work for burning CDs from MP3 tracks. 2. Select the tracks you wish to go onto the CD. As with Windows, Shift-click to select many contiguous tracks at once, or Ctrl-click to choose multiple individual tracks. Drag-and-drop the selected tracks onto the right portion of the main window. 3. You’ll see the track listing build up in the window where you dropped the selected tracks. In addition, a bar at the bottom of the program window will fill up, showing how much space is left on the CD. If desired, rearrange the track listing by clicking and dragging the tracks to new locations. 4. When you’re satisfied with the track listing, click the Burn button to prepare your disc for burning. 5. In the Disc Burning Setup dialog box, click the Burn button to start the write pro- cedure. First, the tracks are converted to pure audio files, and then they’re actually burned to disc, as shown in Figure 18-6. This can take some time. When Brasero finishes with the burning, the CD will be ejected. ■Note Depending on the quality of the blank CD, you might not be able to write audio CDs at full speed. If this is the case, Brasero will stop during the writing process with an error message. You’ll need to adjust the burn speed. To do so, in the Disc Burning Setup dialog box, click the Properties button and choose a more conservative speed from the Burning Speed drop-down list.
- 447. CHAPTER 18 ■ DIGITAL A UDIO 411 Figure 18-6. Brasero makes it easy to create CDs from digital audio files. Installing Skype Skype is used by millions of people around the world to make Internet telephone calls via VoIP. This is a complicated way of saying that voice calls are transmitted across the Internet. Using Skype, it’s possible to call other Skype users for free, or to call various phone numbers around the world, usually for a small charge. Installing Skype is easy, and the Skype developers have even created a software repository from which it can be installed. This means that you’ll be informed via Update Manager whenever a new version of Skype becomes available. To add the Skype repository, click System ➤ Administration ➤ Software Sources. Click the Third-Party Software tab in the window that appears, and then click the Add button. In the APT Line text box, type the following: deb http://download.skype.com/linux/repos/debian/ stable non-free Note the spaces between debian/ and stable and between stable and non-free. Click the Add Source button. Click Close, and then click the Reload button in the dialog box that appears. To install Skype, open the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager). Click Search, type skype into the search box, and click Search. In the list of results, put a check alongside the entry, and click Mark for Installation. You’ll see an error message about Skype not being authenticated and that an additional package needs to be installed, but this is acceptable, so click the Mark button on the dialog box. Then click Apply on the toolbar to install the software. Once the software has installed, click Applications ➤ Internet ➤ Skype to start it. Using Skype under Linux is almost exactly the same as using the same program under Windows or Macintosh (without the SMS or texting feature), as shown in Figure 18-7. You’ll find excellent documentation at www.skype.com.
- 448. 412 CHAPTER 18 ■ DIGITAL A UDIO ■Tip To configure your audio input devices, such as a microphone, right-click the Speaker icon at the top- right of the desktop and select Open Volume Control. Then click and drag the Microphone slider as necessary. You may need to unmute the input by removing the red cross next to the speaker icon below the microphone sliders. Figure 18-7. It’s easy to install Skype under Ubuntu, and it works in almost exactly the same way as it does under Windows or Macintosh. Summary This chapter has covered the audio functions built into Ubuntu and shown how, by down- loading a few extra system files, you can play back the majority of audio files in existence. We started by discussing the moral and legal dilemmas associated with multimedia play- back on a computer. Then we moved on to look at how to install the necessary codec files on your computer, before discussing how you can listen to music files, CDs, and online radio stations. We examined how you can convert CDs into music files, and then the inverse of this: how you can create CDs using audio files. Finally, we examined how you can install Skype on your computer. In Chapter 19, we’ll look at playing back movies and online animations using Ubuntu.
- 449. CHAPTER 19 ■■■ Movies and Multimedia M ovie playback is becoming increasingly popular on computers. Modern PCs come equipped with DVD-ROM drives, which, coupled with the right software, can play DVD movie discs. In addition, many web sites feature streaming movie clips or offer them for download. Ubuntu provides support for movie playback. As with audio playback (discussed in the previous chapter), you’ll need to install additional codecs. And just as with audio playback codecs, multimedia applications suggest which movie playback codecs to download and install when you attempt to play unsupported multimedia files. This chapter explains how easy it is to set up Ubuntu for watching videos, DVDs, and TV on your computer, as well as playing web site Flash animations and videos. Installing Playback Software Like the other multimedia software provided with Ubuntu, its video playback application, Totem Movie Player, is basic but effective and does the job well. However, because of patenting issues, Totem doesn’t support all video formats out of the box. In fact, it supports very few of those you might be used to using under Windows or Macintosh. If you wish to play back the most common video files, such as those listed in Table 19-1, you must install additional software. Video and audio playback within the Firefox web browser are handled via the Totem browser plug-in, in exactly the same way as the Windows Media Player and QuickTime browser plug-ins work under Windows. This is set up automatically during initial installa- tion of Ubuntu and is also compatible with the GStreamer codec plug-ins once they are installed. However, when you try to retrieve streaming content, many web sites attempt to probe your setup to ensure you have the required media player software, and they balk when unable to find Windows Media Player or QuickTime. This makes playback difficult, although more and more sites are switching to video playback via Flash Player. Addition- ally, some web sites use Java applets to present content. You can install support for both Flash and Java through Firefox. 413
- 450. 414 CHAPTER 19 ■ MOVIES AND MULTIMEDIA Table 19-1. Popular Movie File Formats Format Typical File Web Site Notes Extensions Windows .wmv, .wma, www.microsoft.com/ Windows Media Player format is the default Media Player 9 .asx, .asf windows/windowsmedia for most Windows users. Although it’s possible to play Windows Media Player files under Ubuntu (files in WMP1, WMP2, and WMP3 formats), you won’t be able to play DRM- restricted files (those that rely on the down- load and installation of a certificate), such as those from the increasing number of movie rental sites. Real Video .rm, .ram www.real.com By downloading the GStreamer plug-in package when prompted, you can play back Real Video files in Totem. However, you can also download a Linux version of RealPlayer. QuickTime .mov, .qt www.quicktime.com QuickTime is Apple’s default media format and has gained ground on both Windows and Macintosh computers. As with Windows Media Player file playback, you won’t be able to play DRM-restricted files. DivX .avi, .divx www.divx.com The DivX format is one of the most popular formats for those in the Internet community who like to encode their own movies. It’s renowned for its ability to shrink movies to very small sizes. Here, we will cover how to install codecs for movie file formats, as well as how to install the Linux version of RealPlayer and support for Flash and Java. Installing Codecs The codecs for video playback are created by the open-source community and are there- fore entirely free of copyright issues, but it is claimed some utilize patented technology. As you might expect, this makes for another legally gray area. It’s unlikely that the patent holders sanction the distribution of the codecs in countries that allow software to be patented. As with audio playback codecs, you will need to decide whether the caveats shown by Ubuntu during the installation of the codecs apply to you.
- 451. CHAPTER 19 ■ MOVIES AND MULTIMEDIA 415 ■Note Most of the movie playback codecs used under Ubuntu are provided by the excellent FFmpeg Project (http://ffmpeg.mplayerhq.hu/). This is part of the MPlayer Project, which aims to create an open-source media player and platform, separate from GStreamer or Xine (used under the GNOME and KDE desktops, respectively). However, as with all open-source projects, it is both possible and encouraged to take and reuse just the FFmpeg codec software, which is what the Ubuntu developers have done to bring support for a wide range of movie and audio formats to Ubuntu. As stated earlier, codec installation for new file formats is automated, just as with audio codecs. In fact, if you followed the instructions to install the MP3 codecs in the previous chapter, including the GStreamer ffmpeg video plugin codec, then your system may already have support for the movie formats. In that case, the video file you’ve chosen to view will just start playing—you won’t be prompted to download anything extra. Here is the procedure for adding codecs to play a multimedia file: 1. From Nautilus, double-click a movie file. 2. The Totem Movie Player application will start and prompt you to search for a suitable codec. (As noted, the movie will just start playing if you already have the necessary codec.) Click the Search button. 3. Ubuntu will search for the applicable codec. Once it has finished searching, the Install Multimedia Codecs dialog box will appear, prompting you to select from the list of codecs. 4. You can read through the descriptions to know which codec to choose, if more than one is offered. As with audio playback codecs, it’s usually a good idea to select all of the codecs offered, to get the broadest range of support. Ubuntu will handle any functionality overlap in the background, so don’t worry about installing two or more sets of codecs that seemingly do the same job. Check the options you want and click the Install button. 5. Ubuntu will ask you to confirm the installation of restricted software. Read through the conditions and warnings. If you want to continue, click Confirm. Otherwise, click the Cancel button to choose not to install the codec (meaning that your system will not be able to play the files). 6. Back in the Install Multimedia Codecs dialog box, click the Install button again.
- 452. 416 CHAPTER 19 ■ MOVIES AND MULTIMEDIA 7. Supply your password in the authorization dialog box and click OK to proceed with the installation. 8. Ubuntu will download and install the packages. Once you have been notified that the packages have been installed successfully, click the Close button. At this point, your multimedia file will play in Totem. ■Tip When trying to play back QuickTime movies in our tests, we found that a reboot was necessary after the codec was installed. If Totem once again asks you to install the codec when you try to play a QuickTime movie, just click the Cancel button and then reboot. This is probably because QuickTime support is provided by codecs that are still in the process of being developed and can be a little buggy. But after a reboot, you should find that QuickTime movies play back perfectly. Installing RealPlayer Installing RealPlayer involves adding a new software repository and then using the Synaptic Package Manager to download and install RealPlayer. The software repository is hosted by Canonical, the company that’s the chief sponsor and director of Ubuntu, as a method of providing some useful proprietary extra software. We explain software installa- tion in Chapter 28, but for the moment, it is enough to follow these instructions: 1. Click System ➤ Administration ➤ Software Sources. 2. When the Software Sources window appears, click the Third-Party Software tab. 3. Put a check alongside the first entry in the list, which should read http:// archive.canonical.com/ubuntu hardy partner. Then click Close. 4. You will see a dialog box informing you that the information about available software is out-of-date. Click the Reload button. Once this has completed, the Software Sources dialog box will close automatically. 5. Open the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager) and click the Search button. Search for realplay. In the list of results, click the check box alongside the package, and click Mark for Installation. Click the Apply button on the toolbar. Close Synaptic. 6. Click Applications ➤ Sound and Video ➤ RealPlayer 10 to start the RealPlayer setup program. Click the Forward button several times to move through the license agreement and information screens.
- 453. CHAPTER 19 ■ MOVIES AND MULTIMEDIA 417 7. Eventually, you’ll be asked if you want to check for updates and configure Mozilla helpers, as shown in Figure 19-1. Ensure both boxes are checked and click OK. Figure 19-1. After RealPlayer has been installed by a self-installer executable, you must run through its setup program to install the browser plug-in. 8. RealPlayer will start. You can use it or close it. ■Tip To see which plug-ins are installed under Firefox, type about:plugins in the address bar. Adding Flash Support Flash is a multimedia plug-in used for animations, games, and even video playback on web sites. It is a standard requirement on modern Internet-equipped computers, and it’s becoming hard to find commercial sites that don’t utilize it in some way. For example, YouTube (www.youtube.com) uses Flash for the playback of video files, as shown in Figure 19-2. Adobe is the originator of the Flash technology and makes a version of its proprietary Flash Player web browser plug-in especially for Linux, which can be easily installed under Ubuntu. You can also select to install one of two open-source Flash players: Swfdec or Gnash. Of the three, Adobe’s own Flash Player offers best all-round compatibility with web sites of all kinds—general, video, games, and animations. Swfdec is perhaps the best open-source choice, although it specializes primarily in video playback, such as that offered by YouTube or the BBC (www.bbc.co.uk). Gnash may be the weakest of the three (at the time this book was written), but might be worth investigating if you prefer to use open- source software and find that Swfdec doesn’t work correctly with your favorite web sites.
- 454. 418 CHAPTER 19 ■ MOVIES AND MULTIMEDIA Figure 19-2. Flash is increasingly popular on video playback sites, such as YouTube. ■Note Sadly, there isn’t a Linux version of the Shockwave Director browser plug-in. If you really need to have access to Shockwave sites under Linux, consider using CrossOver Office (www.codeweavers.com) to install the Windows version. But be aware that CrossOver Office is commercial product, and you’ll need to pay for it. Installing a Flash Plug-in As with multimedia codecs, Flash support is installed on demand and is entirely auto- mated. However, this time, installation takes place from within the Firefox browser, as follows: 1. The first time you visit a web site that uses Flash, a yellow bar will appear at the top of the browser window, informing you that you need to install a missing plug-in. Click the Install Missing Plugins button. 2. In the Plugin Finder Service dialog box, click your choice of plug-in, and then click the Next button.
- 455. CHAPTER 19 ■ MOVIES AND MULTIMEDIA 419 3. You’re asked if you want to install additional software. Click the Yes button. 4. The software is downloaded and installed in the background automatically. Once installation has completed, click the Finish button to close the Plugin Finder Service dialog box. The browser will then display the Flash content. Removing a Flash Plug-in If you wish to remove a Flash plug-in, perhaps because it doesn’t work correctly and you wish to try an alternative, open the Synaptic Package Manager (System ➤ Administration) and search for the package: gnash to remove Gnash, swfdec, to remove Swfdec, or flashplugin-nonfree to remove Adobe’s Flash Player. Click the check box alongside the entry in the list and select Mark for Removal from the menu that appears. (If you wish to remove Gnash, you’ll need to mark both gnash and gnash-common for removal.) Then click Apply on the main toolbar. Close Synaptic when the removal is complete. Following this, whenever you visit a site requiring Flash, you will again be prompted to install a Flash plug-in. You can then select a different option from the list. Adding Java Support Java is a software platform that some programs use. The intention is that Java is cross- platform, which means that software developed for, say, Microsoft Windows will also work on Linux and Macintosh. Because of this, some web sites use Java applets—small programs embedded into the web page—to present interaction, animation, and even movies. To access web sites that employ Java applets, you’ll need to install Java Runtime soft- ware along with a browser plug-in. As with Flash plug-ins, the installation of Java (both runtime and plug-in components) is automated and upon demand. Also, as with Flash, you will have more than one option to choose from: the proprietary Sun versions, the open-source GCJ plug-in, and a variation of the GCJ plug-in that uses OpenJDK. For compatibility purposes, the Sun Java Runtime version 6 is perhaps the best choice. If you want to install an open-source runtime and plug-in, at the time of writing, reports indicate that GCJ using the OpenJDK plug-in is the best choice. The OpenJDK runtime is Sun’s implementation of open-source Java runtime software, so it is supported by the originator of Java and comes with the backing of a major corporation (see http:// openjdk.java.net/). As with the Flash plug-in, installation of the Java support is done from Firefox: 1. The first time you visit a web site that uses Java, a yellow bar will appear at the top of the browser window, informing you that you need to install a missing plug-in. Click the Install Missing Plugins button to do so. 2. Select your preferred Java plug-in when prompted and click the Next button. 3. A dialog box prompts you to confirm installing the plug-in. Click Yes.
- 456. 420 CHAPTER 19 ■ MOVIES AND MULTIMEDIA 4. You are prompted for your password, because system changes must be made. Enter your password and click OK. 5. A handful of packages are downloaded. If you opted for the Sun Java Runtime plug- ins, once download has finished, you’re prompted to read and accept the license. Do so, and then click the Forward button. 6. The software is installed and configured automatically. Click the Finish button to finalize the installation once it has completed. 7. When everything is installed, close Firefox and then start it again. Watching Movies The Totem Movie Player application (Applications ➤ Sound and Video ➤ Movie Player) is used to play back video under Ubuntu, as shown in Figure 19-3. Figure 19-3. Totem handles movie file playback under Ubuntu and is simple but effective. To play a movie file on your hard disk, simply double-click its icon. This will automati- cally start Totem and play the video, if Totem has the appropriate codecs, as shown in
- 457. CHAPTER 19 ■ MOVIES AND MULTIMEDIA 421 Figure 19-4. If not, Totem will suggest which codecs to download and install, as explained earlier in the chapter. ■Tip By default, all video files will play in Totem, including RealMedia. To change this so that RealPlayer handles its own file types, right-click any RealPlayer movie file, select Properties, click the Open With tab, and click Add. Locate RealPlayer in the list, click the Add button, and then make sure the radio button alongside RealPlayer is selected. Figure 19-4. Totem can play just about every kind of movie file, such as QuickTime, Windows Media Player, or DivX, as here. Using Totem is easy, and the interface has only a handful of options. At the bottom-left of the screen are the transport controls that allow you to pause, play, and move forward and backward in the video file. Alternatively, you can right-click the video window and select the controls from there. Above the controls is the Time bar. You can drag the slider to move through the video, but not all files support this function. You might find that some dragging is allowed, but you’re not able to click a new place in the Time bar and have the counter jump to that position.
- 458. 422 CHAPTER 19 ■ MOVIES AND MULTIMEDIA At the right of the program window is a playlist. You can queue several video files to be played in sequence by simply dragging and dropping movies from a Nautilus file browser window. You can hide the playlist by clicking the Sidebar button. This gives nearly all of Totem’s program window to the playback window. To play the video full screen, thereby hiding the desktop and Totem controls, press the F key. To return to the program window, press Esc (or press F again). In full-screen mode, you can start and stop the video by pressing the spacebar. To adjust the image quality, click Edit ➤ Preferences, and then click the Display tab in the Preferences dialog box. You can make adjustments by clicking and dragging the Bright- ness, Contrast, Saturation, and Hue sliders. If a video is playing in the background, the changes will be shown as you make them. ■Tip If you find you have problems with video playback, such as Totem showing an error message about another application using the video output, try the following: click System ➤ Preferences ➤ Terminal, and at the prompt, type gstreamer-properties. Click the Video tab, and in the Plugin drop-down list under Default Output, select Xwindows (No XV). OPEN-SOURCE MOVIE FILE FORMATS A number of promising open-source movie file formats are in development. Some are more mature than others, but few see widespread use at the moment. All promise much for the future. Many consider the following three formats the chief contenders: • Xvid (www.xvid.org) is a reworking of the popular DivX MPEG-4-based file format. Unfortunately, Xvid uses technology covered by patents in some parts of the world, so the project exists in a legally gray area. Xvid is able to encode movies to relatively small files sizes (a 90-minute movie can fit on a CD). Despite small file sizes, it can maintain good image and sound quality. In theory, it should also be possible to play Xvid movies using any MPEG-4 codec, such as DivX or QuickTime. • Ogg Theora (www.theora.org) is being developed by the Xiph.org Foundation, the people behind the Ogg Vorbis audio codec project that’s a favorite among Linux users. As such, it promises to be a completely open-source project. Although the technology is covered by patents, Xiph.org has promised never to enforce them, meaning that anyone in the world can use Theora without charge. At the time of this writing, Theora has been released as a beta, but it will almost certainly become the open-source video codec of choice in the future. • The British Broadcasting Corporation (www.bbc.co.uk), the UK’s largest public service broadcaster, is sponsoring development of the Dirac codec (see http://schrodinger.sourceforge.net). Dirac is less developed than both Theora and Xvid at present, and it is aimed more at the broadcast/enthusiast market. For example, it is designed to support high-definition TV. However, it’s certainly one to watch.
- 459. CHAPTER 19 ■ MOVIES AND MULTIMEDIA 423 Watching DVDs As explained in Chapter 18, DVD movie discs are protected by a form of DRM called CSS. This forces anyone who would like to create DVD playback software or hardware to pay a fee to the DVD Copy Control Association, an industry organization set up to protect DVD movie technology. Nearly all Linux advocates are scornful of any kind of DRM system. It isn’t possible to buy stand-alone licensed DVD playback software for Linux, but even if it were, few would be willing to support what they see as prohibitive software technology. Some open-source advocates reverse-engineered DVD protection and came up with the DeCSS software. This bypasses the CSS system and allows the playback of DVD movies under practically any operating system. Sadly, DeCSS is caught in a legal quagmire. The Motion Picture Association of America (MPAA) has attempted to stop its distribution within the United States but has failed. Some experts suggest that distributing DeCSS breaks copyright laws, but there has yet to be a case anywhere in the world that proves this. Nor has there been a case proving or even suggesting that using DeCSS is in any way illegal. Ubuntu doesn’t come with DeCSS installed by default, but you can download and install the software by issuing a simple command, following the installation of a software package. Here is the procedure: 1. Select System ➤ Administration ➤ Synaptic Package Manager. 2. Click Search, and search for libdvdread3. In the list of results, click the check box alongside the package and click Mark for Installation. Click Apply on the main toolbar. Close Synaptic. 3. Open a terminal window (Applications ➤ Accessories ➤ Terminal). Type the following in the terminal window to download and install the DeCSS component: sudo /usr/share/doc/libdvdread3/install-css.sh 4. Once the command has completed, you can close the terminal window. ■Note You must ensure Synaptic and also Update Manager are closed before typing the command to install the DeCSS software. It will fail if either program is running. After you’ve installed DeCSS, just insert a DVD, and Totem will automatically start playing it, as shown in Figure 19-5.
- 460. 424 CHAPTER 19 ■ MOVIES AND MULTIMEDIA ■Note If the relevant codecs aren’t installed when you insert a DVD, you will be prompted to install them, as with all kinds of multimedia file playback. Figure 19-5. Just insert a DVD in your computer, and it will automatically play in Totem. If the movie doesn’t start playing automatically, double-click the disc’s icon on the desktop. In the Nautilus file browser window, click the Open Movie Player button. Unfortunately, there is a slight limitation to playing DVD movies within Totem: the chapter menu will not work, so you will not be able to navigate from chapter to chapter in the disc. Additionally, in our tests, we noticed that DVD playback could be a little glitchy. To get around both these issues, you can install the totem-xine package. This installs a separate but otherwise identical version of the Totem Movie Player that utilizes the Xine multimedia framework (Chapter 18 explains what a multimedia framework is). Then you will be able to choose between using the standard version of Totem, which relies on the GStreamer multimedia framework, or the Xine version of Totem. Installing the totem-xine package also installs Xine versions of the codecs you need for virtually all multimedia file playback, meaning no extra configuration is necessary.
- 461. CHAPTER 19 ■ MOVIES AND MULTIMEDIA 425 ■Note You might be wondering why we didn’t just advise you to install totem-xine back at the beginning of this chapter, if it installs all the codecs you need. The method we recommend installs codecs for the GStreamer multimedia framework, rather than just Totem. GStreamer is used by all of the GNOME desktop multimedia software. This means that if you install a different GNOME movie player in the future, it will auto- matically have support for all the file formats you’ve already added to Ubuntu. In contrast, the totem-xine package is rather self-contained and installs codecs for only the Xine framework, which isn’t supported else- where under Ubuntu (but is the default framework under KDE). To install the totem-xine package, start the Synaptic Package Manager (System ➤ Administration) and click the Search button. Search for totem-xine. Click the check box alongside the entry in the results list and select to install it. As you’ll see from the warning dialog box, installing totem-xine also installs a lot of other packages, including the neces- sary codecs for playback of virtually all multimedia files. This is fine. From now on, you’ll need to run the Xine version of Totem to play DVD movies. You’ll have to do this before you insert the DVD movie disc, to avoid the standard version of Totem attempting to play it. To run the Xine version of Totem, you can use either of these methods: Run it from a terminal window: Click Applications ➤ Accessories ➤ Terminal and type nohup totem-xine. Create a new launcher: Right-click the desktop, select Create Launcher, and in the Command text box, type totem-xine. In the Name box, type something like Totem (Xine) for easy identification, and then click OK. ■Tip To find out which version of Totem you’re using—GStreamer or Xine—click Help ➤ About in Totem. You’ll see either “Movie Player using xine-lib,” in the case of Xine, or “Movie Player using GStreamer,” in the case of GStreamer. MOVIE EDITING The field of Linux movie-editing software is developing, and only a handful of programs are available for the nonprofessional user. One of the best is Kino (www.kinodv.org), which is available in the Ubuntu software archives. Although far from being a professional-level program, Kino allows competent users to import and edit videos, apply effects, and then output in either MPEG-1 or MPEG-2 format. If you’re looking for something more powerful, but also more complicated, then Cinelerra is worth a look (http://heroinewarrior.com/cinelerra.php3). Just follow the instructions at http:// cvs.cinelerra.org/getting_cinelerra.php#hardy to install a version of Cinelerra for Ubuntu. Incidentally, professional moviemakers use Linux all the time, particularly when it comes to adding special effects to movies. Movies like Shrek 2, Stuart Little, and the Harry Potter series all benefited from the CinePaint software running under Linux! For more details, see www.cinepaint.org.
- 462. 426 CHAPTER 19 ■ MOVIES AND MULTIMEDIA Watching TV If you have a TV card, you may be able to use it to watch TV under Ubuntu. Ubuntu doesn’t come with a TV tuner application by default, but you can download the tvtime program from the software repositories using the Synaptic Package Manager. Checking for Video Input Ubuntu includes the Video for Linux project, an extension to the Linux kernel to allow many popular TV and video-capture cards to work. You can find out if yours is compatible by opening a terminal window (Applications ➤ Accessories ➤ Terminal) and typing gstreamer-properties. In the dialog box that appears, click the Video tab, and click the Test button in the Default Input part of the window. If you see a video window without an error message, then your TV card is compatible. If you receive an error message, then your card probably isn’t compatible. ■Note Getting Video for Linux to work can be troublesome, but there are a lot of resources out there to help. You can start by visiting www.linuxtv.org and www.exploits.org/v4l/. Installing tvtime To download and install tvtime, open the Synaptic Package Manager (System ➤ Adminis- tration), click the Search button, and enter tvtime as a search term. In the list of results, click the entry for the package, mark it for installation, and then click Apply. When the download has completed, you’ll be asked a number of questions during the configuration process. First, you need to choose your TV picture format. Users in the United States should choose NTSC. Users in the United Kingdom, Australia, and certain parts of Europe should choose PAL. To find out which TV system your country uses, look up your country at www.videouniversity.com/standard.htm. You also need to choose your geographical area from the list so that tvtime can set the correct radio frequency range for your TV card. Once the program is installed, you’ll find it on the Applications ➤ Sound & Video menu. Using the program is straightforward, but if you need guidance, visit the program’s web site at http://tvtime.sourceforge.net.
- 463. CHAPTER 19 ■ MOVIES AND MULTIMEDIA 427 ■Tip If you’re interested in setting up a low-cost personal video recorder (PVR) and entertainment system, you may want to install MythTV using the Synaptic Package Manager. For more information, check out Practical MythTV: Building a PVR and Media Center PC by Stewart Smith and Michael Still (1-59059-779-6; Apress, 2007). Summary In this chapter, we looked how you can watch movies on your PC. You’ve seen how you can update Ubuntu to work with the most popular digital video technologies, such as Windows Media Player and QuickTime. In addition, we looked at how you can view online multimedia such as Flash anima- tions on your computer, and discussed how you can watch TV on your PC. In the next chapter, we take a look at image editing under Ubuntu. You’ll learn about one of the crown jewels of the Linux software scene: GIMP.
- 465. CHAPTER 20 ■■■ Digital Photos T he PC has become an increasingly useful tool in the field of photography. In fact, these days it’s hard to find a professional photographer who doesn’t use a computer in some way, either to download digital camera images or to scan in images taken using traditional film-based cameras. Ubuntu includes several photo manipulation and cataloging tools. Chief among these is a professional-level image-editing program called GIMP (for GNU Image Manipulation Program). This chapter introduces this jewel in the crown of Linux software, but first discusses how to use the F-Spot photo manager software to import and manage your image collection. Downloading and Cataloging Images Before you can undertake any image editing, you need to transfer the images to your PC. Depending on the source of the pictures, there are a variety of methods of doing this, but in nearly every case, the work of importing your photos is handled by F-Spot. But before we cover F-Spot, let’s briefly recap the various methods of transferring images to your PC, some of which were outlined in Chapter 8. Connecting Your Camera Most modern cameras use memory cards to store the pictures. If you have such a model, when you plug the camera into your PC’s USB port, you should find that Ubuntu instantly recognizes it. An icon should appear on the desktop, and double-clicking it should display the memory card’s contents in a Nautilus window. Along the top of the window, you’ll see an orange bar saying “This media contains digital photos” alongside a button marked "Open F-Spot Photo Manager”. Clicking this button will start F-Spot, with which you can copy the images to your hard disk, as explained in the next section. Of course, you can simply copy the pictures to your hard disk manually using Nautilus. 429
- 466. 430 CHAPTER 20 ■ DIGITAL PHOTOS If your camera doesn’t appear to be recognized by Ubuntu, you should consider buying a USB card reader. These devices are typically inexpensive and usually can read a wide variety of card types, making them a useful investment for the future. Some new PCs even come with card readers built in. Most generic card readers should work fine under Linux, as will most new digital cameras. ■Caution Before detaching your camera or removing a photo card, you should right-click the desktop icon and select Unmount Volume. This tells Ubuntu that you’ve finished with the device. Failing to eject in this way could cause data errors. If you’re working with print photos, negative film, or transparencies, you can use a scanner and the XSane program (Applications ➤ Graphics ➤ XSane Image Scanner) to digitize them, as explained in Chapter 8. This works in a virtually identical way to the TWAIN modules supplied with Windows scanners, in that you need to set the resolution in dots per inch (DPI), as well as the color depth. Generally speaking, 300 DPI and 24-bit color should provide an adequate representation of most printed photos. Because of their smaller size, transparency or negative film images will require higher resolutions, in the order of 1,200 or 2,400 DPI. Importing Photos Using F-Spot F-Spot is styled after image-cataloging programs you might have used under Windows or Macintosh, such as iPhoto or Picasa. Once you run F-Spot (Applications ➤ Graphics ➤ F-Spot Photo Manager), or after you click the Open F-Spot Photo Manager button that appears along the top of a Nautilus file browser window when you insert a memory card or attach your digital camera, the F-Spot Import window will appear. (Depending on your configuration, the Import window may appear within a file browser.) The Import window contains a preview of the pictures stored in your camera, the option to tag the pictures, and the target directory where the photos will be copied. By default, all of the pictures are selected. You can deselect and select photos using the standard selection techniques (Ctrl-click or Shift-click). Embedded tags are very useful in filtering and searching for pictures, as discussed in the “Tagging Images” section a little later in the chapter. The default target directory where the photos will be copied is Photos in your home directory, but you can change it to any directory you prefer. To import the pictures from your camera to your hard disk, just click the Import button. F-Spot will import your photos in the target location, in directories named after the year, month, and day the photos were originally taken.
- 467. C HA PTE R 20 ■ DIGITA L PHOTOS 431 Importing pictures from your previous Windows setup is easy. Click File ➤ Import. In the Import window, click the Import Source drop-down list, and then click Select Folder. Using the file browser, navigate to the Windows directory containing your images, and then click OK. (Don’t double-click the directory, because this will cause F-Spot to open the directory in the file browser.) After you’ve selected the folder, F-Spot will present thumbnail previews of the images, and this might take some time. Keep your eye on the orange status bar. Once this reads “Done Loading,” you can click the Import button to import all the images, or Ctrl-click to select photos in the left side of the window, and then click the Import button. As with photos from a camera, by default, F-Spot copies the images into a directory it creates within your /home directory, called Photos. Therefore, once you’ve imported the photos, you can delete the originals from the Windows partition if you wish. ■Tip The Import window can be resized by clicking and dragging its edges. This can be very useful when importing many photographs at one time. Once the photos have been imported, the main F-Spot window will appear. On the left are the default tags. On the right is the picture preview window, which can be set to either Browse or Edit Photo mode. You can switch between these two modes using the buttons on the toolbar. You can also view an image full screen or start a slide show that will cycle through the images in sequence. Above the picture window is the timeline. By clicking and dragging the slider, you can move backward and forward in the photograph collection, depending on when the pictures were taken. Each notch on the timeline represents a month within the year marked beneath the timeline. The graphs on the timeline give a general idea of how many photographs were taken during that particular month (or, indeed, if any were taken during a particular month). Tweaking Photos By either double-clicking an image or selecting an image and clicking Edit Photo on the toolbar, you can tweak images by cropping them, adjusting brightness and contrast, or setting the color saturation/balance. In addition, you can convert images to black and white or sepia tone, and you can remove red-eye caused by an indoor flash. All of this can be achieved by clicking the buttons under the image. (Hovering the mouse cursor over an icon will cause a tooltip to appear, explaining what the button does.) Changes to the image are made live, as shown in Figure 20-1, so it’s a good idea to drag the dialog box out of the way to allow full viewing of the image underneath.
- 468. 432 CHAPTER 20 ■ DIGITAL PHOTOS Figure 20-1. Any edits to the image are made live, so it’s a good idea to move the adjustment dialog box out of the way. You can also add a comment in the text field below the image. This will then be attached to the image for future reference, and can act as a useful memory aid. A note of caution is required when tweaking images with F-Spot. Once changes have been made, there doesn’t appear to be any way of undoing them. The Edit menu lacks an Undo option, and pressing Ctrl+Z doesn’t do anything. However, F-Spot keeps a copy of the original image alongside the modified one. To access the original unedited image, click File ➤ Version ➤ Original. ■Tip By clicking File ➤ Create New Version, the currently selected image will be copied and made available on the File ➤ Version menu. You can do this as many times as you want, perhaps to record various image tweaks to choose the best later.
- 469. C HA PTE R 20 ■ DIGITA L PHOTOS 433 Tagging Images F-Spot’s cataloging power comes from its ability to tag each image. A tag is simply a word or short phrase that can be attached to any number of images, rather like a real-life tag that you might find attached to an item in a shop. Once images have been tagged, you can then filter the images using the tag word. For example, you could create a tag called German vacation, which you would attach to all images taken on a trip to Germany. Then, when you select the German vacation tag, only those images will be displayed. Alternatively, you could be more precise with tags—you could create the tags Dusseldorf and Cologne to subdivide pictures taken on the vacation. If your collection involves a lot of pictures taken of your children at various stages during their lives, you could create a tag for each of their names. By selecting to view only photos tagged with a particular child’s name, you could see all the pictures of that child, regardless of when or where they were taken. Images can have more than one tag. A family photo could be tagged with the words thanksgiving, grandma's house, family meal, and the names of the individuals pictured. Then, if you searched using any of the tags, the picture would appear in the list. A handful of tags are provided by default: Favorites, Hidden, People, Places, and Events. To create your own tags, right-click under the tag list on the left of the F-Spot program window and select Create New Tag. Simply type in the name of the new tag in the dialog box and click OK. ■Note Tags can have “parents,” which can help organize them, but we wouldn’t recommend this unless you have a great many tags. Tags can also have icons attached to them. A tag will automatically assign an icon based on the first photo it’s assigned to, but to manually assign a tag an icon, right-click it in the list and select Edit. Next, in the Edit Tag dialog box, click the icon button, and select from the list of icons under the Predefined heading. To attach a tag to a picture, simply right-click it (in either the Browse or Edit Photo mode), and click its entry on Attach Tag. To filter by tag, double-click the tag in the tag list, as shown in Figure 20-2. To remove the filtering, right-click the tag in the orange bar at the top of the display and select Remove from Search.
- 470. 434 CHAPTER 20 ■ DIGITAL PHOTOS Figure 20-2. To filter images by tag, double-click the tag in the list on the left. Image Editing Using GIMP GIMP is an extremely powerful image editor that offers the kind of functions usually associ- ated with top-end software like Adobe Photoshop. Although GIMP is not aimed at beginners, those new to image editing can get a lot from it, provided they put in a little work. The program relies on a few unusual concepts within its interface, which can catch many people off guard. The first of these is that each of the windows within the program, such as floating dialog boxes or palettes, gets its own panel entry. In other words, the GIMP’s icon bar, image window, settings window, and so on have their own buttons on the Ubuntu desktop panel alongside your other programs, as if they were separate programs.
- 471. C HA PTE R 20 ■ DIGITA L PHOTOS 435 ■Note GIMP’s way of working is referred to as a Single Document Interface, or SDI. It’s favored by a handful of programs that run under Linux and seems to be especially popular among programs that let you create things. Because of the way that GIMP runs, before you start up the program, it’s a wise idea to switch to a different virtual desktop (virtual desktops are discussed in Chapter 7), which you can then dedicate entirely to GIMP. Click Applications ➤ Graphics ➤ GNU Image Manipulation Program to run GIMP. You’ll be greeted by what appears to be a complex assortment of program windows. Now you need to be aware of a second unusual aspect of the program: its reliance on right-clicking. Whereas right-clicking usually brings up a context menu offering a handful of options, within GIMP, it’s the principal way of accessing the program’s functions. Right- clicking an image brings up a menu offering access to virtually everything you’ll need while editing. Ubuntu includes the latest version of GIMP, 2.4, and this features a menu bar in the main image-editing window. This is considered sacrilege by many traditional GIMP users, although it’s undoubtedly useful for beginners. However, the right-click menu remains the most efficient way of accessing GIMP’s tools. The main toolbar window, shown in Figure 20-3, is on the left. This can be considered the heart of GIMP, because when you close it, all the other program windows are closed, too. The menu bar on the toolbar window offers most of the options you’re likely to use to start out with GIMP. For example, File ➤ Open will open a browser dialog box in which you can select files to open in GIMP. It’s even possible to create new artwork from scratch by choosing File ➤ New. ■Tip To create vector artwork, a better choice is a program like Inkscape (www.inkscape.org), which can be downloaded via Synaptic Package Manager (to learn about software installation, see Chapter 28). Beneath the menu bar in the main toolbar window are the tools for working with images. Their functions are described in Table 20-1, which lists the tools in order from left to right, starting at the top left.
- 472. 436 CHAPTER 20 ■ DIGITAL PHOTOS Figure 20-3. GIMP’s main toolbar window Table 20-1. GIMP Image-Editing Tools Tool Description of Use Rectangle Select Click and drag to select a rectangular area within the image. This selected area can then be copied and pasted into a different part of the image or turned into a new layer. Ellipse Select Create an oval or circular selection area within the image, which you can then copy and paste. Free Select Click and draw with the mouse to create a hand-drawn selection area. Your selection should end where it started. If not, GIMP will draw a straight line between the start and end of the selection.
- 473. C HA PTE R 20 ■ DIGITA L PHOTOS 437 Table 20-1. GIMP Image-Editing Tools (Continued) Tool Description of Use Fuzzy Select Known as the “magic wand” in other image editors, this tool creates a selection area based on the color of the pixels where you click. For example, clicking a red car hood will select most, if not all of the hood, because it is mostly red. Select by Color Works like the Fuzzy Select tool, but will create a selection across the entire image based on the color you select. In other words, selecting a black T-shirt will also select a black signpost elsewhere in the picture if the hues are similar. Scissors Select Another “magical” tool that lets you create a selection by clicking on various points within an image, with the program joining the points together based on the color differences between the two points. This means that you can select the outline of a car by clicking a few points around the edge of the car and, provided the color of the car is different from the background, GIMP will work out the color differences and select the car’s shape automatically. Foreground Select Lets you automatically create an intricate selection of an object in the foreground of a picture, via a three-step process. Click to draw roughly around the foreground object as with the Free Select tool. (Be careful you don’t stray into the object; if you do, momentarily select a different tool, which will cancel the selection, and try again.) Then release the mouse button and draw across the main areas of the object using a kind of paintbrush tool. For example, if the object is a face, draw a little on the skin and hair. The trick is to cover areas that have different color ranges, because that’s how GIMP detects the edges. You’ll see that the background—the area that won’t be selected—is masked out in blue tint. If any of the foreground object is masked, draw on it to add it to the selection area. You can subtract from the selection area by Ctrl-clicking. Once you’re happy with the selection, hit Enter. Paths Draws Bezier curves in order to create paths, which are akin to selections and can be saved for use later on in the image-editing process. Just click and drag to draw a curve. Each extra click you make will define a new curve, which will be joined to the last one. To turn the path into a selection, click the button at the bottom of the toolbar. Color Picker Lets you see the RGB, HSV, or CMYK values of any color within the image. Simply click the mouse within the image. Zoom Click to zoom into the image, right-click to see various zoom options, and hold down the Alt key while clicking to zoom out. Measure Measures distances between two points (in pixels) and also angles. Just click and drag to use it. The measurements will appear at the bottom of the image window. Move Click and drag to move any selection areas within the image, as well as rearrange the positioning of various layers.
- 474. 438 CHAPTER 20 ■ DIGITAL PHOTOS Table 20-1. GIMP Image-Editing Tools (Continued) Tool Description of Use Alignment Allows you to align layers to other objects relative to each other. To choose a layer, click an object within the preferred layer. To select several layers, Shift-click objects inside the preferred layers. In the tool options of the Alignment tool, select how the layer or layers will be aligned relative to other layers or image objects. Alignment includes left, center horizontal, right, top, center vertical, and bottom, with an option to use offsets as well. Crop Click and drag to define an area of the image to be cropped. Anything outside the selection area you create will be discarded. Rotate Rotates any selections you make and can also rotate entire layers. It opens a dialog box in which you can set the rotation manually. Alternatively, you can simply click and drag the handles behind the dialog box to rotate by hand. Scale Known in some other image editors as “transform,” lets you resize the selection area or layer. It presents a dialog box where you can enter numeric values, or you can click and drag the handles to resize by hand. Shear Lets you transform the image by shearing it. Slant a selection by clicking and dragging the corners of the selection area (if the selection area isn’t square, a rectangular grid will be applied to it for the purposes of transformation). Perspective Lets you transform a selection by clicking and dragging its four corners and independently moving them without affecting the other corners. In this way, a sense of perspective can be emulated. Flip Flips a selection or image so that it is reversed on itself, either horizontally (click) or vertically (Ctrl-click). Text Click the image to add text. Bucket Fill Fills a particular area with solid color or pattern, according to the color or pattern selected in the color box or fill type box below. Blend Creates a gradient fill based on the foreground and background colors. Just click and drag to add the fill. Pencil Lets you draw individual pixels when zoomed in, or hard-edge lines when zoomed out. Simply click and drag to draw freehand, and hold down Shift to draw lines between two points. Paintbrush Lets you draw on the picture in a variety of brush styles to create artistic effects. A brush can also be created from an image, allowing for greater versatility. Erase Rather like the Paintbrush tool in reverse, deletes whatever is underneath the cursor. If layers are being used, the contents of the layer beneath will become visible. Airbrush Like the Paintbrush tool, in that it draws on the picture in a variety of styles. However, the density of the color depends on the length of time you press the mouse button. Tap the mouse button, and only a light color will appear. Press and hold the mouse button, and the color will become more saturated.
- 475. C HA PTE R 20 ■ DIGITA L PHOTOS 439 Table 20-1. GIMP Image-Editing Tools (Continued) Tool Description of Use Ink Like the Paintbrush tool, except that, rather like an ink pen, the faster you draw, the thinner the brushstroke. Clone Allows you to copy one part of an image to another via a brush. The origin point is defined by Ctrl-clicking. Healing Typically used to remove unwanted irregularities, such as pimples, scars, and blemishes in a person’s face. Ctrl-click an ideal source similar to the area that needs to be healed, and then draw over the blemish, which will disappear. Effectively, the Healing tool is a Clone tool that has some intelligence built in to aid intermixing of the sample area and the area you’re drawing over. Perspective Clone Similar to the Clone tool, but also allows you to take into account perspective within the picture. For example, you might want to clone a person standing in the foreground of a picture so she appears to be standing near a tree at the back of a photo. She should be smaller because of perspective, which you can accomplish with this tool. Click and drag the perspective bars at the corners of the image to roughly match the perspective within the picture (the depth), click the Perspective Clone tool, and Ctrl-click to select the area you want to clone. Then draw where you want the cloned material to appear. Blur/Sharpen Clicking and drawing on the image will spot blur or sharpen the image, depending on the settings in the tool options area, in the lower half of the toolbar. Smudge As its name suggests, clicking and drawing with this tool will smudge the image, rather like rubbing a still-wet painting with your finger. Dodge/Burn Lets you spot lighten and darken an image by clicking and drawing on the image. The results depend on the settings in the tool options part of the window. Directly beneath the image-editing tool icons, on the left, is an icon that shows the foreground and background colors that will be used when drawing with tools such as the Paintbrush. To define a new color, double-click either the foreground (top) or background (bottom) color box. Beneath these icons, you’ll see the various options for the selected tool. The brush selector lets you choose the thickness of the brushstrokes and patterns that are used with various tools. Simply click each to change them. By using the buttons at the bottom of the window, you can save the current tool options, load tool options, and delete a previously saved set of tool options. Clicking the button on the bottom right lets you revert to the default settings for the tool currently being used (useful if you tweak too many settings!). Next to the toolbar window is the Layers dialog box. You can close this if you wish, and reopen it later by selecting Dialogs ➤ Layers.
- 476. 440 CHAPTER 20 ■ DIGITAL PHOTOS The Basics of GIMP After you’ve started GIMP (and assigned it a virtual desktop), you can load an image by selecting File ➤ Open. The browser dialog box offers a preview facility on the right side of the window. You will probably need to resize the image window so that it fits within the remainder of the screen. You can then use the Zoom tool (see Table 20-1) to ensure that the image fills the editing window, which will make working with it much easier. Alternatively, you can click the Zoom drop-down list in the lower-left of the image window. You can save any changes you make to an image by right-clicking it and selecting File ➤ Save As. You can also print the image from the same menu. Before you begin editing with GIMP, you need to be aware of some essential concepts that are vital to understand in order to get the most from the program: Copy, cut, and paste buffers: Unlike some Windows programs, GIMP lets you cut or copy many selections from the image and store them for use later. It refers to these saved selections as buffers, and each must be given a name for future reference. A new buffer is created by selecting an area using any of the selection tools, then right-clicking within the selection area and selecting Edit ➤ Buffer ➤ Copy Named (or Cut Named). Pasting a buffer back is a matter of right-clicking the image and selecting Edit ➤ Buffer ➤ Paste Named. Paths: GIMP paths are not necessarily the same as selection areas, although it’s nearly always possible to convert a selection into a path and vice versa (right-click within the selection or path, and look for the relevant option on the Select menu: Select ➤ To Path or Select ➤ From Path). In general, paths allow the creation of complex shapes, rather than the simple geometric shapes offered by the selection tools. You can also be more intricate in your selections, as shown in the example in Figure 20-4. Paths can be saved for later use. To view the Paths dialog box, right-click the image and select Dialogs ➤ Paths. ■Tip Getting rid of a selection or path you’ve drawn is easy. In the case of a path, simply click any other tool. This will cause the path to disappear. To get rid of a selection, using any selection tool, quickly click once on the image, being careful not to drag the mouse while doing so.
- 477. C HA PTE R 20 ■ DIGITA L PHOTOS 441 Figure 20-4. Paths allow for more elaborate and intricate selections, such as those that involve curves. Layers: In GIMP (along with most other image-editing programs), layers are like transparent sheets of plastic that are placed on top of the image. Anything can be drawn on each individual transparent sheet, and many layers can be overlaid in order to create a complicated image. Layers also let you cut and paste parts of the image between them. It’s also possible to apply effects and transformations to a single layer, rather than to the entire image. The Layers dialog box, shown in Figure 20-5, appears by default, but if you closed it earlier, you can open it again by right-clicking the image and selecting Dialogs ➤ Layers. The layers can be reordered by clicking and dragging them in the dialog box. In addition, the blending mode of each layer can be altered. This refers to how it interacts with the layer below it. For example, its opacity can be changed so that it appears semitransparent, thereby showing the contents of the layer beneath.
- 478. 442 CHAPTER 20 ■ DIGITAL PHOTOS Figure 20-5. Set the opacity of various layers by clicking and dragging the relevant slider in the Layers dialog box. Making Color Corrections The first step when editing most images is to correct the brightness, contrast, and color saturation. This helps overcome some of the deficiencies that are commonly found in digital photographs or scanned-in images. To do this, right-click the image and select Colors. You’ll find a variety of options to let you tweak the image, allowing you a lot of control over the process. For simple brightness and contrast changes, selecting the Brightness-Contrast menu option will open a dialog box where clicking and dragging the sliders will alter the image. The changes you make will be previewed on the image itself, so you should be able to get things just right. Similarly, the Hue-Saturation option will let you alter the color balance and the strength of the colors (the saturation) by clicking and dragging sliders. By selecting the color bar options at the top of the window, you can choose individual colors to boost. Clicking the Master button will let you once again alter all colors at the same time.
- 479. C HA PTE R 20 ■ DIGITA L PHOTOS 443 The trouble with clicking and dragging sliders is that it relies on human intuition. This can easily be clouded by a badly calibrated monitor, which might be set too dark or too light. Because of this, GIMP offers another handy option: Levels. To access the Levels feature, right-click the image and select Colors ➤ Levels. This presents a chart of the brightness levels in the photo and lets you set the dark, shadows, and highlight points, as shown in Figure 20-6. Three sliders beneath the chart represent, from left to right, the darkest point, the midtones (shadows), and the highlights within the picture. The first step is to set the dark and light sliders at the left and right of the edges of the chart. This will make sure that the range of brightness from the lightest point to the darkest point is set correctly. The next step is to adjust the middle slider so that it’s roughly in the middle of the highest peak within the chart. This will accurately set the midtone point, ensuring an even spread of brightness across the image. Figure 20-6. The Levels function can be used to accurately set the brightness levels across an image.
- 480. 444 CHAPTER 20 ■ DIGITAL PHOTOS A little artistic license is usually allowed at this stage, and depending on the effect you want in the photo, moving the midtone slider a little to the left and/or right of the highest peak might produce more acceptable results. However, be aware that the monitor might be showing incorrect brightness or color values. Cropping and Healing After you’ve adjusted the colors, you might want to use the Crop tool to remove any extra- neous details outside the focus of the image. For example, in a portrait of someone taken from a distance away, you might choose to crop the photo to show only the person’s head and shoulders, or you might separate a group of people from their surroundings, as shown in Figure 20-7. Figure 20-7. You can use the Crop tool to remove any irrelevant details surrounding the subject of your photo. You might also want to use the Healing tool to remove facial blemishes. Start by using the Zoom tool to close in on the area. If the blemish is small, you might need to zoom in quite substantially. Then try to find an area of skin that is clear and from which you can
- 481. C HA PTE R 20 ■ DIGITA L PHOTOS 445 copy. Ctrl-click that area. Then click and draw over the blemish. The crosshair indicates the area from which you’re copying. Sharpening One handy trick that can improve your photos is to use the Sharpen filter. This has the effect of adding definition to the image and reducing any slight blur caused by camera shake or poor focusing. To apply the Sharpen filter, right-click the image and select Filters ➤ Enhance ➤ Sharpen. As shown in Figure 20-8, a small preview window will show the effect of the sharpening on the image (you might need to use the scroll bars to move to an appropriate part of the image). Clicking and dragging the slider at the bottom of the dialog box will alter the severity of the sharpening effect. Too much sharpening can ruin a picture, so be careful. Try to use the effect subtly. Figure 20-8. Sharpening an image can give it better definition, but keep checking the preview. The Sharpen filter is just one of many filters you can apply in GIMP, as explained in the next section.
- 482. 446 CHAPTER 20 ■ DIGITAL PHOTOS Applying Filters Like other image-editing programs, GIMP includes many filters to add dramatic effects to your images. Filters are applied either to the currently selected layer or to a selection within the layer. To apply a filter, right-click the image and choose the relevant menu option. If you don’t like an effect you’ve applied, you can reverse it by selecting Edit ➤ Undo, or by pressing Ctrl+Z. The submenus offer filters grouped by categories, as follows: Blur: These filters add various kinds of blur to the image or selection. For example, Motion Blur can imitate the effect of photographing an object moving at speed with a slow shutter. Perhaps the most popular blur option is Gaussian Blur, which has the effect of applying a soft and subtle blur. Enhance: The Enhance effects are designed to remove various artifacts from an image or otherwise improve it. For example, the Despeckle effect will attempt to remove unwanted noise within an image (such as flecks of dust in a scanned image). The Sharpen filter discussed in the previous section is located here, as is Unsharp Mask, which offers a high degree of control over the image-sharpening process. Distorts: As the name of this category of filters suggests, the effects here distort the image in various ways. For example, Whirl and Pinch allow you to tug and push the image to distort it (to understand what is meant here, imagine printing the image on rubber and then pinching or pushing the surface). This category also contains other special effects, such as Pagecurl, which imitates the curl of a page at the bottom of the picture. Light and Shadow: Here, you will find filters that imitate the effects that light and shadow can have on a picture, such as adding sparkle effects to highlights or imitating lens flare caused by a camera’s lens. Noise: This collection of filters is designed to add speckles or other types of artifacts to an image. These filters are offered within GIMP for their potential artistic effects, but they can also be used to create a grainy film effect—simply click Scatter RGB. Edge-Detect: This set of filters can be used to automatically detect and delineate the edges of objects within an image. Although this type of filter can result in some inter- esting results that might fall into the category of special effects, it’s primarily used in conjunction with other tools and effects. Generic: In this category, you can find a handful of filters that don’t seem to fall into any other category. Of particular interest is the Convolution Matrix option, which lets you create your own filters by inputting numeric values. According to GIMP’s programmers, this is designed primarily for mathematicians, but it can also be used by others to create random special effects. Simply input values and then preview the effect.
- 483. C HA PTE R 20 ■ DIGITA L PHOTOS 447 Combine: Here, you’ll find filters that combine two or more images into one. Artistic: These filters allow you to add paint effects to the image, such as making it appear as if the photo has been painted in impressionistic brushstrokes or painted on canvas. Figure 20-9 shows an example of applying the Oilify filter for an oil painting effect. Figure 20-9. The Artistic effects can be used to give images an oil painting effect. Map: These filters aim to manipulate the image by treating it like a piece of paper that can be folded in various ways and stuck onto 3D shapes (a process referred to as mapping). Because the image is treated as if it were a piece of paper, it can also be copied, and the copies placed on top of each other to create various effects. Render: Here, you’ll find filters designed to create new images from scratch, such as clouds or flame effects. They obliterate anything that was previously underneath on that particular layer or within that selection, and the original image has no bearing on what is generated by the filter.
- 484. 448 CHAPTER 20 ■ DIGITAL PHOTOS Web: Here, you can create an image map for use in a web page. An image map is a single image broken up into separate hyperlinked areas, typically used on a web page as a sophisticated menu. For example, an image map is frequently used for a geograph- ical map on which you can click to get more information about different regions. Animation: These filters aim to manipulate and optimize GIF images, which are commonly used to create simple animated images for use on web sites. Alpha to Logo: These filters are typically used to create special effects for text. They are quite specialized and require an in-depth knowledge of how GIMP works, partic- ularly the use of alpha channels. Decors: These filters are used to add decorations and special effects to an image. Filters include Coffee Stains (which actually adds coffee stains to your image), Old Photo, Round Corners, and Bevel Borders. ■Tip If you like GIMP, you might be interested in Beginning GIMP: From Novice to Professional by Akkana Peck (1-59059-587-4; Apress, 2006). This book offers a comprehensive, contemporary, and highly readable guide to GIMP. GIMPSHOP GIMP is one of the most powerful programs available for Linux, but not everyone is enamored of its user interface. A bone of contention for some is that GIMP uses almost completely different terminology from that used by Adobe Photoshop. One developer became so annoyed by this that he created a new version of GIMP called GIMPshop (www.gimpshop.com). This is ostensibly exactly the same as the GIMP program, but the names of the tools have been changed to match those of Photoshop (or the simpler Photoshop Elements program). In a similar way, many of the GIMP’s right-click menu entries have also been changed so that they’re iden- tical to Photoshop’s menu options. The freedom to adapt programs in this way is one of the benefits of open source software. The ability to take program code and create your own version is the foundation of Linux. GIMPshop isn’t available via Synaptic Package Manager, but the Linux version offered for download at the GIMPshop web site can be installed under Ubuntu. Once you’ve downloaded the package, see Chapter 29 to learn how software installation works under Ubuntu.
- 485. C HA PTE R 20 ■ DIGITA L PHOTOS 449 Summary In this chapter, we’ve taken a look at working with images under Ubuntu. This has involved an examination of one of the best programs available for the task under any operating system, GIMP, but first we started by looking at the F-Spot photo manager tool. F-Spot lets you easily import pictures, catalog them, and make some adjustments. Then you learned how to get started using GIMP to edit your images. In the next part of the book, we move on from multimedia to look at another core component of Ubuntu: the OpenOffice.org suite, which provides word processing, spreadsheet, presentation, and other functions.
- 489. CHAPTER 21 ■■■ Making the Move to OpenOffice.org Y ou might be willing to believe that you can get a complete operating system for no cost. You might even be able to accept that this offers everything Windows does and much more. But one stumbling block many people have is in believing a Microsoft Office–compatible office suite comes as part of the zero-cost bundle. It’s a step too far. Office costs hundreds of dollars—are they expecting us to believe that there’s a rival product that is free? Well, there is, and it’s called OpenOffice.org. It comes preinstalled with Ubuntu, as well as most other Linux distributions, making it the Linux office suite of choice. It’s compatible with most Microsoft Office files, too, and even looks similar and works in a comparable way, making it easy to learn. What more could you want? Office Similarities OpenOffice.org started life as a proprietary product called Star Office. Sun Microsystems bought the company behind the product and released its source code in order to encourage community development. This led to the creation of the OpenOffice.org project, a collab- oration between open-source developers and Sun. This project has released several new versions of OpenOffice.org, and at the time of this writing, the current version is 2.0. This is the version supplied with Ubuntu. ■Note For what it’s worth, Sun still sells Star Office. This is based on the OpenOffice.org code, so it’s effec- tively the same program. However, in addition to the office suite itself, Sun includes several useful extras such as fonts, templates, and the all-important technical support, which you can contact if you get stuck trying to undertake a particular task. 453
- 490. 454 CH APT ER 21 ■ MA KI NG T H E MO VE T O O PE NO FF IC E.O RG OpenOffice.org features a word processor, spreadsheet program, presentation package, drawing tool (vector graphics), web site creation tool, database program, and several extras. As such, it matches Microsoft Office almost blow-for-blow in terms of core functionality. See Table 21-1 for a comparison of core packages. Table 21-1. How the Office and OpenOffice.org Suites Compare Microsoft Office OpenOffice.org Function Word Writer Word processor Excel Calc Spreadsheet PowerPoint Impress Presentations Visio Draw1 Technical drawing/charting FrontPage Writer2 Web site creation Access Base3 Database 1 Draw is a vector graphics creation tool akin to Adobe Illustrator. Creating flow charts or organizational diagrams is one of many things it can do. For some reason, it is not on the Ubuntu Applications menu; to start Draw, open any OpenOffice.org application, and click File ➤ New ➤ Drawing. 2 Writer is used for word processing and HTML creation; when switched to Web mode, its functionality is altered appropriately. 3 Writer and Calc can be coupled to a third-party database application such as MySQL or Firebird; however, Office.org also comes with the Base relational database. This must be installed separately—see Chapter 26. You should find the functionality within the packages is duplicated, too, although some of the very specific features of Microsoft Office are not in OpenOffice.org. But OpenOffice.org also has its own range of such tools not yet found in Microsoft Office! OpenOffice.org does have a couple of notable omissions. Perhaps the main one is that it doesn’t offer a directly comparable Outlook replacement. However, as we will discuss in Chapter 27, the Evolution application offers a highly capable reproduction of Outlook, with e-mail, contacts management, and calendar functions all in one location. In Ubuntu, you’ll find Evolution on the Applications ➤ Internet menu. Evolution isn’t directly linked to OpenOffice.org, but it retains the overall Ubuntu look, feel, and way of operating. OpenOffice.Org Key Features Key features of OpenOffice.org include the ability to export documents in Portable Docu- ment Format (PDF) format across the entire suite of programs. PDF files can then be read on any computer equipped with PDF display software, such as Adobe Acrobat Reader. In addition, OpenOffice.org features powerful accessibility features that can, for example, help those with vision disabilities use the programs more effectively. For those who are
- 491. C HAPT ER 21 ■ MA KING THE MOVE TO OPEN OFFICE .ORG 455 technically minded, OpenOffice.org can be extended very easily with a variety of plug-ins, which allow the easy creation of add-ons using many different programming languages. Although OpenOffice.org largely mirrors the look and feel of Microsoft Office, it adds its own flourishes here and there. This can mean that some functions are located on different menus, for example. However, none of this poses a challenge for most users, and OpenOffice.org is generally regarded as very easy to learn. File Compatibility As well as core feature compatibility, OpenOffice.org is also able to read files from Microsoft Office versions up to and including Office 2003. Currently OpenOffice.org doesn’t support Office 2007 files, although several projects are working on adding support, and it’s likely it will be added soon. This is just one more reason why you should regularly update Ubuntu online in order to make sure you’re running the very latest versions of each program. ■Note It’s fair to say that many people still use the older Office file formats, even if they’re using the latest version of Office. This is done to retain compatibility with other users who may not yet have upgraded. Although file compatibility problems are rare, two issues occasionally crop up when opening Microsoft Office files in OpenOffice.org: VBA compatibility: OpenOffice.org isn’t currently compatible with Microsoft Office Visual Basic for Applications (VBA), although work is being undertaken to allow this functionality. OpenOffice.org uses a similar but incompatible internal programming language. This means that Microsoft macros within a document probably won’t work when the file is imported to OpenOffice.org. Such macros are typically used in Excel spreadsheets designed to calculate time sheets, for example. In general, however, only high-end users use VBA. Document protection: OpenOffice.org is unable to open any Office files that have a password, either to protect the document from changes or to protect it from being viewed. Theoretically, it would be easy for OpenOffice.org’s programmers to include such functionality, but the laws of many countries make creating such a program feature illegal (it would be seen as a device to overcome copy protection). The easiest solution is to ask whoever sent you the file to remove the password protection. For what it’s worth, OpenOffice.org’s has its own form of password protection.
- 492. 456 CH APT ER 21 ■ MA KI NG T H E MO VE T O O PE NO FF IC E.O RG If you find that OpenOffice.org isn’t able to open an Office file saved by your colleagues, you can always suggest that they, too, make the switch to OpenOffice.org. They don’t need to be running Ubuntu to do so. Versions are available to run on all Windows platforms, as well as on the Apple Macintosh. ■Note Two versions of OpenOffice.org are available for Mac OS X: the standard release, which runs in an X window and is available from the main OpenOffice.org web site, and NeoOffice, which has been adapted to run natively within OS X. For more details, see www.neooffice.org. As with the Ubuntu version, versions of OpenOffice.org available for other operating systems are entirely free of charge. Indeed, for many people who are running versions of Office they’ve installed from “borrowed” CDs, OpenOffice.org offers a way to come clean and avoid pirating software. For more details and to download OpenOffice.org, visit www.openoffice.org. Once your colleagues have made the switch, you can exchange files using OpenOffice. org’s native format, or opt to save files in the Microsoft Office file formats (.doc, .xls, .ppt, and so on). Figure 21-1 shows the file type options available in OpenOffice.org’s word processor component’s Save As dialog box. ■Note OpenOffice.org also supports Rich Text Format (RTF) text documents and comma-separated value (CSV) data files, which are supported by practically every office suite program ever made. When it comes to sharing files, there’s another option: save your files in a non-Office format such as PDF or HTML. OpenOffice.org is able to export documents in both formats, and most modern PCs equipped with Adobe Acrobat or a simple web browser will be able to read them. However, while OpenOffice.org can open and edit HTML files, it can export documents only as PDF files, so this format is best reserved for files not intended for further editing.
- 493. C HAPT ER 21 ■ MA KING THE MOVE TO OPEN OFFICE .ORG 457 Figure 21-1. All the OpenOffice.org components are fully compatible with Microsoft Office file formats. OPEN DOCUMENT FORMAT One of the principles behind all open-source software is the idea of open file formats. This means that if someone creates a new open-source word processor, she also makes sure that the technology behind the file format is explained, so that other people can adapt their programs to read and/or save in that file format. To meet the goals of open-source software, the OASIS OpenDocument Format (ODF) was created, and this is utilized in OpenOffice.org 2.0. This is a completely open and free to use office document file format that all software suites can adopt. The idea is that ODF will make swapping files between all office suites easy. Sadly, Microsoft has decided not to support ODF and is sticking with its own proprietary file formats, although it has recently opened up the file formats and made a promise not to sue anybody who imple- ments them in non-Microsoft software. However, several local governments in countries all around the world have adopted ODF, and there’s little doubt that ODF will become one of the main ways of disseminating and sharing documents online.
- 494. 458 CH APT ER 21 ■ MA KI NG T H E MO VE T O O PE NO FF IC E.O RG The Right Fonts One key to compatibility with the majority of Microsoft Office files is ensuring you have the correct fonts. This is an issue even when using Windows. It’s very common to open an Office document to find the formatting incorrect, because you don’t have the fonts used in the construction of the document. Although most Windows systems have many fonts, most people tend to rely on a handful of core fonts, which are default on most Windows installations: Arial, Tahoma, Verdana, Trebuchet MS, and Times New Roman (MS Comic Sans might also be included in that list, although it isn’t often used within business documents). You can obtain these fonts and install them on your Ubuntu system in several ways. Here, we’ll cover two methods: copying your fonts from Windows, and installing Microsoft’s TrueType Core Fonts. The latter method is by far the easier way of undertaking this task. Copying Windows Fonts If you dual-boot Ubuntu with Windows, you can delve into your Windows partition’s font folder and copy across every font you have available under Windows. This method is useful if you wish to copy across all the fonts you use under Windows, such as those installed by third-party applications. If you wish to get just Arial and Times New Roman, you might want to skip ahead to the next section. ■Caution Installing Windows fonts under Ubuntu is a legally gray area. Technically speaking, there’s no reason why you shouldn’t be able to use the fonts under Ubuntu. Purchasing Windows as well as any software running on it should also have meant you purchased a license to use the fonts. But the situation is far from clear. You’d be well-advised to read the Windows End-User License Agreement (EULA) for more guidance. This can be found in the packaging for your computer. 1. Click the entry on the Places menu for your Windows partition, so it is mounted and its icon appears on the desktop. 2. Click Applications ➤ Accessories ➤ Terminal. In the window that appears, type the following: mkdir .fonts;nautilus /media/disk/;nautilus .fonts This will cause two Nautilus file browsing windows to appear: one displaying the directories in your Windows partition and the other displaying your personal fonts folder (the first command in the line above creates this folder).
- 495. C HAPT ER 21 ■ MA KING THE MOVE TO OPEN OFFICE .ORG 459 3. In the Nautilus window displaying the Windows directories, navigate to your Windows fonts folder. The location of this varies depending on which version of Windows you’re using. On our Windows Vista test computer, it was located in the Windows/Fonts directory, but on our Windows XP Home test machine, it was located in the WINDOWS/Fonts directory. Remember that case sensitivity is important under Ubuntu! 4. Still in the window displaying your Windows font directory, click View ➤ View As List and then click the Type column header in the window, so that the list is sorted according to file extensions. Scroll down to the list of TrueType fonts, and select them all. This can be done by clicking the first, holding down Shift, and then clicking the last. 5. Click and drag all the TrueType fonts to the Nautilus window displaying your per- sonal font directory. The fonts will be copied across and installed automatically. In some of our tests, this happened instantly, and there was no indication copying had happened (such as a dialog box). 6. Close any open program windows and start them again. You should find your Windows fonts are now available. Installing TrueType Core Fonts If you don’t want to undertake the font-copying maneuver, you can download and install Microsoft’s TrueType Core Fonts. This package contains common Windows fonts, including Arial and Times New Roman. ■Note The fonts were made legally available by Microsoft in 1996 for use under any operating system— for more details, see http://en.wikipedia.org/wiki/Core_fonts_for_the_Web. Here’s how it’s done: 1. Click System ➤ Administration ➤ Synaptic Package Manager. Enter your password to continue. 2. Click the Search icon, type msttcorefonts, and click the Search button. Click the check box alongside the entry in the results list, and select Mark for Installation. You’ll be warned an additional program needs to be installed; this is fine. Then click Apply on the main toolbar to install the fonts. During installation you’ll be warned that the fonts are part of a larger system called Debian Fonts Manager. You can ignore this. Just click Forward when it appears.
- 496. 460 CH APT ER 21 ■ MA KI NG T H E MO VE T O O PE NO FF IC E.O RG 3. Close all program windows, click System ➤ Quit, and opt to log out of the system. Then log back in again. You should now find the Windows fonts are available in all applications, including OpenOffice.org, as shown in Figure 21-2. Figure 21-2. Vital Microsoft fonts are just a download away courtesy of the Synaptic Package Manager. OTHER LINUX OFFICE SUITES OpenOffice.org is widely regarded as one of the best Linux office suites, but it’s not the only one. Its main competitor is KOffice. KOffice tightly integrates into the KDE desktop and mirrors much of its look and feel. It includes a word processor, spreadsheet, presentation package, flow-charting tool, database- access tool, and much more. As with OpenOffice.org, in most cases, you can load and save Microsoft Office files. For more details, see its home page at www.koffice.org. It’s available with Ubuntu, too. Just use the Synaptic Package Manager to search for and install it. In addition, there are several open-source office applications that aren’t complete office suites. For example, AbiWord is considered an excellent word processor, which packs in a lot of features but keeps the user interface very simple. It’s partnered by Gnumeric, a spreadsheet application that is developed separately (although both aim to be integrated into the GNOME desktop environment). For more details, see www.abisource.com and www.gnome.org/projects/gnumeric/, respectively. You can also find both of these programs in the Ubuntu software repositories (use the Synaptic Package Manager to search for them).
- 497. C HAPT ER 21 ■ MA KING THE MOVE TO OPEN OFFICE .ORG 461 Summary This chapter was a general introduction to OpenOffice.org, providing an overview of what you can expect from the programs within the suite. In particular, we focused on the extent of the suite’s similarities with Microsoft Office and discussed issues surrounding file compatibility with Microsoft Office. We also looked at how Windows fonts can be brought into Ubuntu, which aids in successfully importing and creating compatible documents. In the next chapter, you’ll learn about the configuration options globally applicable to the suite, as well as common functions provided across all the programs.
- 499. CHAPTER 22 ■■■ OpenOffice.org Overview A ll the programs in the OpenOffice.org suite rely on a common interface, and there- fore look and operate in a similar way. They are also configured in an identical way, and all rely on central concepts such as wizards, which guide you through the creation of particular types of documents. In addition, many components within the suite are shared across the various programs. For example, the automatic chart creation tool within Calc can also be used within Writer. In this chapter, we’ll look at the OpenOffice.org suite as a whole, and explain how it’s used and configured. In the following chapters, we’ll examine some specific programs in the suite. Introducing the Interface If you’ve ever used an office suite, such as Microsoft Office, you shouldn’t find it too hard to get around in OpenOffice.org. As with Microsoft Office, OpenOffice.org relies primarily on toolbars, a main menu, and separate context-sensitive menus that appear when you right-click. In addition, OpenOffice.org provides floating palettes that offer quick access to useful functions, such as paragraph styles within Writer. Figure 22-1 provides a quick guide to the OpenOffice.org interface, showing the following components: • Menu bar: The menus provide access to most of the OpenOffice.org functions. • Standard toolbar: This toolbar provides quick access to global operations, such as saving, opening, and printing files, as well as key functions within the program being used. The Standard toolbar appears in all OpenOffice.org programs and also provides a way to activate the various floating palettes, such as the Navigator, which lets you easily move around various elements within the document. 463
- 500. 464 CHAPTER 22 ■ OPENOFFICE.ORG OVERV IEW • Formatting toolbar: As its name suggests, this toolbar offers quick access to text- formatting functions, similar to the type of toolbar used in Microsoft Office applica- tions. Clicking the B icon will boldface any selected text, for example. This toolbar appears in Calc, Writer, and Impress. • Ruler: The ruler lets you set tabs and alter margins and indents (within programs that use rulers). • Status bar: The status bar shows various aspects of the configuration, such as whether Insert or Overtype mode is in use. • Document area: This is the main editing area. Most of the programs rely on the Standard and Formatting toolbars to provide access to their functions, and some programs have additional toolbars. For example, applications such as Impress (a presentation program) and Draw (for drawing vector graphics) have the Drawing toolbar, which provides quick access to tools for drawing shapes, adding lines, and creating fills (the blocks of color within shapes). Figure 22-1. The OpenOffice.org interface has several components.
- 501. C HA PTER 22 ■ OPEN OFFICE .OR G OV ERVIEW 465 Customizing the Interface You can select which toolbars are visible on your screen, as well as customize those that are already there. You can also add new toolbars and customize the OpenOffice.org menus. Adding Functions to Toolbars The quickest way to add icons and functions to any toolbar is to click the two small arrows at the right of a toolbar and select the Visible Buttons entry on the menu that appears. This will present a list of currently visible icons and functions, along with those that might prove useful on that toolbar but are currently hidden. Any option already visible will have a check next to it. Additionally, you can add practically any function to a toolbar, including the options from the main menus and many more than those that are ordinarily visible. Here are the steps: 1. Click the two small arrows to the right of a toolbar, and select the Customize Toolbar option. 2. In the Customize dialog box, click the Add button in the Toolbar Content section to open the Add Commands dialog box, as shown in Figure 22-2. Figure 22-2. Adding a new function to the toolbar is very easy within OpenOffice.org.
- 502. 466 CHAPTER 22 ■ OPENOFFICE.ORG OVERV IEW 3. Choose a category from the list on the left to see the available commands in the list on the right. The categories of functions are extremely comprehensive. For example, under the Format category, you’ll find entries related to specific functions, such as increasing font sizes or setting a shadow effect behind text. Table 22-1 provides brief descriptions of each of the categories listed in the Add Commands dialog box. 4. Select the function you want to add on the right side of the Add Commands dialog box, and then click the Add button. 5. Click the Close button. You’ll then see your new function in the list of icons in the Customize dialog box, under the Toolbar Content heading. The new icon will be automatically selected. 6. Click and drag to move the new function left or right on the toolbar itself (you’ll see the toolbar itself update when you release the mouse button). Alternatively, you can highlight the icon and click the up and down arrows next to the list. To temporarily hide the new icon, or any other icon, remove the check from alongside it. Table 22-1. OpenOffice.org Toolbar Customization Categories Category Description Application These options relate to the specific OpenOffice.org application you’re using. For example, if you select to customize a toolbar within Writer, the Application category menu will offer functions to start AutoPilots (effectively wizards) that will build word processor documents. View This category offers options related to the look and feel of the suite, such as which items are visible within the program interface. Templates In this category, you’ll find options related to the creation and use of document templates. Edit This category contains options related to cutting, pasting, and copying items within the document, as well as updating elements within it. Options These are various options that relate to configuration choices in OpenOffice.org, allowing you to control how it works. BASIC Options under this category relate to the creation and playback of OpenOffice.org macros. Insert This category includes options related to inserting objects, such as sound, graphics, and elements from other OpenOffice.org documents. Documents This category provides options specific to document control, such as those related to exporting documents as PDF files or simply saving files. Format Here, you’ll find a range of options related largely to text formatting, but also some concerned with formatting other elements, such as drawings and images.
- 503. C HA PTER 22 ■ OPEN OFFICE .OR G OV ERVIEW 467 Table 22-1. OpenOffice.org Toolbar Customization Categories (Continued) Category Description Controls Under this heading, you’ll find widgets that can be used in conjunction with formulas or macros, such as check boxes, buttons, text box creation tools, and so on. Navigate This category offers tools that let you move around a document quickly, such as the ability to quickly edit headers and footers, or move from the top of the page to the end very quickly. Table Here, you’ll find options related to the creation of tables. Drawing Here, you’ll find tools related to drawing objects, such as shapes and lines, and also tools for creating floating text boxes. Graphic This category presents a handful of options related to manipulating bitmap graphics that are inserted into the document. Data Here, you’ll find a couple of options related to working with information sources, such as databases. Frame These options relate to any frames inserted into the document, such as how elements within the frame are aligned and how text is wrapped around the frame. Numbering These are various options related to creating automatic numbered or bulleted lists. Modify These options relate to the drawing components within OpenOffice.org and let you manipulate images or drawings in various ways by applying filters. OpenOffice.org Here, you can select from various ready-made macros, which provide some of BASIC Macros OpenOffice.org’s functions. Many functions that can be added are automatically given a relevant toolbar icon, but you can choose another icon for a function by selecting the icon in the list in the Customize dialog box, clicking Modify, and then selecting Change Icon. You can also use this method to change an icon that already appears on a toolbar. ■Note To delete an icon from a toolbar, click the two small arrows to the right of a toolbar, and select the Customize Toolbar option. Select the icon you want to remove, click the Modify button, and choose to delete it. Adding a New Toolbar If you want to add your own new toolbar to offer particular functions, you’ll find it easy to do. Here are the steps:
- 504. 468 CHAPTER 22 ■ OPENOFFICE.ORG OVERV IEW 1. Click the two small arrows to the right of any toolbar and select Customize Toolbar from the list of options. Don’t worry—you’re not actually going to customize that particular toolbar! 2. In the Customize dialog box, click the New button at the top right. 3. Give the toolbar a name. The default entry for the Save In field is correct, so you don’t need to alter it. 4. Populate the new toolbar, following the instructions in the previous section. 5. Once you’ve finished, click the OK button. You should see your new toolbar beneath the main toolbars. To hide it in the future, click View ➤ Toolbars, and then remove the check alongside the name of your toolbar. Customizing Menus You can also customize the OpenOffice.org menus. Here are the steps: 1. Select Tools ➤ Customize from the menu bar. 2. In the Customize dialog box, select the Menus tab at the top left. 3. Choose which menu you wish to customize from the Menu drop-down list. 4. Select the position where you wish the new function to appear on the menu, by selecting an entry on the menu function list, and then click the Add button. 5. Add commands to the menu, as described earlier in the “Adding Functions to Toolbars” section. The up and down arrows in the Customize dialog box allow you to alter the position of entries on the menu. You could move those items you use frequently to the top of the menu, for example. You can remove an existing menu item by highlighting it in the Customize dialog box, clicking the Modify button, and then clicking Delete. If you make a mistake, simply click the Reset button at the bottom right of the Customize dialog box to return the menus to their default state.
- 505. C HA PTER 22 ■ OPEN OFFICE .OR G OV ERVIEW 469 Configuring OpenOffice.org Options In addition to the wealth of customization options, OpenOffice.org offers a range of configuration options that allow you to make it work exactly how you wish. Within an OpenOffice.org program select Tools ➤ Options from the menu to open the Options dialog box, as shown in Figure 22-3. Figure 22-3. OpenOffice.org’s main configuration options are accessed by selecting Tools ➤ Options. Most of the configuration options offered within each program apply across the suite, but those under the heading of the program’s name apply only to the program in use. In other words, to set the options specific to Calc, you need to use the Calc Options dialog box. But to set global options for the entire suite, you can use any program’s Options dialog box.
- 506. 470 CHAPTER 22 ■ OPENOFFICE.ORG OVERV IEW A variety of options are offered, allowing you to tweak everything from the default file format to the colors used by default within the software. Table 22-2 briefly describes each of the OpenOffice.org configuration options. Table 22-2. OpenOffice.org Configuration Options Option Description OpenOffice.org User Data This is the personal data that will be added to the documents you create. You can leave this area blank if you wish. General This offers a handful of miscellaneous options, such as how to handle two-digit dates, when the help system should step in to offer tips, how the help system should be formatted (such as in high resolution for people with vision problems), and whether printing a document is interpreted by OpenOffice.org as modifying it. Memory This entry relates to how much system memory OpenOffice.org can use. You can limit the number of undo steps, for example, and alter the cache memory used for holding graphical objects. View Here, you can alter the look, feel, and operation of OpenOffice.org. You can define whether the middle mouse button performs a paste operation (which is consistent with how Ubuntu works), or whether it should perform a scrolling function, as with Windows. You can also alter elements such as whether icons appear in menus and if fonts are previewed in the toolbar menu. Print This option lets you adjust how printing is handled within OpenOffice.org. The functions relate to those that can stop documents from printing incorrectly, such as reducing any transparency effects within the documents so on-page elements don’t appear faint or completely disappear in the final output. (Note that specific print functions are handled within the Print dialog box when you actually print a document.) Paths This is where the file paths for user-configured and vital system tools are handled. Generally, there’s little reason to edit this list, although you might choose to alter the default location where your documents are saved (simply double-click the My Documents entry to do this). Colors Here, you can define the default color palette that appears in the various programs in the suite. Fonts By creating entries here, you can automatically substitute fonts within doc- uments you open for others on your system. If you don’t have the Microsoft core fonts installed, this might prove useful. For example, you might choose to substitute Arial, commonly used in Microsoft Office documents, for Luxi Sans, one of the sans serif fonts used under Ubuntu. Security This option controls which types of functions can be run within OpenOffice.org. For example, you can choose whether macros created by third parties should be run when you open a new document. Appearance Here, you can alter the color scheme used within OpenOffice.org, in a simi- lar way to how you can alter the default Ubuntu desktop color scheme. Individual elements within documents and pages can be modified, too.
- 507. C HA PTER 22 ■ OPEN OFFICE .OR G OV ERVIEW 471 Table 22-2. OpenOffice.org Configuration Options (Continued) Option Description Accessibility This option relates to features that might help people with vision disabilities to use OpenOffice.org. For example, you can define whether animated graphics are shown on the screen. Java This option lets you control whether you use the Java Runtime Environ- ment, which may be necessary to use some of OpenOffice.org’s features. Load/Save General Options here relate to how files are saved. You can select whether the default is to save in OpenOffice.org or Microsoft Office format. Choosing the latter is useful if you share a lot of documents with colleagues who are not running OpenOffice.org. VBA Properties This option relates to how Visual Basic for Applications (VBA) code is handled when Microsoft Office documents are opened. Specifically, it ensures that the code isn’t lost when the file is saved again. Microsoft Office This option provides functions specifically needed to convert or open Microsoft Office files within OpenOffice.org. HTML Here, you can set options that affect the compatibility of HTML files saved Compatibility within OpenOffice.org. Language Settings Languages Here, you can set your local language so that documents are spell-checked correctly. In addition, Asian language support can be activated, which allows for more complex document layout options. Writing Aids Under this option, you can activate or deactivate various plug-ins designed to help format documents, such as the hyphenator or the spell-checking component. In addition, you can alter how the spell-checker works, such as whether it ignores capitalized words. OpenOffice.org Writer General Here, you can alter various options related to the editing of word processor documents, such as which measurements are used on the ruler (centimeter, inches, picas, and so on). View Under this option, you can configure the look and feel of the Writer program, such as which scroll bars are visible by default. You can also turn off the display of various page elements, such as tables and graphics. Formatting Aids This option lets you choose which symbols appear for “invisible” elements (such as the carriage return symbol or a dot symbol to indicate where spaces have been inserted) in Writer. Grid This controls whether page elements will snap to an invisible grid. You can also define the dimensions and spacing of the grid cells here. Basic Fonts This controls which fonts are used by default in the various text styles, such (Western) as for the default text and within lists. Print This option offers control over printing options specific to Writer, such as which page elements are printed (you might choose to turn off the printing of graphics, for example).
- 508. 472 CHAPTER 22 ■ OPENOFFICE.ORG OVERV IEW Table 22-2. OpenOffice.org Configuration Options (Continued) Option Description Tables Here, you can control how tables are created and how you interact with them within Writer. For example, you can control what happens when a ta- ble is resized, such as whether the entire table responds to the changes or merely the cell you’re resizing. Changes This option lets you define how changes are displayed when the track changes function is activated. Compatibility Here, you can set specifics of how Writer handles the import and export of Microsoft Word documents. AutoCaption This offers settings for the AutoCaption feature within Writer. Mail Merge E-Mail This option lets you control the sending of e-mail mail merge messages. OpenOffice.org Writer/Web View Here, you can control the HTML editor component of OpenOffice.org (effectively an extension of Writer). You can control the look and feel of the HTML editor, including which elements are displayed on the screen. Formatting Aids As with the similar entry for Writer under Text Document, this option lets you view symbols in place of usually hidden text elements. Grid This lets you define a grid that on-screen elements are able to “snap to” in order to aid accurate positioning. Print Here, you can define how HTML documents created within OpenOffice.org are printed. Table Similar to the Tables entry under Text Document, this controls how tables are created and handled within HTML documents. Background This lets you set the default background color for HTML documents. OpenOffice.org Calc General Here, you can modify miscellaneous options related to Calc, such as which measurement units are used within the program and how the formatting of cells is changed when new data is input. View This option relates to the look and feel of Calc, such as the color of the grid lines between cells and which elements are displayed on the screen. For example, you can configure whether zero values are displayed, and whether overflow text within cells is shown or simply truncated at the cell boundary. Calculate This option relates to how numbers are handled during certain types of formula calculations, such as those involving dates. Sort Lists This option lets you create lists that are applied to relevant cells when the user chooses to sort them. Several lists are predefined to correctly sort days of the week or months of the year. Changes This option relates to the on-screen formatting for changes when the track changes function is activated. Grid This option lets you configure an invisible grid that stretches across the sheet and which page objects can be set to snap to the grid for correct alignment.
- 509. C HA PTER 22 ■ OPEN OFFICE .OR G OV ERVIEW 473 Table 22-2. OpenOffice.org Configuration Options (Continued) Option Description Print This option relates to printing specifically from Calc, such as whether Calc should avoid printing empty pages that might occur within documents. OpenOffice.org Impress General This option refers to miscellaneous settings within the Impress program, such as whether the program should always start with a wizard and which units of measurement should be used. View This option relates to the look and feel of Impress, and, in particular, whether certain on-screen elements are displayed. Grid This controls whether an invisible grid is applied to the page and whether objects should snap to it. Print This option controls how printing is handled within Impress and, in particular, how items in the document will appear on the printed page. OpenOffice.org Draw General This option relates to miscellaneous settings within Draw (the vector graphics component of OpenOffice.org). View Here, you can set specific preferences with regard to which objects are visible on the screen while you’re editing with Draw. Grid This option relates to the invisible grid that can be applied to the page. Print This option lets you define which on-screen elements are printed and which are not printed. OpenOffice.org Base Connections This option lets you control how any data sources you attach to are handled. Databases Here, you can configure which databases are registered for use within Base. Chart Default Colors Here, you can set the default color palette that should be used when creating charts, usually within the Calc program. Internet Proxy Here, you can configure network proxy settings specifically for OpenOffice.org, if necessary. Search Certain functions within various OpenOffice.org programs let you search the Internet. Here, you can configure how these search functions work. E-mail This option lets you specify which program you wish OpenOffice.org to use for e-mail. Mozilla Plug-in This function allows integration of OpenOffice.org into the Mozilla and/or Netscape browsers, to allow the viewing of OpenOffice.org documents within the browser window.
- 510. 474 CHAPTER 22 ■ OPENOFFICE.ORG OVERV IEW Using OpenOffice.org Core Functions Although the various programs within OpenOffice.org are designed for very specific tasks, they all share several core functions that work in broadly similar ways. In addition, each program is able to borrow components from other programs in the suite. Using Wizards One of the core functions you’ll find most useful when you’re creating new documents is the wizard system, which you can access from the File menu. A wizard guides you through creating a new document by answering questions and following a wizard-based interface. This replaces the template-based approach within Microsoft Office, although it’s worth noting that OpenOffice.org is still able to use templates. A wizard will usually offer a variety of document styles. Some wizards will even prompt you to fill in salient details, which they will then insert into your document in the relevant areas. Getting Help OpenOffice.org employs a comprehensive help system, complete with automatic context- sensitive help, called the Help Agent, which will appear if the program detects you’re performing a particular task. Usually, the Help Agent takes the form of a light bulb graphic, which will appear at the bottom-right corner of the screen. If you ignore the Help Agent, it will disappear within a few seconds. Clicking it causes a help window to open. Alternatively, you can access the main searchable help file by clicking the relevant menu entry. Inserting Objects with Object Linking and Embedding All the OpenOffice.org programs are able to make use of Object Linking and Embedding (OLE). This effectively means that one OpenOffice.org document can be inserted into another. For example, you might choose to insert a Calc spreadsheet into a Writer document. The main benefit of using OLE over simply copying and pasting the data is that the OLE item (referred to as an object) will be updated whenever the original document is revised. In this way, you can prepare a report featuring a spreadsheet full of figures, for example, and not need to worry about updating the report when the figures change. Figure 22-4 shows an example of a spreadsheet from Calc inserted into a Writer document. Whenever you click inside the OLE object, the user interface will change so that you can access functions specific to that object. For example, if you had inserted an Impress object into a Calc document, clicking within the object would cause the Calc interface to temporarily turn into that of Impress. Clicking outside the OLE object would restore the interface back to Calc.
- 511. C HA PTER 22 ■ OPEN OFFICE .OR G OV ERVIEW 475 You can explore OLE objects by selecting Insert ➤ Object ➤ OLE Object. This option lets you create and insert a new OLE object, as well as add one based on an existing file. To ensure the inserted OLE object is updated when the file is, check the Link To File box in the Insert OLE Object dialog box. Figure 22-4. Object Linking and Embedding (OLE) lets you incorporate one OpenOffice.org document into another. Creating Macros OpenOffice.org employs a powerful BASIC-like programming language, which you can use to create your own functions. Although this language is called BASIC, it is several generations beyond the BASIC you might have used in the past. OpenOffice.org’s BASIC is a high-level, object-oriented environment designed to appeal to programmers who wish to quickly add their own functions to the suite. However, it’s possible for any user to record a series of actions as a macro, which is then automatically turned into a simple BASIC program. This can be very useful if you wish to automate a simple, repetitive task, such as the insertion of a paragraph of text, or even something more complicated, such as searching and replacing text within a document. To record a macro, select Tools ➤ Macros ➤ Record Macro. After you’ve selected this option, any subsequent actions will be recorded. All keyboard strokes and clicks of the
- 512. 476 CHAPTER 22 ■ OPENOFFICE.ORG OVERV IEW mouse will be captured and turned automatically into BASIC commands. To stop the recording, simply click the button on the floating toolbar. After this, you’ll be invited to give the macro a name (look to the top left of the dialog box). Once you’ve done so, a dialog box will appear, into which you can type a name for the macro (in the Macro Name text box). Then, click Save. You can then run your macro in the future by choosing Tools ➤ Macros ➤ Run Macro. Simply expand the My Macros and Standard entries at the top left of the dialog box, click Module1, select your macro in the list on the right, and click Run. Saving Files As mentioned in Chapter 21, OpenOffice.org uses the OpenDocument range of file formats. The files end with an .ods, .odt, .odp, or .odb file extension, depending on whether they’ve been saved by Calc, Writer, Impress, or Base, respectively. The OpenDocument format is the best choice when you’re saving documents that you are likely to further edit within OpenOffice.org. However, if you wish to share files with colleagues who aren’t running Ubuntu or OpenOffice.org, the solution is to save the files as Microsoft Office files. To save in this format, just choose it from the Save As drop-down list in the Save As dialog box. If your colleague is running an older version of OpenOffice.org or StarOffice, you can also save in those file formats. Alternatively, you might wish to save the file in one of the other file formats offered in the Save As drop-down list. However, saving files in an alternative format might result in the loss of some document components or formatting. For example, saving a Writer docu- ment as a simple text file (.txt) will lead to the loss of all of the formatting, as well as any of the original file’s embedded objects, such as pictures. To avoid losing document components or formatting, you might choose to output your OpenOffice.org files as Portable Document Format (PDF) files, which can be read by the Adobe Acrobat viewer. The benefit of this approach is that a complete facsimile of your document will be made available, with all the necessary fonts and on-screen elements included within the PDF file. The drawback is that PDF files cannot be loaded into OpenOffice.org for further editing, so you should always save an additional copy of the file in the native OpenOffice.org format. To save any file as a PDF throughout the suite, select File ➤ Export As PDF. Then choose PDF in the File Type drop-down box, as shown in Figure 22-5.
- 513. C HA PTER 22 ■ OPEN OFFICE .OR G OV ERVIEW 477 Figure 22-5. All the programs in the suite can export files in Adobe PDF format. Summary In this chapter, we looked at the configuration options provided with OpenOffice.org. You were introduced to the user interface, which is shared across all the programs within the suite, and learned how it can be customized. We also examined some common tools provided across the suite of programs, such as macro generation. Over the following chapters, we will look at each major component of the suite, starting with Writer.
- 515. CHAPTER 23 ■■■ In Depth: Writer T he word processor is arguably the most popular element within any office suite. That said, you’ll be happy to know that OpenOffice.org’s Writer component doesn’t skimp on features. It offers full text-editing and formatting functionality, along with powerful higher-level features such as mail merge. In this chapter, we’ll take a look at some of Writer’s most useful features. As with all of the components in the OpenOffice.org suite, describing the features within Writer could easily fill an entire book. You should do some exploring on your own by clicking around to discover new features, as well as make judicious use of the help system. To start Writer, click Applications ➤ Office ➤ OpenOffice.org Word Processor. Formatting Text You can format text within Writer using several methods. Here, we’ll look at using the Formatting toolbar, the context menu, and the Style and Formatting palette. The Formatting Toolbar Formatting text is easy to do via the Formatting toolbar, which is just above the ruler and main document area. Using the toolbar buttons, you can select the type of font you wish to use, its point size, and its style (normal, bold, italics, and so on). The range of fonts is previewed in the Font drop-down list, making it easy to select the right typeface. In addition, the Formatting toolbar lets you justify text so that it’s aligned to the left or right margin, centered, or fully justified. You can also indent text using the relevant icons. As with elsewhere in Ubuntu, a tooltip will appear over each icon when you hover the mouse cursor over it, as shown in Figure 23-1. To the right of the indentation buttons are tools to change the text background and foreground colors, and also a tool to create high- lighter pen-style effects. 479
- 516. 480 CHAPTER 23 ■ IN DEPTH: WRITER Figure 23-1. When you hover your mouse over an icon, a tooltip appears to explain what it does. Context Menu Rather than use the Formatting toolbar, you can format text using the context menu. Right-click the text you want to format, and a context menu will present options for the font, size, style, alignment, and line spacing. The context menu also allows you to change the case of the highlighted characters—from uppercase to lowercase, and vice versa. By selecting the Character option from the context menu, you get ultimate control over the font formatting. This will present a dialog box that includes every possible option, such as rotating the text and altering the individual character spacing (look under the Position tab for these options). ■Tip The Character dialog box lets you create interesting typographical effects. The Paragraph dialog box has many options for formatting paragraphs. These tools open up the possibility of using Writer for simple desktop publishing work. Selecting Paragraph from the context menu displays the Paragraph dialog box, as shown in Figure 23-2. This gives you control over paragraph elements, such as line spacing, indentation, and automatic numbering. Here, you will also find an option to automatically create drop caps, so you can start a piece of writing in style!
- 517. CHAPTER 23 ■ IN DEPTH: WRITE R 481 Figure 23-2. Writer includes many elements found in desktop publishing packages, such as the ability to create drop caps. The Style and Formatting Palette The Style and Formatting palette offers a variety of predefined formatting styles that you can apply to selected text or enable before you begin adding text. To make it appear, click Formatting ➤ Styles and Formatting, or press F11. You can simply click the palette’s close button to get rid of it. You can easily add your own text styles to the Style and Formatting palette. Simply select some text that has the formatting applied, click the top-right button (denoted by a paragraph symbol next to a block of text), and then select New Style from Selection in the list. You’ll be invited to give the style a name, and when you click OK, it will appear in the list. Spell-Checking Writer is able to automatically spell-check as you type. Any words it considers misspelled will be underlined in red. You can choose from a list of possible corrections by right-clicking the word and selecting from the context menu. If you’re sure the word is spelled correctly but it doesn’t appear to be in the dictionary, you can select Add ➤ Standard.dic from the context menu, as shown in Figure 23-3. This will add the word to your own personal dictionary extension (other users won’t have access to your dictionary and will need to create their own list of approved words).
- 518. 482 CHAPTER 23 ■ IN DEPTH: WRITER Figure 23-3. Any words you’re going to use frequently, but which Writer doesn’t recognize, can be added to your personal dictionary. ■Tip You might find that the spell-checker is set for US English. If you live outside the United States, or need to create documents for readers in other countries, you can choose a dictionary tailored to your locality or needs. To change the language, select Tools ➤ Options. In the list on the left, select Language Settings, and then Languages. In the Default Languages for Documents list, select your local variation. This will then become the default for all new documents. If you find live spell-checking invasive or distracting, you can deactivate it by selecting Tools ➤ Spellcheck, clicking the Options button, and removing the check next to Check Spelling As You Type. You can manually spell-check the document at any time by clicking Tools ➤ Spellcheck. This will scan through the document and prompt you for corrections for words the program considers misspelled.
- 519. CHAPTER 23 ■ IN DEPTH: WRITE R 483 Inserting Pictures Writer includes quite substantial desktop publishing–like functions, such as the ability to insert pictures into text documents and to have text flow around pictures. Inserting any kind of graphic—a graph, digital camera photo, drawing, or any other type of image—is easy. Simply choose Insert ➤ Picture ➤ From File. ■Tip If you have a scanner, you can also scan pictures directly into Writer documents. Simply click Insert ➤ Picture ➤ Scan ➤ Select Source. After you’ve inserted a picture, you can place it anywhere on the page. When you select the picture, a new toolbar appears. This toolbar contains various simple image-tweaking tools, such as those for altering the brightness, contrast, and color balance of the image. Additionally, by clicking and dragging the blue handles surrounding the image, you can resize it. Graphics that are imported into Writer must be anchored in some way. In other words, they must be linked to a page element so that they don’t move unexpectedly. By default, they’re anchored to the nearest paragraph, which means that if that paragraph moves, the graphic will move, too. Alternatively, by right-clicking the graphic, you can choose to anchor it to the page, paragraph, or character it is on or next to, as shown in Figure 23-4. Selecting to anchor it to the page will fix it firmly in place, regardless of what happens to the contents of the surrounding text. The As Character option is slightly different from the To Character option. When you choose As Character, the image will be anchored to the character it is next to, and it is actually inserted in the same line as that character, as if it were a character itself. If the image is bigger than the line it is anchored in, the line height will automatically change to accommodate it. Figure 23-4. A picture can be “anchored” to the page, paragraph, or a character. This affects how it responds to the paragraphs surrounding it.
- 520. 484 CHAPTER 23 ■ IN DEPTH: WRITER As you can see in Figure 23-4, the context menu also includes a Wrap option, which lets you set the type of text wrap you want to use. By default, Optimal Page Wrap is selected. This causes the text to wrap down just one side of the picture—the side on which the picture is farthest from the edge of the page. Alternatives include No Wrap, which will mean that the graphic will occupy the entire space on the page; no text is allowed on either side of it. However, Page Wrap is the best option if you’re looking for a desktop publishing– style effect, because the text will wrap around both sides of the picture. Alternatively, if you wish the image to appear in the background of the page with text flowing across it, you can select the relevant option from the context menu. As always within OpenOffice.org, ultimate control is achieved by opening the relevant dialog box. You can set up how graphics are treated on the page by right-clicking the image and selecting Picture. In the dialog box that appears, you can select the wrap effect, specify the invisible border around the wrap (which governs how close the text is to the image), and give the image a border frame. Working with Tables Often, it’s useful to present columns of numbers or text within a word processor document. To make it easy to align the columns, OpenOffice.org offers the Table tool. This lets you quickly and easily create a grid in which to enter numbers or other information. You can even turn tables into simple spreadsheets, and tally rows or columns via simple formulas. To insert a table, click and hold the Table icon on the Standard toolbar (which runs across the top of the screen beneath the menu). Then simply drag the mouse in the table diagram that appears until you have the desired number of rows and columns, and release the mouse button to create the table, as shown in Figure 23-5. Figure 23-5. Just select the Table icon on the Main toolbar and drag the mouse to define the size of the table. Release the mouse button when you’re finished.
- 521. CHAPTER 23 ■ IN DEPTH: WRITE R 485 Whenever your cursor is inside the table, a new toolbar will appear, offering handy options. Once again, simply hover your mouse over each button to find out what it does via a tooltip. As with spreadsheets, tables consist of cells arranged into rows (running horizontally) and columns (running vertically). Altering the size of a column is easy. Just hover the mouse over the edge of a cell until it changes to a resizing cursor, and then click and drag. You can do the same on a horizontal bar to alter a cell’s height, but a far better method is to right-click within the cell, select Row ➤ Height, and enter a value. This will ensure that subsequent cells are shifted down to make space for the newly enlarged cell, which doesn’t happen when you click and drag the cell’s border. ■Tip An alternative way of resizing cells is to click in a cell and press the Enter key, which inserts a carriage return. Cells expand in size to fit their contents. Once the cursor is within a table, you can move from cell to cell using the Tab key. Alternatively, you can move backward through the cells by pressing Shift+Tab. To add more rows or columns, click the relevant icon on the Table toolbar (the fourth and fifth buttons on the bottom row). To split an existing cell, ensure your cursor is inside it, right-click, select Cell from the menu, and then click Split. If you want to total figures within a table, click in an empty cell, and then click the Sum icon on the Table toolbar (the Greek sigma symbol on the right side of the bottom row). This is similar to inserting a function in a spreadsheet. The cell holds the formula for the sum and clicking additional cells, or a range of cells, adds them to the sum. ■Note Only correctly formatted cells can be summed using the Sum icon on the Table toolbar. Cells with spaces or text within them cannot be added to the formula. You can alter the styling of any cell using various icons on the Table toolbar, as well as the standard text formatting tools on the Formatting toolbar. The Table toolbar allows you to add borders to the cells and change the background colors. Alternatively, you can choose to remove all borders from the cells by clicking the Borders icon and then the No Borders option (note that gray borders will remain in place, but these are only for your convenience and won’t appear in printouts).
- 522. 486 CHAPTER 23 ■ IN DEPTH: WRITER Mail Merging Mail merging refers to automatically applying a database of details, such as names and addresses, to a document, so that many personalized copies are produced. It’s ordinarily used to create form letters for mailings. OpenOffice.org makes the procedure very easy, but it requires source data that will be merged into the document. As with Microsoft Word, you can either enter this data within Writer itself or choose to import data from a separate document. Unless you have enough knowledge of databases to connect one to OpenOffice.org (the program works with dBase and MySQL files, among others), you may want to input existing data in the form of a comma-separated value (CSV) text file. This is the simplest form of data file that is under- stood by the majority of office programs and databases. Here, we’re going to look at entering the data within Writer, which is the best policy for smaller mail merge operations. You can then output the data as a CSV file, so you can use it again later. Here are the steps for using mail merge (click the Next button after each step): 1. Select Tools ➤ Mail Merge Wizard to start the wizard, as shown in Figure 23-6. 2. Specify your starting document, which is the document in which the merged data will appear. You can opt to use the current document, create a new document, open a document from file, or use a template as the basis for your file. 3. Choose the mail merge type. You can choose to create a merged e-mail (for sending to multiple recipients) or a merged letter. 4. You’re asked to tell Writer about your data. Writer needs to know where to find the addresses that will be merged into the document. Click the Select Address List button. 5. In the window that appears, you have a number of options. You can raid your Evolution e-mail address book for the data, click Add to select an already existing data source (such as a database or CSV file), or create a data source from scratch. Click the Create button to create a data source to enter the data in Writer. ■Note The fourth option for choosing a mail merge data source, Filter, allows you to filter the database source you select after clicking Add, so that you can import only specific data. To learn more about this technique, browse the OpenOffice.org Help file (click Help ➤ OpenOffice.org Help) and search for Filtering ➤ Data in Databases.
- 523. CHAPTER 23 ■ IN DEPTH: WRITE R 487 Figure 23-6. The Mail Merge Wizard makes creating multiple documents from a data source incredibly easy. 6. You’re presented with a form for entering the data for each individual you want to receive the mail-merged letter, as shown in Figure 23-7. You don’t need to fill in each field; you’ll be able to choose which data fields to use in the document later on. If you wish to enter your own specific data types in addition to address details, you can click the Customize button to add your own field to the list. Using the up and down arrows in the window that appears, position the highlight where you would like the data to appear. Then click the Add button (alternatively, if there’s a data field you’re not using, you can highlight it and select Rename to reuse it). Obviously, you should add any new data fields you want before you begin to enter data! 7. Type in the data and press Enter at the end of each line. When you get to the last field, click the New button at the top right. When you’ve finished entering all the data, click OK. Then accept Writer’s offer to save the data as a CSV file. 8. You’re returned to the data-selection screen, and your just-saved file will be in the list. Click OK.
- 524. 488 CHAPTER 23 ■ IN DEPTH: WRITER Figure 23-7. Enter the data for each person you want to receive the letter. 9. You’re returned to the main Mail Merge Wizard window, where you can select whether or not to include an address block. All this means is that Writer will auto- matically add the merge fields to your document in what it considers the correct format (for example, title, followed by first and last name, with each line of the address underneath, and so on). You can insert the merge fields manually later on if you wish; in that case, remove the check from the “This document shall contain an address block” check box. Click Next. 10. You’re invited to create the salutation that will head the letter. This will contain the merge data as well, so that you can personalize the letter. Again, you can accept the default, tweak it slightly, or choose not to have an automated salutation (so that you can create your own later). 11. Depending on your previous choices, and whether you accepted the automatic address block and salutation, you are now given the choice to adjust the layout of the document in a rough way or to actually edit it (note that even if you accepted the address block and/or salutation, you’ll get a chance to edit the document in the next step anyway).
- 525. CHAPTER 23 ■ IN DEPTH: WRITE R 489 12. If you opt to edit the document, you can insert your choice of merge fields by clicking Insert ➤ Fields ➤ Other. Select the Database tab in the window that appears, and then select Mail Merge Fields on the left side of the window. Click the small plus symbol next to the data file you created earlier, which should be listed on the right, and you can then select and insert the merge fields. Once you’ve finished, click the Return to Mail Merge Wizard button. 13. Click Next to perform the merge. You’re then given a chance to edit the actual mail- merged documents (which, depending on the quantity of data entries you created earlier, could number in the tens, hundreds or even thousands!). 14. You can save or print the merged document containing the data. To save the doc- ument creating the merge fields, click Save Starting Document. Adding Headers and Footers You may want to add headers and footers to long documents to aid navigation. They appear at the top and bottom of each page, respectively, and can include the document title, page number, and other information. Headers and footers are created and edited independently of the main document. As you might expect, inserting both headers and footers takes just a couple of clicks. Select Insert ➤ Header ➤ Default or Insert ➤ Footer ➤ Default, depending on which you wish to insert (documents can have both, of course). Writer will then display an editing area where you can type text to appear in the header or footer. For more options, right-click in the area, select Page, and then click the Header or Footer tab. Here, you can control the formatting and nature of the header or footer. Clicking the More button will let you apply borders or background colors. You might wish to insert page numbers that will be updated automatically as the docu- ment progresses. OpenOffice.org refers to data that automatically updates as a field. You can insert a wide variety of fields by selecting Insert ➤ Fields, as shown in Figure 23-8. For example, along with the page number, you can insert the document title and author name (which is read from the details entered into the Options configuration dialog box, accessed from the Tools menu). In addition, you can enter mail merge fields by clicking Other (see the previous section for a description of how to associate mail merge data with a document).
- 526. 490 CHAPTER 23 ■ IN DEPTH: WRITER Figure 23-8. Automatically updating data, such as page numbers, can be inserted into headers and footers. Summary In this chapter, we’ve examined Writer, one of the core components of OpenOffice.org. We’ve looked at the some of the key tools, which enable quick and easy document creation. In particular, you’ve learned how to format text, use the spell-checking component, insert pictures, create and edit tables, mail merge, and add headers and footers. In the next chapter, we move on to another vital part of OpenOffice.org: Calc, the spreadsheet component.
- 527. CHAPTER 24 ■■■ In Depth: Calc C alc is the spreadsheet component of OpenOffice.org. Like most modern spreadsheet programs, it contains hundreds of features, many of which few average users will ever use. However, it doesn’t abandon its user-friendliness in the process and remains very simple for those who want to work on modest calculations, such as home finances or mortgage interest payments. In many regards, Calc is practically a clone of Excel, and anyone who has used Microsoft’s spreadsheet program will be able to get started with it immediately. In this chapter, you’ll learn about some of the best features of Calc, as well as the basics of spreadsheet creation. To start Calc, click Applications ➤ Office ➤ OpenOffice.org Spreadsheet. Entering and Formatting Data As with all spreadsheets, entering data into a Calc document is simply a matter of selecting a cell and starting to type. You can enter practically anything into a cell, but a handful of symbols are not allowed. For example, you cannot enter an equals sign (=) in a cell, because Calc will assume that this is part of a formula. ■Tip To enter any character into a cell, including an equals sign followed by a digit, precede it with an apostrophe (’). The apostrophe itself won’t be visible within the spreadsheet, and whatever you type won’t be interpreted in any special way; it will be seen as plain text. Entering a sequence of data across a range of cells can be automated. Start typing the sequence of numbers (or words), highlight them, and then click and drag the small handle to the bottom right of the last cell. This will continue the sequence. You’ll see a tooltip window, indicating what the content of each cell will be. Figure 24-1 illustrates this process. 491
- 528. 492 CHAPTER 24 ■ IN DEPTH: C ALC Cells can be formatted in a variety of ways. For trivial formatting changes, such as selecting a different font or changing the number format, you can use the Formatting toolbar. For example, to turn the cell into one that displays currency, click the Number Format: Currency icon (remember that hovering the mouse cursor over each icon will reveal a tooltip). You can also increase or decrease the number of visible decimal places by clicking the relevant Formatting toolbar icon. For more formatting options, right-click the individual cell, and select Format Cells from the menu. This displays the Format Cell dialog box, where you can change the style of the typeface, rotate text, place text at various angles, and so on. The Border tab of the Format Cell dialog box includes options for cell gridlines of varying thicknesses, which will appear when the document is eventually printed out. Figure 24-1. You can automate the entering of data sequences by clicking and dragging. Deleting and Inserting Data and Cells Deleting data is also easy. Just highlight the cell or cells with the data you want to delete, and then press the Delete key. If you want to totally eradicate the cell along with its contents, right-click it and select Delete Cells. This will cause the data to the sides of the cell to move in. You’ll be given a choice on where you want the cells to shift from to fill the space: left, right, above, or below. To insert a new cell, right-click where you would like to it to appear and select Insert Cells. Again, you’ll be prompted about where you want to shift the surrounding cells in order to make space for the new cell.
- 529. CHAPTER 24 ■ IN DEPTH: C ALC 493 Working with Formulas Calc includes a large number of formulas. In addition to simple and complex math func- tions, Calc offers a range of logical functions, as well as statistical and database tools. Certain formulas can also be used to manipulate text strings, such as dates. You can get an idea of the available functions by clicking the Function Wizard button on the Formula bar (which is just below the Formatting toolbar). This will bring up a cate- gorized list of formulas, along with brief outlines of what function the formula performs. If you would like more details, use the help system, which contains comprehensive descriptions of most of the formulas, complete with examples of the correct syntax. ■Note The Function Wizard is actually a continuation of the wizard system you’ve seen in other OpenOffice.org programs, and some of the functions are also available elsewhere in the suite. You can reuse formulas simply by cutting and pasting them. Calc is intelligent enough to work out which cells the transplanted formula should refer to, but it’s always a good idea to check to make sure the correct cells are referenced. Using the Function Wizard To use the Function Wizard to add a function, click the relevant button on the Formula bar, select the desired type of formula from the Category drop-down list, and then double- click an entry in the Function list to select it. Following this, you’ll be prompted to input the relevant figures or define the appropriate data sources. Next to each text-entry box is a “shrink” button, which temporarily hides the wizard window, so you can select cells to be used within the formula. Let’s look at a quick example of using the wizard to work out an average value of a number of cells. 1. Select the cell in which you want the result of the formula to appear. 2. Start the Function Wizard by clicking the button on the Formula bar. In the left-hand list of functions, double-click AVERAGE. The wizard will then present a list of fields on the right side of the dialog box, where you can enter the values to be averaged. You could type numeric values directly into these fields, but it’s more likely that you’ll want to reference individual cells from the spreadsheet. 3. Click and drag the top of the dialog box to move it so that the spreadsheet under- neath is at least partially visible.
- 530. 494 CHAPTER 24 ■ IN DEPTH: C ALC 4. Click the cursor in the “number 1” field of the dialog box, and then click the first cell you want to include in the calculation. This will automatically enter that cell ref- erence into the field. By clicking the button to the right of the field, you can roll up the dialog box to allow better access to the spreadsheet. This will then display only the dialog box field you’re entering data into. To unroll the dialog box, click the button again. 5. Click the next field in the dialog box, and then click the next cell you wish to include. 6. Repeat step 5 until all the fields you wish to include have been added to the fields in the dialog box (up to 30 can be selected; use the scroll bar on the right side of the wizard dialog box to reveal more fields). 7. Once you’ve finished, click the OK button. Calc will insert the formula into the cell you selected at the start, showing the result of the formula. After you’ve added a formula with the wizard, you can edit it manually by clicking it and overtyping its contents in the Formula bar editing area. Alternatively, you can use the Function Wizard once again, by clicking the button on the Formula bar. Summing Figures To add the values of a number of cells, you could use the Function Wizard and select the SUM function, as shown in Figure 24-2. The procedure for choosing the cells is the same as described in the previous section. However, Calc provides a far easier method of creating the sum formula. After posi- tioning the cursor in an empty cell, simply click the Sum icon (the Greek sigma character) on the Formula bar, and then select the cells you wish to include in the sum. Then press Enter to see the results. If you place the cursor in a cell directly beneath a column of numbers, Calc may be clever enough to guess what you want to add and automatically select them. If it’s incorrect, simply highlight the correct range of cells. ■Tip You can select more than one cell by holding down the Ctrl key. You can select a range of cells in succession by clicking and dragging the mouse.
- 531. CHAPTER 24 ■ IN DEPTH: C ALC 495 Figure 24-2. Creating formulas is easy using the Function Wizard. Sorting Data Within a spreadsheet, you may want to sort data according to any number of criteria. For example, you might want to show a list of numbers from highest to lowest, or rearrange a list of names so that they’re in alphabetical order. This is easy to do within Calc. Start by highlighting the range of data you wish to sort. Alternatively, you can simply select one cell within it, because Calc is usually able to figure out the range of cells you want to use. Then select Data ➤ Sort from the main menu. Calc will automatically select a sort key, which will appear in the Sort By drop-down list, as shown in Figure 24-3. However, you can also choose your own sort key from the drop-down menu if you wish, and you can choose to further refine your selection by choosing up to two more sort subkeys from the other drop-down menus.
- 532. 496 CHAPTER 24 ■ IN DEPTH: C ALC Figure 24-3. Data can be sorted so that it’s in alphabetical or numerical order. Creating Charts Charts are useful, because they present a quick visual summary of data. Calc produces charts through a step-by-step wizard, so it becomes very easy indeed. Here are the steps: 1. Highlight the data you want to graph. Be careful to include only the data itself and not any surrounding cells, or even the cell that contains the title for the array of data. 2. Select the Insert ➤ Chart menu option, or click the Insert Chart button on the Standard toolbar. 3. The cursor turns into a target with a small graph next to it. Click and drag on the spreadsheet itself to define the area of the graph. This can be any size. Also, you can resize it later. 4. The wizard starts. The first step is to define the range of cells to be used for the chart. By highlighting the cells before you started, you’ve already done this, so you can click the Next button. However, first make sure that the First Row As Label option is selected.
- 533. CHAPTER 24 ■ IN DEPTH: C ALC 497 5. Choose the type of chart you wish to use. For most simple data selections, a bar graph is usually best. However, you might also choose to select a horizontal bar graph. Then click Next. 6. The wizard presents a subselection of graph types. You can also select whether gridlines are used to separate the various areas of the graph. Make your selections and click Next. 7. The last step allows you to give the chart a title and also choose whether you want a legend (a key that explains what the axes refer to) to appear next to it. 8. Click Create, and the chart will be created. Figure 24-4 shows an example. Figure 24-4. Creating a chart is easy within Calc and adds a professional flourish to your spreadsheet. Once you’ve created a chart, you can alter its size by clicking and dragging the handles. You can also change various graphical aspects by double-clicking them. However, keep in mind that the graph is actually a picture, so the properties you edit are limited to changing the color and size of various elements. The chart is linked to your data. Whenever your data changes, so will your chart. This is done automatically and doesn’t require any user input.
- 534. 498 CHAPTER 24 ■ IN DEPTH: C ALC Using Filters The Filter function in Calc lets you selectively hide rows of data. The spreadsheet user then selects which of the rows of data to view from a drop-down list that appears in the cell at the top of the rows, as shown in the example in Figure 24-5. Figure 24-5. Filters allow you to selectively hide or show rows of data in a spreadsheet. ■Note A Calc filter is a little like an Excel pivot chart, especially when it’s combined with an automatically generated chart. Using filters in this way can be useful when you’re dealing with a very large table of data. It helps isolate figures so you can compare them side by side in an easy-to-follow format. For example, you could filter a table of sales figures by year. To use the Filter function, start by highlighting the data you wish to see in the drop- down list. Make sure the column header for the data is included, too. If you’re using the Filter feature on a table of data, this selection can be any column within the table, although it obviously makes sense to use a column that is pertinent to the filtering that will take place. After you’ve selected the data to filter, select Data ➤ Filter ➤ Autofilter. You should find that, in place of the column header, a drop-down list appears. When a user selects a various entry in the list, Calc will display only the corresponding row of the spreadsheet beneath. To remove a filter, select Data ➤ Filter ➤ Remove Filter.
- 535. CHAPTER 24 ■ IN DEPTH: C ALC 499 Summary In this chapter, we examined OpenOffice.org Calc. We looked at the basics of how data can be entered into a cell and how it can be formatted. Then you learned how to create formulas. This is easy to do with the Function Wizard function, which automates the task. Next, you saw how to sort data in a spreadsheet. We also went through the steps for creating charts using a Calc wizard. Finally, we looked at creating data filters, which work rather like pivot charts in Microsoft Excel. In the next chapter, we move on to Impress, the presentations component of OpenOffice.org.
- 537. CHAPTER 25 ■■■ In Depth: Impress Impress is the presentation package within OpenOffice.org. At first glance, it appears to be the simplest of the key OpenOffice.org components, and also the one that borrows most the look and feel from Microsoft Office. However, delving into its feature set reveals more than a few surprises, including sophisticated animation effects and drawing tools. Impress can also export presentations as Adobe Flash–compatible files, which means that many Internet-enabled desktop computers around the world will be able to view the files, even if they don’t have Impress or PowerPoint installed on their computers. In this chapter, you’ll learn about the main features of Impress, as well as the basics of working with presentations. You can start the program by clicking Applications ➤ Office ➤ OpenOffice.org Presentation. Creating a Quick Presentation As soon as Impress starts, it will offer to guide you through the creation of a presentation using a wizard. This makes designing your document a matter of following a few steps. You’ll initially be offered three choices: Empty Presentation, From Template, or Open Existing Presentation. When Impress refers to templates, it means presentations that are both predesigned and also contain sample content. Only two templates are supplied with Impress, so this option is somewhat redundant. However, you might choose to look at them later, if only to get an idea of what a presentation consists of and how it’s made. ■Tip When you become experienced in working with Impress, you can create your own templates or down- load some from the Internet. To create your own template, simply select to save your document as a template in the File Type drop-down list in the Save As dialog box. Make sure you place any templates you download or create in the /usr/lib/openoffice/share/template/en-US/presnt/ directory (you will need to have superuser powers to do this and should make sure the file permissions are readable for all users). 501
- 538. 502 CHAPTER 25 ■ IN DEPTH: IMPRES S The standard way of getting started is to create an empty presentation. This sounds more daunting than it actually is, because the Presentation Wizard will start, asking you to choose from a couple of ready-made basic designs, as shown in Figure 25-1. You’ll also be given a chance to choose which format you want the presentation to take: whether it’s designed primarily to be viewed on-screen or printed out. Figure 25-1. The Impress Presentation Wizard guides you through the creation of a new presentation. After this, you’ll be invited to choose the presentation effects, including the transition effect that will separate each slide when the presentation is viewed and the speed of the transition. If you wish, you can set the pause between slides, too, as well as the length of time each slide stays on the screen. After clicking the Create button in the wizard, Impress will start, and you’ll be invited to choose a layout for your initial slide. These are previewed on-screen on the right side of the program window. A variety of design templates are available, ranging from those that contain mostly text to those that feature pictures and/or graphs.
- 539. C HA PTER 25 ■ IN DEPT H : IM PR ESS 503 Depending on which template you choose, you should end up with a handful of text boxes on your screen. Editing the text in these is simply a matter of clicking within them. The formatting of the text will be set automatically. ■Tip You can move and shrink each text box by clicking the handles surrounding the box. To draw a new text box, select the relevant tool on the Drawing toolbar, which runs along the bottom of the screen. Simply click and drag to draw a box of whatever size you want. Working in Impress When the Presentation Wizard has finished and Impress has started, you’ll notice three main elements in the program window, from left to right, as shown in Figure 25-2. You work in these panes as follows: Slides pane: This pane shows the slides in your presentation in order, one beneath the other. Simply click to select whichever slide you want to work on, or click and drag to reorder the slides. To create a new slide, right-click in a blank area on the Slides pane. Right-clicking any existing slide will present a range of options, including one to delete the slide. Main work area: This is in the middle of the program window and lets you edit the various slides, as well as any other elements attached to the presentation, such as notes or handout documents. Simply click the relevant tab. Tasks pane: Here, you can access the elements that will make up your presentation, such as slide templates, animations, and transition effects. Select the slide you wish to apply the elements to in the Slides pane, and then click the effect or template you wish to apply in the Tasks pane. In the case of animations or transitions, you can change various detailed settings relating to the selected element. In addition, Impress has a Drawing toolbar, which appears at the bottom of the screen. This lets you draw various items on screen, such as lines, circles, and rectangles, and also contains a handful of special-effect tools, which we’ll discuss later in this chapter, in the “Applying Fontwork” and “Using 3D Effects” sections. You can hide each on-screen item by clicking the View menu and then removing the check next to it. Alternatively, by clicking the vertical borders between each pane, you can resize the pane and make it either more or less prominent on screen. This is handy if you wish to temporarily gain more work space but don’t want to lose sight of the previews in the Slides pane, for example.
- 540. 504 CHAPTER 25 ■ IN DEPTH: IMPRES S Figure 25-2. The main Impress window is split into three elements: the Slides pane, main work area, and the Tasks pane. Animating Slides All elements within Impress can be animated in a variety of ways. For example, you might choose to have the contents of a particular text box fly in from the edge of the screen during the presentation. This can help add variety to your presentation, and perhaps even wake up your audience! Setting an animation effect is simply a matter of clicking the border of the object you wish to animate in the main editing area so that it is selected, selecting Custom Animation in the Tasks pane, and then clicking the Add button. In the dialog box that appears, select how you want the effect to work. As shown in Figure 25-3, you have four choices, each with its own tab within the dialog box: Entrance: This lets you animate an appearance effect for the selected object. For example, you can choose to have a text box dissolve into view or fly in from the side of the screen. When you select any effect, it will be previewed within the main editing area.
- 541. C HA PTER 25 ■ IN DEPT H : IM PR ESS 505 Emphasis: This gives you control over what, if anything, happens to the object while it’s on screen. As the name suggests, you can use this animation to emphasize various elements while you’re giving the presentation. Some emphasis effects are more dramatic than others, and this lets you control the impact. If you want to make an important point, you can use a dramatic effect, while more moderate information is presented with a more subdued effect. Exit: As you might expect, this lets you add an exit animation to the object. You might choose to have it fly off the side of the screen or spin away off the top of the screen. The animation choices here are identical to the Entrance choices. Motion path: This makes the selected element fly around on screen according to a particular path. For example, selecting Heart will cause the element to fly around describing the shape of a heart, eventually returning to its origin. A motion path is effectively another way of emphasizing a particular object. ■Note You can apply only one effect at a time to an object, although several separate effects can be applied to any object. Figure 25-3. A wide variety of animation effects is available for on-screen elements.
- 542. 506 CHAPTER 25 ■ IN DEPTH: IMPRES S With each animation, you can select the speed you wish it to play at, ranging from Very Slow to Fast. Simply make the selection at the bottom of the dialog box. Once the animation has been defined and you’ve clicked OK, it will appear in a list at the bottom of the Custom Animation pane. You can choose to add more than one anima- tion to an object by clicking the Add button again (ensuring the object is still selected in the main editing area). The animations will play in the order they’re listed. You can click the Change Order up and down arrows to alter the order. To fine-tune an effect you’ve already created, double-click it in the list to open its Effect Options dialog box (you can even add sound effects here). Under the Timing tab, you can control what cues the effect, such as a click of a mouse, or whether it will appear in sequence with other effects before or after in the list. Applying Fontwork The Fontwork tool lets you manipulate text in various playful ways, such as making it follow specific curved paths. You can find this tool on the Drawing toolbar, located at the bottom of the program window. It’s the icon that’s an A in a picture frame. When you click the icon, the Fontwork Gallery dialog box appears, offering a choice of predefined font effects. Don’t worry if they’re not quite what you want, because after you make a choice, you’ll be invited to fine-tune it. Once you’ve made the selection, the dummy text “Fontwork” will appear on screen. Editing the text is simple: just double-click the “Fontwork” text and type your own words. When you’ve finished, click outside the Fontwork selection. Whenever the new Fontwork item is selected, one or two floating toolbars will appear, as shown in Figure 25-4. You can use these toolbars to alter various options. For example, you can select a completely different Fontwork selection from the gallery or, by clicking the second icon on the left on the Fontwork toolbar, select your own path that you want the Fontwork item to follow. If the Fontwork type is three-dimensional, the 3D-Settings toolbar will let you alter the perspective, texture, and lighting. For more info on the options available, see the “Using 3D Effects” section. You’ll also see that the Formatting toolbar running along the top of the program window changes to allow you to alter the formatting of the Fontwork element. You can alter the thickness of the letter outlines, for example, or the color of the letters. Once again, the best way to learn how the tool works is to play around with the options and see what you can achieve. To remove a Fontwork item, just select its border and press the Delete key on your keyboard.
- 543. C HA PTER 25 ■ IN DEPT H : IM PR ESS 507 Figure 25-4. The Fontwork tool can add some special effects to your presentations. Using 3D Effects In addition to Fontwork effects, Impress includes a powerful 3D tool, which can give just about any on-screen element a 3D flourish (this tool is also available in some other OpenOffice.org applications). To use it, create a text box or shape using the Drawing toolbar at the bottom of the screen. Then right-click the text box or shape and select Convert ➤ 3D. ■Note The 3D option is designed simply to give your object depth. If you want to create a genuine 3D object that you can rotate in 3D space, select the 3D Rotation Object.
- 544. 508 CHAPTER 25 ■ IN DEPTH: IMPRES S You can gain much more control over the 3D effect by right-clicking it and selecting 3D Effects. This will open a floating palette window with five configuration panels, as shown in Figure 25-5. Click the icons at the top of the palette to adjust the type of 3D effect and its lighting, as follows: Geometry: This defines how the 3D effect will look when it’s applied to on-screen selec- tions. For example, you can increase or decrease the rounded-edges value, and this will make any sharp objects on the screen appear softer when the 3D effect is applied. Shading: This affects not the actual texture of the 3D object, but instead alters its color gradient. This is best demonstrated in action, so select the various shading modes from the drop-down list to see the effect. In addition, you can choose whether a shadow is applied to the effect, as well as the position of the virtual camera (the position of the hypothetical viewer looking at the 3D object). Illumination: This lets you set the lighting effect. All 3D graphics usually need a light source, because this helps illustrate the 3D effect; without a light source, the object will appear flat. Various predefined light sources are available. You can click and drag the light source in the preview window. Textures: This affects how the textures will be applied to the 3D object. A texture is effectively a picture that is “wrapped around” the 3D object. Clever use of textures can add realism to a 3D object. A map of the world applied to a sphere can make it look like a globe, for example, or you could add wood or brickwork textures to make objects appear as tabletops or walls. Material: This lets you apply various color overlays on the texture. This can radically alter the texture’s look and feel, so it is quite a powerful option. To change the texture itself, right-click the object and select Area. This will present a list of predefined textures. Alternatively, you can select to use a color or pattern. To apply any changes you make, click the check button at the top right of the palette. As with the other presentation effects, the best policy is simply to experiment until you’re happy with the results.
- 545. C HA PTER 25 ■ IN DEPT H : IM PR ESS 509 Figure 25-5. You can fine-tune 3D objects to quite a high degree using the 3D Effects palette. Exporting a Presentation As a Flash File If you plan to put your presentation online, or you want to send it to a colleague who doesn’t have Impress or PowerPoint installed, outputting your presentation as a Flash animation could be a good idea. The process is simple. Just select File ➤ Export, and then select Macromedia Flash (SWF) in the File Format drop-down list (SWF is the Flash file type, which stands for Shockwave Flash). No further configuration is necessary. In order to play the file, it needs to be opened within a web browser that has the Flash Player installed. This can be done by selecting File ➤ Open on most browsers, although you can also drag-and-drop the SWF file onto the browser window under Microsoft Windows. There shouldn’t be much of a problem with compatibility, since the Flash Player is ubiquitous these days. If the web browser doesn’t already have Flash installed, it’s easy to download and install it (see www.adobe.com/shockwave/download/download.cgi? P1_Prod_Version=ShockwaveFlash). When the Flash file is opened in a web browser, the presentation starts, as shown in Figure 25-6. You can progress through it by clicking anywhere on the screen.
- 546. 510 CHAPTER 25 ■ IN DEPTH: IMPRES S Figure 25-6. You can save any presentation as a Flash animation, which can be played back in a suitably equipped web browser. Summary In this chapter, we examined Impress, which is the presentations component within OpenOffice.org. We started by looking at how you can use the Presentation Wizard function to automate production of a basic Impress document. Then you saw how various effects can be added to the presentation, including 3D effects. Finally, we looked at how the presentation can be exported as a Shockwave Flash file for playback on virtually any web browser. In the next chapter, we will explore the database component within OpenOffice.org: Base.
- 547. CHAPTER 26 ■■■ In Depth: Base O penOffice.org includes a number of tools to both interface with database servers and perform tasks such as enter and edit data. However, for most day-to-day users who have humble needs, creating such a setup is rather complicated. It requires some knowledge of how databases work on a technical level. For this reason, a new component was added to OpenOffice.org 2.0: Base. Base is a relational database along the lines of Microsoft Access and is perfect for data- base applications of all sizes, including more modest efforts. For example, you could use it to create an inventory database to produce a report showing all products added for a certain geographical region on a certain date, or you could use it to catalog items in your personal stamp collection. Relational databases such as those created by Base are ideal for quickly creating catalogs of information, such as inventory lists. In addition to making database creation simple and quick, relational databases let you easily query data to produce reports tailored to indi- vidual needs. Base works on a number of levels depending on the knowledge of the user, but in its most basic form, it offers a design-based approach to the creation of tables and forms. Anyone who has previously created a database under Access will feel right at home. In this chapter, we’ll work through an example of using Base to create a simple data- base cataloging a collection of music. You can use the same techniques to create any kind of relational database. Getting Started with Base Unfortunately, Base isn’t installed on your Ubuntu system by default. You can download and install it by clicking System ➤ Administration ➤ Synaptic Package Manager. Click the Search button on the toolbar and type openoffice.org-base into the text box. In the list of results, click the empty check box alongside openoffice.org-base (don’t click the other results!) and click Mark for Installation. You’ll see a dialog box informing you that some additional programs need to be installed—this is fine. Click the Mark button in the dialog box to dismiss it. Then click the Apply button on the main toolbar, and the Apply button 511
- 548. 512 CHAPTER 26 ■ IN DEPTH: B ASE in the subsequent dialog box that appears. Once the program has been downloaded and installed, close the Synaptic Package Manager. Once installed, you’ll find Base under the Applications ➤ Office menu. When the program first starts, the Database Wizard guides you through either creating a new data- base or opening an existing one, as shown in Figure 26-1. Once you’ve made your choice, click Next to continue. The first step in creating a new database is to register it within OpenOffice.org. This means that it will be made available in other OpenOffice.org programs, such as Calc or Writer. Although the knowledge needed to use a database in this way is quite advanced, there’s no harm in agreeing to this option. It might prove useful in the future as you learn more about OpenOffice.org. Following this, you can choose to open the database for editing and/or start the Table Wizard. Once you click the Finish button, you’ll be invited to give the database a name and save it immediately. Figure 26-1. Base starts with the Database Wizard to facilitate the quick and easy creation of new databases. ■Note Databases aren’t like other office files in that they automatically save and update themselves. When using the finished database, you can simply enter data and then quit the program, without needing to deliberately opt to save the file.
- 549. CHAPTER 26 ■ IN DEPTH: B ASE 513 Assuming that you did not opt to go directly to the Table Wizard, you’ll now see the main Base program window. The right of the Base program window contains the Tasks and Data panes. The Tasks pane allows you to create new database elements, depending on what’s selected in the Database pane. The Data pane shows any elements you’ve already created, and its content changes depending on whether you have the Tables, Queries, Forms, or Reports mode selected in the Database pane, on the left. The components of the Database pane relate to the four typical elements of a database, and they are as follows: Tables: A table is what holds the actual data you’ll eventually input. Therefore, a table is the first thing that needs to be created within a new database. Creating a table involves defining the types of data that you want to store and giving the individual data fields easy-to-understand names. Forms: Although it’s possible to enter data directly into a table, it isn’t particularly intu- itive or easy. Because of this, forms are used to make the data fields presentable. As the name suggests, in terms of layout these are not unlike the paper forms that you fill in to facilitate the collection of data by businesses. As with tables, forms must be created from scratch in a new database. Forms have controls, which are used to facilitate data entry, or to allow users to navigate the database or otherwise manipulate it. The most common type of control is a text-entry field, which is then tied to a data field within the table, but you can also have controls that perform certain functions, such as deleting a record in the database. Queries: A query is a way of filtering the database so that you see only a subset of it. For example, in a database detailing sales figures from across the country, you might create a query to show only the data from a particular state. Reports: A report is a way of presenting data for human consumption, usually in a printed format. For example, you could create a report that details sales figures in the form of a letter, or you might make a report to produce address labels using addresses stored in the database. ■Note The usefulness of both queries and reports are that they can be saved and used over and over again, so you could use the same query each month to examine just a small section of the data. Base offers wizards to automate the creation of both queries and reports. Double-clicking an item in the Database pane displays or activates that item. Right- clicking a Database pane item displays a variety of options related to editing the file. Now, let’s work through an example of using Base. First, you’ll create a table, and then you’ll create a form.
- 550. 514 CHAPTER 26 ■ IN DEPTH: B ASE Creating a Database As an example of using Base, you’ll build a database, ready for data entry. The first step in the creation of a database is to make a table. This will hold the data that you will eventually enter using a form. Adding a Table As with all components within Base, you can use a wizard to create the table. The Table Wizard offers a number of predefined data fields corresponding to typical databases. It is fine for general use, but if you have a specific and unusual database in mind, you will need to create the table manually. Here, you’ll create a database to catalog CDs. This is easily accomplished with the Table Wizard, as follows: 1. Click the Tables icon in the Database pane, and then click the Use Wizard to Create Table icon. The Table Wizard starts. 2. You’re given a choice between creating a business or personal database. As you would expect, business databases are likely to contain fields relating to business matters, such as accounting, and the fields in the personal section relate more to domestic matters. Choose Personal for this example. 3. Choose an entry from the Sample Tables drop-down list. For this example, select CD Collection. 4. In the Available Fields box, you now see a number of data fields that would prove handy for a CD collection. You don’t need to use all of these. Instead, select only those you want in your table, and then click the single right-facing arrow button to transfer them to the Selected Fields box. For this example, select AlbumTitle, Artist, ReleaseYear, and Review, as shown in Figure 26-2. Then click the Next button. (Don’t worry if you find the fields lacking or if you want to add your own—you’ll see how to do just that in step 6). 5. Check to make sure the fields you selected are of the correct type. Click each to see the information in the right area of the dialog box. Fields can take various forms depending on what kind of data they’re supposed to hold. For example, one field might be designed to contain text, while another might need to contain numbers. Yet another might need to contain dates, and some can even contain pictures. As you might expect, the wizard has automatically selected the correct data types for the predefined fields.
- 551. CHAPTER 26 ■ IN DEPTH: B ASE 515 Figure 26-2. The Table Wizard contains ready-made data fields for a wide variety of uses. 6. For this example, you want to add a check box that shows whether the CD is scratched. If the CD in question is scratched, the user can click in a check box. If the CD isn’t scratched, the box can be left blank. To create a check box, you need a special kind of data field called a Boolean. This means that the data field can be either true or false or, to put it a simpler way, it can hold either yes or no. To create a yes/no data field, click the plus button at the bottom of the Selected Fields box. This allows you to add another field. In the Field Name box, type Scratched. For the Field Type, click the drop-down list and locate the entry marked Yes/No [BOOLEAN]. The other options can remain as they are. Click Next to continue. 7. You’re asked if you want to create a primary key. This is the unique numeric field that the database uses to keep track of each entry in the database. It’s a must in a database like this one. The default choices are correct, so you can click Next again. 8. You’ve completed the Table Wizard. The next step is to create a form, so select Create a Form Based on This Table, and then click the Finish button.
- 552. 516 CHAPTER 26 ■ IN DEPTH: B ASE Creating a Form Forms are present in databases for the benefit of users to facilitate the quick-and-easy entry of data. They present data fields that you’ve just created within the table in an easy- to-understand form. Base is able to walk you through the creation of forms via the Form Wizard. If you didn’t select to run the Form Wizard previously, you can start it by clicking Forms in the Database pane, and then clicking Use Wizard to Create Form. Then follow these steps: 1. In the Form Wizard’s first step, select which fields you want to appear on the form. As with the Table Wizard, this is simply a matter of selecting the fields and then clicking the right-arrow button so that they appear under the Fields on the Form heading. Alternatively, by clicking the double-arrow button, you can select all of them in one fell swoop, which is what you want for this example. Click Next. 2. You’re asked if you want to create a subform. As its name suggests, this is effectively a form within your main form. A subform is useful with more complicated data- bases, where it might be necessary to view other data while filling in the form. For this simple example, leave the Add Subform box unchecked and click Next. 3. Choose a general layout for the data fields. The default is the table view, which many find ugly, so you might choose one of the first two options (in our database we chose the second option, as can be see in Figure 26-3). These arrange the data fields in a spacious manner and make the form much more usable. If you look behind the wizard dialog box, you’ll see a preview of how the form will look. Once finished, click Next. 4. You’re asked whether or not you want existing data to be displayed on the form. You can choose to treat the form as one created only for entering new data, so that you can’t use it to navigate through the database and see existing data you’ve already entered. This might be useful in applications where you don’t want users to see the other data in the database. However, for a database for your own personal use, being able to see the existing data is very handy, which is why The Form Is to Display All Data option is selected by default. For this example, simply click the Next button to accept the default. 5. Choose a look and feel for your form from the variety of color schemes available, as shown in Figure 26-3. Again, you can see them previewed behind the wizard dialog box. Feel free to experiment with the options under the Field Border heading. We prefer the 3D Look option, which gives the form elements a slight interior shadow, a common feature on most modern user interfaces. The Flat option simply adds a black border to the boxes, and the No Border option removes the border completely. Once you’ve made your choices, click Next.
- 553. CHAPTER 26 ■ IN DEPTH: B ASE 517 Figure 26-3. You can choose from a variety of look and feel options for your form, and each will be previewed behind the wizard dialog box. 6. You’re invited to give the form a name. Enter a suitable name, such as CD-Collection. You are also given the option of entering data directly into the form or modifying it manually. Once you’ve made your choice, click the Finish button. The database is almost ready for use. You just need to take one more step to modify the table. However, first we’ll take a brief look at adding custom controls to forms. ■Note There are no rules governing form names, and you can use virtually any symbols and also insert spaces into the name. However, it’s a good idea to keep the form name simple and concise. Adding Controls to the Form Manually Although the form created by the wizard is good enough for our needs, there might be some instances where you want to edit the form manually to add your own controls. The following instructions describe how:
- 554. 518 CHAPTER 26 ■ IN DEPTH: B ASE 1. Double-click the form to edit it and then ensure the Form Controls toolbar is visible— click View ➤ Toolbars ➤ Form Controls. Then, on the Form Control toolbar, click the icon that represents the control you want to add to the form. Don’t forget, you can hover your mouse over each icon to see a tooltip explaining what the icon is for. Next click and drag on the form to add the item. You need to make the item big enough so that the label can be seen. This is especially relevant in the case of smaller items, such as check boxes. If you release the mouse button too early, simply click and drag the handles at the edges to resize the control. 2. Once the item has been drawn, double-click it. This will open Properties dialog box. Click in the Label box, delete what’s there already, and type the word(s) that will help the database users identify the item. 3. Click the Data tab and, in the Data Field box, select from the drop-down list the table data field that you wish to asssociate with the item. 4. Close and save the form. You can add many custom controls following the same basic approach you used here. Simply draw them on to the form, and then match them up with an entry in the table using the Data tab. Editing the Database Table Before you can use the CD database we created earlier, you need to make a small change to the table you created. Although the Table Wizard created a primary key, it didn’t make it into an automatically updating number. Without this option activated, the user will need to manually number each entry in the database as it’s created. Follow these steps to edit the table and activate automatic numbering for the ID field: 1. Click the Tables icon in the Database pane of the main program window, right-click the table you created earlier, and select Edit. 2. Look for the entry in the table list labeled ID. It should be first in the list. Make sure that the cursor is on the ID line, and click the Autovalue drop-down list at the bottom of the window. Make sure that it reads Yes, as shown in Figure 26-4. 3. Close the window and opt to save the table. That’s it! Your database is now ready to use.
- 555. CHAPTER 26 ■ IN DEPTH: B ASE 519 Figure 26-4. Set the primary key to automatically update by editing its value in the table. Using the Database Entering data into the finished database is easy. Click the Forms icon in the Database pane, and then double-click the form you created earlier. The Form Control toolbar will still be visible. To hide it, click its close button at the top- right corner of the toolbar. After this, you can start to enter data into the form, as shown in the example in Figure 26-5. Note that you do not need to enter data in the ID field, because this will automatically be filled with the primary key number. Once you’ve filled in the form, you can click the Next Record button in the Form Navigation toolbar running along the button of the window (don’t forget that hovering the mouse cursor over each button reveals a tooltip explaining what the button does). This will move you on to the next blank form, where you can enter more data. Repeat this as many times as necessary. The Form Navigation toolbar contains other handy tools. For example, the first button— a magnifying glass—lets you search the database for a particular entry. It’s well worth investigating the functions.
- 556. 520 CHAPTER 26 ■ IN DEPTH: B ASE Figure 26-5. The finished database form lets you enter data into the input fields and navigate using the toolbar at the bottom. Summary In this chapter, we looked at the Base database component of OpenOffice.org and how to use it to easily create and edit simple databases. We stepped through an example of setting up a database table and creating a database form that users can employ to enter and edit data. In the next chapter, we will look at Evolution, the powerful e-mail and personal infor- mation manager offered under Ubuntu.
- 557. CHAPTER 27 ■■■ In Depth: Evolution T he Evolution program isn’t part of the OpenOffice.org suite. It was originally created by Ximian, an organization founded by the creators of the GNOME Desktop Project and acquired by Novell in August 2003. Even long after the acquisition, Evolution is still being improved by many of the key GNOME desktop developers. Although it’s not explicitly described as such by its developers, Evolution is considered the “official” GNOME desktop e-mail program. The Evolution interface retains the same look and feel as many elements of the Ubuntu desktop. In terms of functionality, Evolution is similar to Microsoft Outlook. As well as being a powerful e-mail client, it incorporates contacts management, a calendar, a to-do list, and a memo function. Evolution is even able to connect to Microsoft Exchange (2000 and later) groupware servers and synchronize with contact and calendar data, in addition to fetching e-mail. Of course, it can also connect to standard POP3/SMTP e-mail servers, as well as IMAP, Novell GroupMail, and a handful of other mail server technologies. This means it is compatible with practically every e-mail system in use today. For more details about how to set up Evolution, see Chapter 8. Although Evolution offers many of the functions of Microsoft Outlook, it differs in some key ways. This chapter describes how to use Evolution’s main features. Evolution Modes Evolution consists of five components: Mail, Contacts, Calendars, Memos, and Tasks. These are interconnected but operate as separate modes within the program. Each mode can be selected using the switcher located at the bottom-left side of the program window. Simply click the button for the mode you wish to use. The program window, toolbar, and menu system will change to accommodate whichever mode is selected. Figure 27-1 shows the program in the default Mail mode. 521
- 558. 522 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON ■Tip You can shrink the switcher component to small icons by clicking View ➤ Switcher Appearance ➤ Icons Only. Figure 27-1. You can switch between Evolution’s modes by clicking the buttons at the bottom left of the program window. The five Evolution modes work as follows: Mail: The e-mail component is at the heart of Evolution, and all the functions you might be used to are provided. Once the Mail mode is selected, at the top left of the program window, you’ll find the mail folders. These include the Inbox and Sent folders, along with any other mail folders you create. On the right is the list of e-mail messages, and beneath this is the message preview pane, where the body of any message you select will be displayed. Above the message list is the search box, which works like most e-mail search routines: type the relevant word(s) and press Enter. Notable icons running along the top of the window include the New button, which will let you compose an e-mail message, and the Send/Receive button, which will download new messages and also send any messages in the Outbox folder.
- 559. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 523 Contacts: Tied in with the mail function but acting as a separate and very powerful entity on its own, the Contacts mode lets you store every pertinent detail about colleagues, friends, and others. Once the mode is selected, at the left side of the program window, you’ll see the various contact folders. For most users, there will be just one, named Personal, but if you specified a groupware server during setup, you will also be able to connect to this by clicking its entry. At the top right is the list of contacts. Clicking any contact displays that individual’s information at the bottom of the window, in the contact information area. The search bar at the top of the window beneath the toolbar lets you quickly search for contacts by name. The New button on the toolbar lets you create a new contact, where you can enter a wealth of data. To edit an existing entry, double-click its entry and fill in the additional details. Calendars: The Calendars mode is arguably Evolution’s second most useful function. You can add events in half-hour increments, and view your schedule in day, week, and month views by clicking the relevant button on the toolbar. Once the mode is selected, at the top left of the program window, you’ll find the various calendars you can access. For most users, the Personal calendar will be the principal one, but you can also access shared calendars here. Assuming the default day view is in operation, beneath this you’ll see the monthly calendar and, in the middle of the program window, the appointment list, with half-hour entries covering the working day. By default, the current day is shown. To select a different day, simply double-click the day in the month view. You can switch among day, week, and month appointment views by clicking the Day, Work Week, and Month buttons on the toolbar. On the right of the window, any tasks and memos that have been created are displayed, as described next. Memos: The best way to think of Evolution’s Memos mode is as a personal notepad. Once the Memos mode is selected, the list of memos will appear on the right side of the screen, and the contents of the memo at the bottom. Memos can consist of virtu- ally any amount of text, along with attachments. They’re ideal for jotting notes during phone calls, for example. Tasks: Effectively, this is a simple to do list. Once the mode is selected, your tasks will be listed on the right side of the program window. Beneath this will be details of any selected task. Basic E-Mail Tasks Evolution’s e-mail functionality is arguably the heart of the program. Although it offers a lot of features, it is quite simple to use. If you’ve ever used any other mainstream e-mail client, such as Microsoft Outlook, you have a head start.
- 560. 524 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON This section describes how to accomplish several everyday tasks within the e-mail component of Evolution. When you start Evolution, the e-mail mode is selected automat- ically. However, if it isn’t, or if you’ve switched to a different mode within the program, simply click the Mail button at the bottom left of the program window. Sending and Receiving E-Mail Once Evolution has been set up correctly to work with your e-mail servers, as outlined in Chapter 8, you can simply click the Send/Receive button on the toolbar to connect to the server(s) and both send and receive e-mail. You may need to enter your password if you didn’t enter it during setup. You can check the Remember Password box to avoid having to type it again, but this will mean the pass- word is stored on your hard disk, posing a security risk if other people have access to your PC. ■Note Although e-mail is normally sent as soon as you click the Send button when composing it, if the sending has been delayed for any reason (such as being offline at the time), it will be sent as soon as you click the Send/Receive button. Until that point, it will be held in the Outbox folder on the left side of the program window. Any outstanding mail is sent first, and then the receiving procedure is started. As shown in Figure 27-2, a status dialog box will tell you how many messages there are and the progress of the download. Clicking the Cancel button will stop the procedure (although some messages may already have been downloaded). When you get a new e-mail, an envelope icon blinks in the notification area in the top right of the desktop, and a small window appears to tell you that you have mail. Figure 27-2. You’ll see a progress display whenever you click the Send/Receive button.
- 561. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 525 E-MAIL SIGNING AND ENCRYPTION In Chapter 9, you learned how to use the Seahorse application to set up a public key pair. This allows you to encrypt e-mail messages destined for other people, so that only they can read the messages (provided you have their public key), and digitally sign your own e-mail, so recipients can be sure messages came from you (provided they have your public key). If you’ve followed the instructions to set up the key pair, you now need to configure Evolution to use it. After doing this, and when you send a new e-mail message, you can select whether you wish to encrypt the e-mail and/or digitally sign it. Remember that setting up encryption is not obligatory, and relatively few people in the wider world use e-mail encryption or signing. Assuming you’ve already set up an account within Evolution, here’s the procedure for configuring Evolution for encryption and digital signing: 1. Click Edit ➤ Preferences, ensure the Mail Accounts icon is selected on the left side of the window, and select your mail account in the list on the right side of the window. Then click the Edit button. In the dialog box that appears, click the Security tab. 2. You now need to find your PGP key ID using Seahorse. Click Applications ➤ Accessories ➤ Passwords and Encryption Keys. Locate your key in the list under the My Personal Keys tab, and look under the Key ID heading. You should see an eight-character hexadecimal number, like F0C1B52A. Write this down, remembering that any 0 you see is a zero, and not the letter O. 3. Switch back to the Evolution dialog box and type the PGP key ID you found into the PGP/GPG Key ID box. If you wish every e-mail message you send to be digitally signed automatically, which is a good idea (the message itself won’t be encrypted, so even if the recipients are not using encryption, they will still be able to read it), put a check in the Always Sign Messages When Using This Account box. Then click OK. Encrypting outgoing messages, or signing them if you haven’t selected to automatically do so, is easy. When composing a new message, click the Security menu entry and select either or both PGP Sign and PGP Encrypt. Remember that you’ll need to have imported the recipient’s public key via Seahorse if you want to encrypt a message addressed to that person, or you’ll see an error. If you sign a message, upon sending it, you’ll be prompted to enter the PGP passphrase you entered when you created the key pair back in Chapter 9. If upon sending an e-mail message, you see the error message “Failed to execute GPG: Broken pipe,” it’s likely you mistyped your key ID when you configured Evolution. Try again. If you receive a message that has been encrypted using your public key, Evolution will automatically prompt you to enter your PGP passphrase to decrypt it. This is the passphrase you entered when creating your key pair back in Chapter 9. When you receive a message from someone who uses digital signing, and you have that person’s public key, the message should contain a green bar along the bottom containing the words “Valid signa- ture.” If you see words to the effect that the signature is invalid, or if the signature is missing, then you should be suspicious and independently verify the authenticity of the e-mail message.
- 562. 526 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON Reading E-Mail Simply click an e-mail message to view it in the preview pane at the bottom of the screen. Alternatively, you can double-click a message to open it in its own program window (selecting a message and pressing Enter will have the same effect). As with most e-mail clients, any unread messages in the list appear in bold, and messages that have been read appear in ordinary type. By default, each message is marked as read after 1.5 seconds, but you can alter this value. To change it, click Edit ➤ Preferences, click the Mail Preferences icon in the Preferences dialog box, click the General tab, and then change the value under the Message Display heading. A value of 0 will cause the mail to switch to read status as soon as it’s clicked, which can be useful if you want to quickly clear a lot of messages. You can also mark many messages as read by highlighting them all, right-clicking an individual one, and selecting Mark As Read from the menu that appears. You can select multiple messages in the usual way: Shift-click to select a consecutive list, or Ctrl-click for nonconsecutive selections. Deleting Messages You can delete messages by highlighting them and pressing the Delete key. Alternatively, right-click any message (or a selection of them) and select Delete. The message will then be moved to the Trash folder. To empty the Trash folder, right-click the folder, and select Empty Trash, as shown in Figure 27-3. Figure 27-3. To permanently delete messages, right-click the Trash folder and select Empty Trash.
- 563. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 527 If you move any messages from folder to folder, as described later in the “Sorting and Filtering Messages” section, a copy of the mail will end up in the Trash folder. This is because Evolution doesn’t literally move messages. Instead, it copies them from the old to the new location and deletes the original. This can be a little disconcerting at first, but there’s nothing to worry about. The mail message will remain wherever you moved it, and it won’t disappear. Flagging Messages You can flag messages in a variety of ways to help remind you of their status or purpose. The simplest form of flagging is to mark a message as important: right-click the message and select Mark As Important, or click in the space beneath the Important column (this is located to the left of the From column). This will add an exclamation mark symbol along- side the message. Alternatively, you can add several different flags by right-clicking a message and selecting Mark for Follow Up. The choices, which can be selected from the Flag drop-down list in the dialog box that appears, range from Do Not Forward to No Response Necessary and Review. This heading will then appear in the message preview at the bottom of the window whenever the mail is selected. If you prefer a simple color-coding scheme, you can mark up a message by right-clicking it and selecting Label. Then assign a color. As you’ll see, each color relates to a key word or phrase. You can edit both the colors and the key phrases by clicking Edit ➤ Preferences, clicking Mail Preferences on the left of the dialog box, and clicking the Labels tab. IMPORTING OUTLOOK E-MAIL VIA THUNDERBIRD Back in Chapter 4, we discussed a method of exporting e-mail from various Microsoft e-mail programs, which use proprietary formats, so that it can be imported under Ubuntu. To recap, you can install the Mozilla Thunderbird e-mail client under Windows, import your e-mail into it from Outlook or Outlook Express, and then export Thunderbird’s mailbox (.mbox) files for importing within Evolution. If you followed these instructions and now have the .mbox files ready for use with Evolution, it’s easy to import them. Click File ➤ Import. In the Import dialog box, click the Forward button, and select Import a Single File. Click Forward again, and click the Filename drop-down list. This will open a file browsing dialog box, in which you can locate the .mbox file, and click Open. If you have more than one .mbox file, you’ll need to import each one manually. The Automatic entry in the dialog box refers to the file type and will select the correct file type by file extension.
- 564. 528 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON Composing a Message Creating a new e-mail is as simple as clicking the New button at the top left of Evolution’s program window. Fill in the To and Subject details as usual, and then type in the main body of the message. To add a CC or BCC, click the To button, and select addresses from your contacts list in the dialog box that appears (selecting the CC or BCC button as appropriate). Alternatively, if you would like to have the CC and BCC fields visible and available at all times, click their entries under the View menu of the Compose a Message window. As with most Microsoft mail programs, new e-mail can be sent either as plain text or as HTML. Plain text mode is the default. To switch to HTML, click the entry on the Format menu. The advantage of HTML mail is that you can vary the style, size, and coloring of text, so you can emphasize various words or paragraphs, as illustrated in Figure 27-4. In addition, if you click Insert ➤ Image, you can insert pictures from the hard disk. Other options on the Insert menu let you insert tables, dividing lines (click the Rule menu entry), and hyperlinks. Figure 27-4. New messages can be formatted in HTML, allowing you to change the color of text as well as its size.
- 565. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 529 The disadvantage of HTML e-mail is that the person receiving the message will need an HTML-compatible e-mail program to be able to read it. Your mail is also more likely to be tagged as spam by the recipient’s server, due to the widespread abuse of HTML and images in mail by spammers. ■Tip Many people in the Linux community frown on HTML-formatted e-mail and prefer plain text messages. Words are automatically spell-checked in the new e-mail, and are underlined in red if the spell checker thinks they are misspelled. To correct the word, right-click it, select a dictionary, and then select the correctly spelled word from the list provided. By default, if you chose the English language during the installation of Ubuntu, the Evolution spell checker will offer only an English (American) dictionary. You can switch to a British or Canadian dictionary by selecting Edit ➤ Preferences in the main Evolution window, clicking the Composer Preferences icon, and then clicking the Spell Checking tab. Select an alternative dictionary or multiple dictionaries by checking the boxes to the left of the dictionary names. While composing an e-mail, you can switch languages by selecting Edit ➤ Current Languages in the menu of the Compose Message window. If the language that you require is not listed, this means that you need to install an additional Aspell dictionary package with the Synaptic Package Manager. These dictionary packages usually have a two-letter suffix indicating the language that they support; for example, aspell-fr is the French dictionary package. Creating an E-Mail Signature E-mail signatures are the blocks of text that appear automatically at the end of new e-mail messages you compose. They save you the bother of typing your name and contact details each time. To create an e-mail signature, follow these steps: 1. Click Edit ➤ Preferences. Select Composer Preferences from the left side of the dialog box, and click the Signatures tab. 2. Click the Add button at the top right of the dialog box. 3. In the Edit Signature dialog box, type what you wish to appear as your signature. The signature can either be in plain text or HTML (click Format ➤ HTML). Don’t forget that in HTML mode, you can insert lines (Insert ➤ Rule), which can act as a natural divider at the top of your signature to separate it from the body of the e-mail, as shown in the example in Figure 27-5.
- 566. 530 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON Figure 27-5. Creating an e-mail signature saves you from having to type your contact details each time. 4. Click the Save and Close icon at the top left. 5. Click Mail Accounts in the Preferences dialog box, and double-click your mail account in the list on the right side. 6. In the dialog box that appears, click the Identity tab. In the Signature drop-down list, click the signature you just created. 7. Click OK and then Close in the Preferences dialog box. Your new signature will then automatically appear in new messages. ■Tip Enter a few carriage returns at the top of your signature so that when you create a new e-mail, you have enough space to click and type without accidentally clicking within the signature. Advanced E-Mail Tasks Evolution offers several features that can help you to organize your e-mail. You can create new folders, as well as filter, sort, and search through your messages.
- 567. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 531 Creating New Folders If you want to better organize your e-mail, you can create your own folders, which will then appear in the list on the left side of the program window. To create a new top-level folder, which will appear in the list alongside the standard folders (Inbox, Junk, Outbox, and so on), right-click On This Computer, and select New Folder. Then make sure that On This Computer is selected in the folder view of the dialog box that appears. Type a name and click Create. You can also create second-level folders, which will effectively be “inside” other folders and will appear indented below their parent folder within the list. For example, you might want to create a series of folders within the main Inbox folder to sort your mail from various individuals or organizations. To do this, right-click Inbox, select New Folder, and give the folder a name in the dialog box that appears, as shown in Figure 27-6. Once the new folder has been created, click the arrow next to Inbox to expand the display to show your new subfolder. Figure 27-6. You can create your own folders to better organize your mail. You can then drag-and-drop messages into the new folders, or simply right-click them, select Move to Folder, and select the folder from the dialog box that appears. This can be useful if you wish to select a handful of messages by holding down the Ctrl key. All you need to do then is right-click one of them and select Move to Folder. You can also copy messages from one location to another, thus producing two copies of the same message. Simply right-click the message, select Copy to Folder, and select the folder from the list. Alternatively, you can hold down the Ctrl key while you drag the message to the new location.
- 568. 532 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON Dealing with Junk E-Mail Evolution includes intelligent junk mail filtering. Any mail that Evolution thinks is spam or junk mail will end up in the Junk folder. When you first start using Evolution, you should check the folder regularly, because there’s a chance Evolution might have made a mistake. However, this is a good thing, because by right-clicking the message and selecting Mark As Not Junk, the Evolution junk mail filter will be able to better understand what to consider as junk in your particular Inbox. In a similar way, if you find that Evolution misses a junk e-mail, and it ends up in your Inbox, you can right-click it and select Mark As Junk. Alternatively, select it and click the Junk icon on the main toolbar. To empty the Junk folder, select all the messages (Ctrl+A), right-click, and select Delete. Bear in mind that, as with any folder, once the messages are deleted, they will appear in the Trash, and you can restore them from there if necessary. Sorting and Filtering Messages You can filter incoming messages according to practically any criteria, including who sent the message, its subject line, words within the body of the mail, its size, or even if it has attachments. Coupled with the ability to create folders, this allows you to automatically sort messages as soon as they’re received. To set up filters, click Edit ➤ Message Filters. Click the Add button and, in the Rule Name box, start by giving the new rule a descriptive name by which you’ll be able to recognize it in the future. You might think this isn’t important, but you may create tens, if not hundreds of filters, so being able to identify filters will be very helpful. As shown in Figure 27-7, the Add Rule dialog box is split into two halves: “Find items that meet the following criteria” and “Then.” As implied by the labels, if the selected conditions are met, then the selected actions will take place. The “Find items” part is used to identify the mail. You can select to filter based on almost any criteria, such as who appears in the Sender field of the message, words that appear in the Subject line, the date sent, and so on. Simply select what you require from the drop-down list directly beneath the Add Filter Criteria button. In most cases, you’ll then need to specify details for the filter. For example, if you select to filter by the address of the individual sending the e-mail, you’ll need to provide that e-mail address. ■Tip Several If rules can be created. For example, you could create a rule to filter by the address of the sender, and then click the Add Filter Criteria button to create another rule to filter by text in the Subject line. By clicking If All Criteria Are Met in the Find Items drop-down list, the mail will be filtered only if both conditions are met. By selecting If Any Criteria Are Met from the drop-down list, the mail will be filtered if either condition is met.
- 569. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 533 Figure 27-7. Creating message filters lets you automatically organize your e-mail as soon as it’s received. Once you’ve set the Find conditions, you need to select from the Then section of the dialog box. This tells Evolution what to do with the filtered mail. The obvious course of action is to move the e-mail to a particular folder, which is the default choice, but you can also delete the e-mail, set a particular flag, beep, or even run a particular program! As with the rules for finding items, you can set more than one condition here, so you can have Evolution beep and then delete the message, for example. Creating Search Folders Evolution’s search folder feature is a more powerful alternative to message filters. Using search folders, you can filter mail based on a similar set of criteria, but you can choose to include messages in the results that might be associated with the filtered messages. For example, if you choose to filter by a specific individual’s e-mail address, you can select to have any replies you sent to that person included in the results, rather than simply messages received from her. In addition, you can apply search folders to specific e-mail folders on an ongoing basis, rather than all incoming e-mail. It’s important to note, however, that a search folder isn’t a filter. The messages aren’t moved into the new folders. They stay where they are in your Inbox (or any other folder they might be contained in). Despite the name, search folders are actually little more than saved searches. They just act like filters. However, search folders are dynamically updated—if a message is deleted from the Inbox folder, for example, it will also stop appearing in any relevant search folder.
- 570. 534 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON You can create a new search folder by clicking Edit ➤ Search Folders and then clicking the Add button. You can choose to search specific folders (the default), all local folders, or all active remote folders (which includes any of your mail stored on a server elsewhere). As with creating message filters, clicking the drop-down box beneath the Add button will let you select filtering criteria. The choices are broadly similar to those for message filters, in that you can filter by e-mail address, size of e-mail, message body, and so on. In the Include Threads drop-down box, you can select what kind of results you would like the search filter to return: • None simply returns e-mail messages matching the criteria. • All Related returns every single message that is associated with the criteria. • Replies returns results that include replies to the messages returned via the filter. • Replies and Parents returns results that include replies and also any initial message that you or others might have sent that inspired the message included in the filter results. • No Reply or Parent returns results that include only initial messages sent to you. Search folder results are listed under Search Folders on the left side of the Mail mode window. The Unmatched folder, present by default, simply shows any messages that aren’t included in any of the search folders. The search folder feature is very powerful and worth spending some time investigating. TIPS FOR USING EVOLUTION E-MAIL In many ways, Evolution is similar to e-mail programs you might have used in the past, but it also has a few of its own quirks and idiosyncratic ways of working. Here are a handful of preferences you might want to set to have Evolution behave in a more familiar way: • Forward e-mail inline: If you attempt to forward a message, Evolution will attach it to a new message as a file. The person receiving the e-mail will then need to double-click the file to view the forwarded e-mail, which can be confusing. The solution is to make Evolution forward the message in-line, which is to say that Evolution will quote it beneath the new mail message, like Microsoft e-mail programs. To do this, click Edit ➤ Preferences, click Composer Preferences on the left side of the dialog box, click the Forward Style drop-down list, and select Inline. • Change the plain text font: Any messages sent to you in plain text format, rather than HTML, will appear in the message preview pane in a Courier-style font. To have messages display in a more attractive and readable typeface, click Edit ➤ Preferences, select Mail Preferences on the left side of the dialog box, and then remove the check from Use the Same Fonts As Other Applications. In the Fixed Width Font drop-down list, select an alternative font. The standard Ubuntu font is called Sans and is a good choice.
- 571. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 535 • Always create HTML e-mail: Evolution defaults to plain text e-mail for any new messages you create. If you want to always create HTML messages, click Edit ➤ Preferences, click Composer Preferences on the left side of the dialog box, and then put a check alongside Format Messages in HTML. • Empty Trash on exit: To automatically get rid of deleted messages each time you quit Evolution, click Edit ➤ Preferences, click Mail Preferences on the left side of the dialog box, and put a check alongside Empty Trash Folders on Exit. Then select how often you would like this to happen from the drop-down list: every time you quit Evolution, once per day, once per week, or once per month. • Vertical message window: As an alternative to positioning the message preview window beneath your messages, Outlook lets you position the message at the right of the message list, thus forming three vertical columns (folders, messages, and preview). To switch to this view under Evolution, click View ➤ Preview ➤ Vertical View. Contacts Evolution includes a powerful contacts manager component that can catalog information about individuals. At its most basic, the contact manager stores e-mail addresses for use within the e-mail component of Evolution, but you can enter significant additional data about each individual, including addresses, phone numbers, fax numbers, and even a photograph for easy identification. This should allow Evolution to become your sole personal information manager. To switch to the Contacts mode, click the button at the bottom-left side of the program window. Once in the Contacts mode, you can view information in several ways. Click View ➤ Current View to choose from the following views: Address Cards: This is the default view and shows the contacts as virtual index cards arranged alongside each other at the top of the program window. Click the scroll bar beneath the cards to move through them. List View: This shows the contact information as a simple list, arranged vertically, with various elements of the contact’s personal information listed alongside, such as phone numbers and e-mail addresses. By Company: This organizes the data in a similar way to List view but sorted by the company the contacts work for (if such data has been entered into the contact entries). Adding or Editing Contact Information By far, the best way of initially building up your contacts list is to right-click e-mail addresses at the head of messages, in Mail mode, and select Add to Addressbook. This will add a simple contact record consisting of the individual’s name and e-mail address.
- 572. 536 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON When using Microsoft mail applications, simply replying to an e-mail from an individual is enough to add that contact to your address book. Evolution is capable of this behavior, too, but the feature isn’t activated by default. To set this up, click Edit ➤ Preferences, click Mail Preferences on the left side of the dialog box, and click the Automatic Contacts tab. Next, put a check in the box marked Automatically Create Entries in the Addressbook When Responding to Messages. From the Select Address Book for Automatic Contacts drop-down list, select Personal. In the same dialog box, you can import contacts from the Pidgin instant messaging client. You can then edit the contact details by double-clicking the entry in Contacts mode. This will let you enter a variety of information, as shown in Figure 27-8. To import a photo for this contact, click the top-left icon. You can use any picture here, and you don’t need to worry about its size, because it will be resized automatically by Evolution (although its aspect ratio will be preserved). The imported photo will appear in the lower area of the Contacts window when you click the contact’s name. Figure 27-8. A lot of information can be entered for each contact, and, by clicking the button at the top left, you can also add a photograph.
- 573. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 537 Creating a Contact List Contact lists are simply lists of e-mail addresses. Once a list is created, you can right- click its entry in the contacts list, and then choose to send a message to the list or forward it to someone else as a vCard. The obvious use of contact lists is for sending group e-mail messages. ■Note vCard is a virtual business card. Effectively, it’s a small file that contains personal information. As well as personal data, vCards can contain pictures and audio clips. They’re understood by practically all business- level e-mail programs, including Microsoft Outlook and Apple Mail. To create a contact list, click the small down arrow next to the New button in Contacts mode, and select the option from the list. Give the list a name in the relevant box, and simply click and drag contacts from the main program pane onto the bottom of the Contact List Editor pane. This will automatically add their names and e-mail addresses. Alterna- tively, you can type their e-mail addresses manually into the field under the Members heading, and then click the Add button, which can be useful if the individual isn’t in your contact list. By checking the Hide Addresses When Sending Mail to This List option, you can ensure that the e-mail addresses are added to the BCC field of a new message, so people on the list don’t see the others on the list. Calendars The Calendars mode of Evolution allows you to keep an appointments diary. Entries can be added in half-hour increments to the working day, and you can easily add events to days that are weeks, months, or even years in advance. Viewing a day’s appointments is as simple as clicking its entry in the monthly view at the top right of the program window. Specifying Appointment Types You can make the following three types of diary entries: Appointments: These are events in your diary that apply to you only. You might have a meeting with a colleague, for example, or might simply want to add a note to your diary to remind you of a particular fact.
- 574. 538 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON All Day Events: A training day or a holiday could be entered as an all day event. However, all day events don’t block your diary, and you can still add individual appointments (after all, just because your day is taken up with an event, that doesn’t mean you won’t need to make individual appointments during the event). All day events appear as a light-blue bar at the top of the day’s entry in your diary. Meetings: Meetings are like appointments, but you also have the option of inviting others to attend. The invitations are sent as iCal attachments to e-mail, so users of Microsoft Outlook should be able to reply to them (provided Outlook is properly config- ured; see the program’s documentation for details, and note that iCal is sometimes referred to by the specification number RFC 2446/2447). Once an individual receives a meeting invitation, he can click to accept or decline. When Evolution receives this response, the individual’s acceptance or declination will be automatically added to the diary entry. Adding or Editing a Diary Entry These instructions assume the Calendars mode is set to Day view, which shows a full working day diary alongside a monthly calendar. To ensure Day view is selected, click the Day icon on the main toolbar running across the top of the screen. Day view is the default calendar view under Evolution. The other choices are Week, Month, and Work Week (which shows appointments during the week in daily columns). If you switch to another view, Evolution will always work in that view until you change back again. To add a new diary entry, simply select the day in the monthly calendar on the left, and then select the time the appointment is to start in the day viewer. Then right-click and choose an appointment, an all day event, or a meeting. To edit an existing diary entry, double-click its entry in the list. ■Note When you right-click in Calendars mode, you’ll also see an option to add a task. Adding a task in Calendars mode automatically links it to the selected day and time. Task items due on the current day are marked in dark blue. At its most basic, all an appointment needs in order to be entered into your diary is some text in the Summary field, as shown in Figure 27-9. By default, appointments and meetings are assumed to last for half an hour, but you can change this by clicking the down arrow in the Minutes or Hours fields. For what it’s worth, appointments can go on for days—just select a sufficient quantity of hours. You can actually set the meeting dura- tion to 10,000 hours (wouldn’t that be the meeting from hell?)!
- 575. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 539 Figure 27-9. When creating a new appointment, you can add all the details you need, but don’t forget to set how long it lasts! By clicking the Recurrence button, you can set the appointment to be booked into your diary according to certain intervals. Start by putting a check in the This Appointment Recurs box, and then select a time interval. For example, selecting 1 week will mean that the appointment is booked into your diary automatically on a weekly basis. After this, select a day of the week for the recurring appointment. Following this, you must specify the number of recurrences. You can specify an ending date for the appointment or select Forever. In the calendar view at the bottom of the dialog box, you’ll be able to see how this looks. Days in bold are those that have appointments. It’s also possible to set exceptions, as when the meeting might skip a week. This could be useful to work around holidays, for example. Simply click the Add button, and then type a date or click the down arrow to select the date from a calendar. Once you’re finished, click the Close button to add the details of the recurring event to the appointment. In the case of meeting appointments, you can click the Add button to invite others to the meeting via iCal invitations, which will be sent out by e-mail as soon as you’ve finished creating the appointment. Simply click the Add button, and in the empty field that appears, start typing the contact name of the individual you want to invite. If the person is already in your contacts list, the name will be automatically completed, but you can also type individual e-mail addresses. By selecting the entry and clicking Edit, you can alter the role of the individual. The choices are Chair, Required Participant, Optional Participant, Non- Participant (that is, somebody you want to inform about the meeting but who doesn’t need to attend), and Unknown (for all other instances).
- 576. 540 CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON Clicking the Free/Busy button will open a new dialog box showing who can and can’t attend, according to replies to the invitations sent out (obviously, this is a feature you’ll be using after you initially created the appointment). On the left side of the dialog box, you will see the list of attendees and also their status: whether they’ve accepted, declined, or sent a busy/tentative reply (in which case, you might choose to reschedule the meeting). Memos and Tasks The Memos and Tasks modes are the simplest components within Evolution. Memos mode allows you to jot down simple notes, and Tasks mode allows you to create a to do list. In both modes, which can be selected by clicking their buttons at the bottom left of the screen, the program window consists simply of an area where you can click to add a new memo/task, a list area, and a preview area, which will show any details of the currently selected task. In the case of Tasks mode, after you’ve made an entry, clicking the check box alongside it will mark it as completed. Completed items appear with strikethrough, as shown in Figure 27-10. Figure 27-10. The Tasks mode lets you catalog chores that you want to do during the day.
- 577. CH AP T ER 27 ■ I N D EP TH : E VO LU TI ON 541 To add a new memo or task, click the bar that reads Click to Add a Memo (or Task), type a description, and then press Enter. You will be able to enter more tasks or memos in the same field. Double-clicking a task or memo allows you to fine-tune its details. For example, you can add a due date for a task, so you’ll know when the task must be completed. You can also add a description for future reference and attach files by clicking the relevant button on the toolbar. By clicking the Status Details button in the Task Details dialog box, you can also set a percentage figure for completion of the task, as well as its priority, ranging from Low to High. Summary This chapter has been a whistle-stop tour of Evolution’s main features. We’ve looked at e-mail creation and organization, contacts management, working with the appointments calendar, and editing the task list. Evolution is a powerful program. Be sure to take a look at its help documentation (Help ➤ Contents) to learn more about it. In the next part of the book, we look at keeping your system running. As a first step, the next chapter explains how to install, remove, and otherwise manage the software installed under Ubuntu.
- 579. PART 7 ■■■ Keeping Your System Running
- 581. CHAPTER 28 ■■■ Installing and Removing Software O ne of the fun things about running any operating system is the ability to expand it—to add in new software over time to improve your workflow or just for entertainment value. Linux is blessed in this regard, because tens of thousands of software titles are available to meet just about every need. However, even if you’ve tracked down the ideal software title, there’s just one barrier to overcome: actually installing it on your system. Installing software under Ubuntu isn’t the same as with Windows. Users are afforded a lot more power over what happens to their systems, but this comes at the expense of needing to take a little time to understand the terminology and techniques. That is what you’ll learn in this chapter. Software Installation Basics Installing programs on Windows is relatively easy. If you wish to use the WinZip archive tool, for example, you can browse to the web site, download the installer .exe file, and install the software. Although you might not realize it, a lot of work goes into making this seemingly simple task possible. Once the original software has been created by the programmers, it must be made into a form that you, the end user, can deal with. The first thing to happen is that the software is compiled. This is the process of turning the source code created by programmers into an actual file (or set of files) that can be used on a daily basis. On most systems, compiling source code involves a lot of number crunching. This takes time—hours, in some cases—and this is why it isn’t normal practice to compile the source code every time you want to run the program. Once the program files have been compiled, there needs to be a way they can be installed on various systems and easily transported across the Internet. This is where packaging comes into the equation. Programs usually consist of many files. To make each program file individually available would mean that some are sure to get lost or corrupted, and the program wouldn’t work. Therefore, the files are usually combined into a single archive file. In addition, third-party system files are added to ensure compatibility on all computers 545
- 582. 546 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE and an extra program, called an installer, is added so that users can quickly get the files onto their systems. All of this means that, to be able to install a program like WinZip on Windows, all you need to do is download the installer .exe file and run it once. No more work is necessary. Linux is a little more involved, largely because it never assumes that users want their environment to be simplistic and with limited options. However, most Linux distributions still embrace the paradigm of packaging software into a single, easily transported file. We will explain how software packages work in Ubuntu in a moment, but first it’s necessary to understand other typical software distribution file formats used in the world of Linux. Formats of Linux Installation Files If you visit the web site of a particular Linux application, you may find that it’s available to download in a number of different formats. The program will almost certainly be available as source code—the original human-readable text that the developer created. But it might also be available as a binary or a package file. ■Tip Linux isn’t the only operating system for which open-source programs are created and used. There are open-source projects for both Windows and Apple Macintosh, many of which are hosted at the http:// sourceforge.net web site. Many other, less widely used operating systems also rely on open-source soft- ware to a greater or lesser extent. Here are the formats by which Linux software is normally distributed: Source code: Programmers write their software in various programming languages, such as C and C++, and the code that results is known as source code. To make source code usable, it must be compiled into a binary. Because the cornerstone of the Linux philosophy is the sharing of source code, you’ll almost always find the source code of a program available at the developer’s web site. You can then download and compile this on your own system (or, if you’re so inclined, study the source code to further your understanding). Although compiling source code isn’t very hard to do, it’s more convenient to download either a binary version of the program or a package. Binary files: You might find ready-made binary files are available at the developer’s web site. In other words, the programmer has taken his or her own source code and, as a service to users of the program, compiled it so that it’s ready for use as soon as it’s downloaded. For example, this is how Linux versions of the Mozilla Foundation software, like Thunderbird and Firefox, are currently distributed if you download them directly from www.mozilla.com. Sometimes binary files come with scripts to help you install them. However, in most cases, you simply place the files in a convenient location on your hard disk, and then run them from there.
- 583. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 547 ■Note In the cases of both source code and binary files, the files usually come in a tarball, which is a single archive file containing other files. A tarball isn’t, by definition, compressed, but usually either the bzip2 or gzip tools are used to shrink the file, to ease transportation across the Internet. Self-installing binaries: Some larger programs are made available as self-installing binary files. This comes very close to the way Windows works, because when the file is executed, a GUI-based installation wizard takes you through installation. If you download OpenOffice.org from the official web site (www.openoffice.org), for example, you’ll end up with a single 80MB+ file, which you then simply execute from the command line. Package files: In many cases, you’ll find that a package file of the program is available. In this case, someone has compiled the software files and put them all together in a single, easily transportable file. Ubuntu package files end with .deb file extensions, but other Linux distributions use other package formats, such as .rpm (Fedora/Red Hat, SUSE Linux, and Mandriva, among others). ■Note As a blanket rule, an installation package created for one distribution won’t be compatible with another. It’s possible to use a program called alien under Ubuntu, which aims to convert packages between distributions and different package formats, but this should be seen as a last resort. You’ll be better off simply obtaining a package specifically designed for your Linux distribution. Package Management Of all the preceding formats, packages are by far the most common and popular in the world of Linux. Ubuntu utilizes packages, as do nearly all other distributions. In fact, the Ubuntu DVD-ROM contains hundreds of packages. A well-implemented package management system is able to install programs, upgrade them, and uninstall them, all with just a few keystrokes or clicks of the mouse. It vastly reduces the amount of work required to get new software onto your system and makes maintenance tasks such as upgrading software easy, too. It’s important to understand what an Ubuntu package file actually is and what it contains. With Windows, an installation .exe file is effectively a piece of software combined with an archive of files. When you run the executable, it triggers a small program contained within it that then unpacks the contents of the file and installs them to the hard disk. In contrast, package files used by Ubuntu merely contain the program files along with a handful of configuration files to ensure the software is set up correctly. Package files are useless without the various pieces of software already installed on the system that are used
- 584. 548 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE to manipulate them and do the hard work of installing, removing, and querying them. This software is known as the package management system. In the case of Ubuntu, the package management system has two components: dpkg and APT. The use of a package management system has a number of benefits. The package manage- ment system builds its own database, so it knows exactly what programs are installed at any one time. Therefore, you can simply query the database rather than search the applications menu or hard disk. The package system also keeps track of version numbers. This gives the user much more control over the software on the system, and it makes updating easy. The use of a package management system also means that if a program starts to act strangely, its configuration files can simply be refreshed using the package manager. There’s no need to uninstall and reinstall the software, as is so often the case with Windows programs. Dependency Management One of the key features offered by any package management system is dependency manage- ment. Put simply, the package manager ensures that if you install a piece of software, any additional software it relies on to work properly is already present on the system. It the software isn’t present, the package manager must either resolve the situation automatically or ask you what to do. Sometimes, the software you want to install might depend on other programs on your system, but more often, the dependencies take the form of system libraries. It helps if you realize that not all packages contain software that you, as a user, will make direct use of. Some packages contain nothing but library files—shared pieces of code that are equivalent to .dll files under Windows. The key library on an Ubuntu system is the GNU C Library, without which the Linux kernel couldn’t function, which is provided by the libc6 package. But practically every program has its own needs when it comes to library files, and these requirements must be handled by the package manager. ■Note One reason Windows installation files are often so large is that they typically come with all the system files they need, in case they’re not already present on the system. This does not make dependency problems disappear, however. Third-party applications installers sometimes overwrite existing libraries with versions that are incompatible with the rest of the system. Dependency management doesn’t just mean adding in packages that a piece of soft- ware needs. It might also mean removing packages already present on your system. This might need to happen if they’re incompatible with new software you want to install, something that’s referred to as package conflict. In addition, sometimes you might want to remove a package that other packages rely upon, a situation known as reverse dependency. In such a case, the package manager must either stop you from removing that software,
- 585. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 549 to avoid breaking the software that depends on it, or remove the reverse-dependency packages, too. In most cases, it will ask you what you wish to do. DEPENDENCY HELL If you try to install certain software packages, you will very likely find that they depend on other packages, such as software libraries. These must be either already present on the system or installed at the same time for the software to work correctly. Ubuntu will attempt to take care of the latter automatically. In a similar way, removing software also means that other packages that rely on that particular software must also be removed, a situation known as reverse dependency. Dependency hell comes about when chains of dependencies arise, which is to say, when a program you install or remove involves the installation or removal of several other, apparently unrelated pieces of software. For example, let’s say you decide to manually install a program called Oscar. You download it and type the command to install it, but you are then told that this depends on another program called BigBird, which isn’t installed. Fine, you think, I’ll just download and add BigBird to the same instal- lation command. But it then transpires that BigBird has its own dependency of Snuffleupagus. You download and add that, too. Alas! Snuffleupagus has its own dependency of MrHooper. This can carry on for some time, and this is why it’s not advised to manually install or remove soft- ware without using something like Synaptic Package Manager. In the preceding example, Synaptic would add in all the dependencies automatically and download and install them at the same time. Dependency chains like this are a by-product of any package management system. The solution is often simple—just don’t remove the software package. After all, hard disks are extremely large nowadays, and space is rarely an issue, so there’s little reason to not have software packages you no longer need hanging around. Software Repositories As mentioned previously, dpkg and APT take care of package management within Ubuntu. These tools are taken from Debian, on which Ubuntu is based. Debian Package, or dpkg, is the most basic part of the system. It’s used to install and uninstall software, and it can also be used to query any individual software packages. It’s like the manager in a warehouse who is tasked with knowing exactly what boxes have been stored where. The manager doesn’t know where the boxes come from, and he doesn’t know anything about packages outside his warehouse. He just manages the boxes that are delivered to him and that are stored in his warehouse. dpkg is aware of dependency issues and will refuse to fully install a package if the others it needs aren’t already installed or supplied at the same time. But it doesn’t have the means to fix the situation automatically. This is akin to the warehouse manager’s inability to order more boxes if he needs them. That’s not his job. He’ll just tell you if boxes delivered to him are missing some of their components.
- 586. 550 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE Because of this, there’s an additional layer of software that sits on top of dpkg called the Advanced Package Tool, or APT. APT is very sophisticated. Its job is to handle dependency management. Try to install some software using APT, and any dependency issues will be worked out for you. APT can do this because it’s designed to work with software repositories. Users can search and install packages from these collections of software. More often than not, these software repositories are online, but that’s not always the case. The DVD supplied with this book contains the base installation software repository, for example. ■Note As you might already have guessed, the Synaptic Package Manager is simply a GUI front-end for the APT system. You can see this clearly when you’re installing or removing a package. In the Apply Changes dialog box that appears after software has downloaded, click Terminal, and you’ll see the output of various APT commands. It’s important to note that APT relies on the dpkg system to take care of the actual instal- lation. Effectively, dpkg and APT are two sides of the same coin. As you might have realized, the package management system means that Linux software installation/removal is a fundamentally different proposition than handling software under Windows or Mac OS. If you want to install new software, the first place to look is the Ubuntu software repositories. The online repositories contain most of the popular soft- ware available for Linux right now, all packaged for installation under Ubuntu. It’s comparatively rare for an Ubuntu user to visit a web site and download a package file for installation, as is often the case for Windows users, and the only time this normally happens is if you can’t find what you’re looking for in the official repositories. ■Tip Software repositories don’t have to be “official,” or sanctioned by Ubuntu, to be used under Ubuntu. Sometimes, you might opt to add repositories that contain particular software, such as multimedia repositories. This may be necessary because multimedia formats are often licensed under terms that Ubuntu doesn’t agree with, so it declines to offer this software from its official repositories. Out of the box, Ubuntu comes with a couple of software repositories already config- ured. These allow you to download new software and also update the system online. Ubuntu software repositories are subdivided into various categories and components.
- 587. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 551 SOFTWARE VERSIONS Because most Linux software is open source, a curious thing happens when it comes to software versions. Rather than there being just one “official” version of a program, such as with most Windows software (where you must download the official version of the file), many individuals and organizations take the source code, compile it, and make their own package files available for others to use. For example, virtually all the software installed with Ubuntu has been compiled by Ubuntu devel- opers. This means it can be quite different from what’s “officially” available at the programmer’s web site. In some cases, the source code is tweaked to fix notorious bugs or apply a different look and feel to the software, so it integrates with the distribution. Often, the configuration files are changed so that the software works properly under Ubuntu, such as integrating with other software packages. The programmer behind the software doesn’t mind when such things happen, because this way of working is part and parcel of open-source software. In fact, the programmer is likely to encourage such tweaking. Because of this, the first place to look if you want any additional software is not the developer’s web site but the Ubuntu software repositories. If the package is available in the Ubuntu main distribution, you’ll get an officially sanctioned Ubuntu release that will fit in with the rest of your system and won’t require much, if any, additional work to get it up and running. Categories of Repositories Regardless of whether they’re online or on a CD/DVD, Ubuntu repositories are strictly categorized according to the type of software they contain: Main Distribution: This repository contains the packages that are required to install Ubuntu. This repository usually takes its name from the code name for the release, and is activated by default. For Ubuntu 8.04, the main distribution repository is called hardy, after the code name for the 8.04 release (Hardy Heron). In the previous release, the main distribution repository was called gutsy. (For more details on Ubuntu code names, see https://wiki.ubuntu.com/DevelopmentCodeNames.) Security Updates: Sometimes, security flaws are so serious that they need to be fixed immediately, within as little as 24 hours of being discovered. If so, the pack- ages concerned will be placed on this server. The Security Updates server isn’t about new versions or functionality. It’s about fixing security holes rapidly. This repository is also activated by default. Recommended Updates: This repository contains newer versions of the packages in the main distribution repository. Like Security Updates, this category also offers bug fixes, but these fixes aren’t urgent and are often more substantial than quick patches to fix a critical bug.
- 588. 552 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE Proposed Updates: This is a special category by which testing releases of updates are made available. There’s no reason to use this category unless you want to test packages and help fix bugs (for more information, see https://wiki.ubuntu.com/ HelpingWithBugs). This category is not activated by default. Backported Updates: The Backports server allows access to software that’s intended to go into the next version of Ubuntu but has been packaged for the current version. This software might not have been tested thoroughly and so is suitable only for neophil- iacs or those who absolutely need the latest version (perhaps because of a vital new feature it offers). This category is not activated by default. Repository Components In addition to the categories listed in the previous section, the Ubuntu repositories are further split into components (effectively subsections) according to how essential the soft- ware is to a basic Ubuntu installation or the license that the software uses. Here are the components under which software is filed within a repository: Main: This section contains nearly all the software that’s featured in a basic Ubuntu installation. As such, it’s all Free Software, and every package is supported by Canonical, the company that oversees the Ubuntu project. That means that updates are frequently provided to fix security holes or simply to keep up with latest releases. ■Note Free Software refers to software that’s licensed under the GNU Public License (GPL). It doesn’t mean that the software is free of charge, although that’s nearly always the case. Restricted: Although Ubuntu is mostly Free Software, it must include some drivers released only in binary form (that is, closed source) and that, therefore, have license agreements that are not compatible with the goals of Free Software. That’s what you’ll find in this section. Some hardware simply won’t work fully without software from the Restricted section. Universe: This section might be referred to as “the rest,” because it contains the majority of Free Software available at the present time. Much of it is borrowed from the massive Debian software repository, although the packages are sometimes tweaked to work correctly under Ubuntu before being made available (some people who create Debian packages also create the Ubuntu equivalents). Unlike Main and Restricted, the Universe section is not officially supported by the Ubuntu project, which means there’s no guarantee that security flaws will be fixed. Nor is there any guarantee of updates, although most packages are usually updated regularly.
- 589. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 553 Multiverse: As with the Restricted section, here you’ll find software that’s released under a software license incompatible with either the letter or spirit of Free Software. However, unlike the software in the Restricted section, none of the software in Multiverse is considered essential to a default Ubuntu installation. Source Code: This section contains source code packages. Unless you’re a software developer, or are thinking of becoming one, this section won’t be of much interest. Now that we’ve covered the basics of Linux software installation, it’s time to talk about the tools used to manage software. First, we’ll look at graphical applications that can be used to manage software, and then we’ll look at the command-line tools you can use. The Synaptic Package Manager in Depth The Synaptic Package Manager is effectively a graphical front end for the APT system. You can use it to search for and install software. To start this program, click System ➤ Administration ➤ Synaptic Package Manager. Searching for Software Before searching for software, it’s always a good idea to refresh the package database. This database describes the software contained in the repositories, and it is held on your hard disk. Just click the Reload button on the Synaptic Package Manager toolbar to grab the latest package lists from the various repositories you’re subscribed to (that are in your sources.list file). Reloading can take a few minutes on a slow connection, but it ensures that you have access to the latest software within the repositories. You can search for software in two ways: Quick: For a quick search, click any entry in the list of packages, and then simply start typing. This will match what you type against the package names and sort the list dynamically, as you type. In-depth: For an in-depth search, click the Search button on the toolbar. By default, this searches through both package names and the descriptions, for a higher chance of a match. You can type either the specific program name or a keyword that may be within the description. For example, if you are looking for graphics drivers for your nVidia card, but you don’t know the name of the package that contains them, you can type nvidia.
- 590. 554 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE ■Tip You don’t need to type whole words in the search field. You can type part of a word or, more commonly, the word in a shortened or alternate form. For example, if you’re looking for an e-mail client, it might be more fruitful to simply type mail client or even just mail. This will then return results containing e-mail, mail, mailing, and so on. By clicking the Settings ➤ Filters button, you can enhance your search results by filtering out any packages that don’t meet your requirements. You can filter by criteria such as whether the software is already installed, whether it’s new in the repository, and much more. It’s advisable to click the New button to create your own filter before starting, as shown in Figure 28-1, rather than editing one that’s already there. Once a filter has been created, you can apply a filter to search results by clicking the Custom Filters button at the bottom left of the main program window, and then clicking the name of your filter in the list. Figure 28-1. Filters can be used to trim the list of search results according to certain criteria. One use of filtering is to remove the check alongside Installed so that you can remove from the search list any packages that might be already on your system.
- 591. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 555 ■Note Filtering can help reduce the number of search results if you use a generic search term, but don’t forget to deactivate it when you’re finished. To do so, click All at the top of the filters list. In the search results, any packages with the Ubuntu symbol next to them are supported packages, which is to say, they’re from the Main or Restricted software repositories, as opposed to Universe, Multiverse, or a third-party repository. Therefore, future updates are likely to be offered. If the check box is green, that means the package is already installed. A star next to the check box means the package is new. You can view the complete range of Synaptic icons by clicking Help ➤ Icon Legend. Installing Software When you click the check box next to a piece of software in the search results and select Mark for Installation, the program will be queued for installation, which will take place as soon as you click the Apply button on the toolbar. If the program has any uninstalled dependencies, you’ll also see a dialog box asking you to confirm installing those as well. If you agree, these will be automatically added to the list of packages to be installed. Additionally, if you right-click the file and select Mark Suggested for Installation or Mark Recommended for Installation, you’ll see a list of programs that, although not essential to the running of the program in question, will enhance its features to some degree. For example, if you choose to install the VLC media player program, it’s also suggested that you install mozilla-plugin-vlc, so that VLC can be used as plug-in for playing media files in Firefox. You don’t have to install these recommended programs; the software will run fine without them. But it can often be rewarding if you do so. ■Note If the software in the recommended and suggested lists is grayed out, that means it’s already installed. It’s also possible that the package doesn’t have any recommended/suggested packages. Once you click the Apply button on the toolbar (bear in mind that you can install more than one piece of software at once), you’ll see the Summary dialog box, as shown in Figure 28-2. Here, you’re once again asked to confirm what needs to be installed. If any software needs to be removed in order to handle dependency issues, you’ll be told about this, too. Additionally, under the Summary heading, you’ll be shown the total size of the files that will be downloaded, as well as the space required on your hard disk.
- 592. 556 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE Figure 28-2. Before any software is installed by the Synaptic Package Manager, you’ll be told what it is and asked to confirm the choice. At the very bottom of the Summary dialog box, you’ll see a check box marked Down- load Package Files Only. As it suggests, this will download but not install the packages. If you then select the package for installation again in the future, you won’t need to down- load it, and installation will be almost instantaneous (unless a newer version of the package has been released; in which case, the newer version will be downloaded and installed). If you see an Unchanged heading in the Summary dialog box, this means that there are several system updates available that you haven’t selected for installation. To install the system updates, click Cancel, and then click Edit ➤ Mark All Upgrades. Then click Apply again. You will then see two separate headings in the Summary dialog box: one listing the upgrades and one listing the new packages you’ve selected to install. ■Note Of course, you can opt to ignore the fact that updates are available and simply go ahead with instal- lation. Installing updates as soon as possible is advised but not enforced.
- 593. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 557 METAPACKAGES Software such as the GNOME desktop actually consists of a number of programs and system libraries, rather than one single piece of software. Therefore, you might be wondering how, as just one example, you might install the KDE desktop under Ubuntu 8.04. Is it necessary to install each component’s package manually? In theory, dependency management should be able to help, and you should be able to select one key part of the KDE desktop system, such as the Konqueror file browser, and have the Synaptic Package Manager take care of the rest. After all, Konqueror will be dependent on other KDE packages. Alas, this rarely works in reality. Installing Konqueror in this way will indeed install much of the KDE desktop suite, but not everything. Konqueror isn’t reliant on Kate, for example, which is the default text editor under KDE. And although the packages will be installed, there’s no guarantee that they’ll be configured to work correctly as a desktop environment. Metapackages provide the solution. These are packages that contain configuration files to ensure the full range of software is installed and configured correctly, and they also have extensive lists of dependencies that include the complete set of packages for the software in question. (The metapackage for KDE is kdebase, but if you want the full Kubuntu experience, you should install the kubuntu-desktop metapackage.) Alongside desktop suites, other examples of Ubuntu metapackages include the OpenOffice.org office suite, where the metapackage ensures all the components of the suite can be easily installed, and the X.org graphical subsystem. To see what metapackages are available, simply search for metapackage using the Synaptic Package Manager. Removing Software To remove a piece of software, search for it by name, click the check box alongside it, and then select Mark for Removal. This will remove the software but leave behind any config- uration files it created. This means you can install it again in the future, and it will function as it did before removal. However, you can also select Mark for Complete Removal, which will remove the configuration files. As with installing software, the Synaptic Package Manager will attempt to manage dependencies when you remove software, but in this case, it will enforce the removal of any software that explicitly relies on that software. Often, the solution is simply not to remove the software package. After all, modern hard disks have huge capacities, and it’s unlikely the package will take up much room.
- 594. 558 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE USING ADD/REMOVE APPLICATIONS You can use another graphical package manager, accessed by selecting Applications ➤ Add/Remove Applications from the Ubuntu desktop, to easily install or uninstall programs without worrying about package dependencies. The Add/Remove Applications window shows a list of application items. Each item has a check box that denotes whether the listed application is installed, with a brief description and a popularity rating. By selecting an item, you can view more information about the application at the bottom of the window. Selecting an item to install or uninstall is as easy as marking or unmarking the item’s check box. To find the software you are looking for, you can filter the items in the list by selecting a software category in the left column. The category choices are All, Accessories, Education, Games, Graphics, Internet, Office, Other, Programming, Sound & Video, System Tools, and Universal Access. You can also select which type of software to show using the Show drop-down list or by entering a query in the Search box. The software type choices are All Available Applications, All Open Source Applications, Supported Applications, Third Party Applications, and Installed Applications Only. If you’re not sure which packages to try first, you can click the Popularity tab to rank items from five stars to one star. Once you are satisfied with your choices, click Apply Changes to proceed. You’ll see a confirmation dialog box, listing the items to be installed or uninstalled. Click the Apply button to confirm the changes, and you will be prompted for your password. After you’ve entered your password, the installation or uninstallation process will commence. The system will notify you when the process has been completed. Package Management from the Command Prompt Synaptic is one of the best examples of package management programs around, and there’s little reason to shun it and choose to install packages from the command line. However, you may find occasions to use dpkg or the APT tools. For example, if you’re already working at the command line, then this method is quicker than starting up the Synaptic Package Manager. Using dpkg The most basic package-manipulation command is dpkg. dpkg allows you to perform a lot of package-related tasks, such as building packages from scratch. Here, we’ll look at simple package installation, removal, and query functions. ■Note dpkg requires superuser powers to install or remove software, so the command must be preceded with sudo. If you simply wish to query the package database, dpkg can be run without superuser powers. The same is true of the APT tools discussed later in this chapter.
- 595. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 559 Installing Packages dpkg is useful when you’ve already downloaded a specific .deb package and would like to install it. Here is the command: sudo dpkg -i packagename.i386.deb You must specify the entire filename, rather than just the name of the program. ■Note Be careful when downloading .deb package files. Not all of them are guaranteed to be 100% compatible with Ubuntu, because the .deb package format is used within a variety of distros, such as Debian and Xandros. Your first choice should be to download packages that are specifically created for your installed version of Ubuntu. These will probably have the word ubuntu in their filenames. If these are not available, you should try downloading those created for Debian. Package files created for other distros might work, but should be tried only as a last resort. dpkg is quick and dirty, and although it will warn you about any dependency issues, it will still go ahead and install the package. After installation, it will run the package’s configuration scripts. But if there are missing dependencies, it won’t be able to configure the program to work on your system, because it probably won’t be in a usable state, as shown in the example in Figure 28-3. Figure 28-3. dpkg will warn about missing dependencies but will still install the package.
- 596. 560 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE If this situation arises, it’s up to you to install the dependencies that dpkg lists (several packages can be specified with the dpkg command, in any order; dpkg will sort them out itself). Of course, some of these will have their own dependencies, which will also need to be installed. This cascade situation is known as dependency hell, as discussed earlier in the chapter, and is the main reason why the APT system was invented. As you’ll see in the next section, APT effortlessly handles dependency issues. If the dependencies aren’t met after a dpkg installation, whenever you run the Synaptic Package Manager or attempt to use the APT tools, you’ll be told of “broken” packages or unmet dependencies. APT will refuse to install any other software until the problem is fixed. Synaptic Package Manager will attempt to fix the problem automatically—the missing packages will be selected for installation and will be installed alongside any soft- ware you choose. At the console, you can type sudo apt-get -f install. This will install all of the missing dependencies on the system. ■Tip Within the Synaptic Package Manager, you can click the Custom Filters button at the bottom left and then click the Broken entry in the filter list in order to see any packages that have unmet dependencies. Uninstalling Packages To remove a package, type the following: sudo dpkg -r packagename Note that you simply need to type the name of the program, without its version number or the .i386.deb file extensions. In this case, dpkg is slightly better behaved than when installing software. If there are any reverse dependencies (other packages that depend on the one you’re trying to remove), you’ll be stopped in your tracks with a couple of error messages. You’ll need to resolve the reverse dependencies first; of course, they might also have their own reverse dependencies. Welcome back to dependency hell! ■Note The dpkg -r command will remove the package but leave behind its configuration files. This is handy if you install the software again in the future. In order to remove the configuration files in addition to the software, type sudo dpkg -P packagename.
- 597. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 561 Querying Packages dpkg includes a couple of query facilities that display details about packages. You can find out if a package is installed by typing this: dpkg -l packagename If you want to find out every bit of information about an installed package, including what dependencies it has, use the following command: dpkg -s packagename | less This example pipes the output of dpkg into less so you can read it more easily, because it’s likely to fill several terminal window screens. You can also use dpkg to query an installation file you’ve just downloaded: dpkg -I packagename.i386.deb | less All said, dpkg is an often undervalued tool that’s capable of some handy low-level package management tasks. Take a look at its man page to learn more. Using the APT Tools dpkg is the only option if you want to install a package file you’ve just downloaded. However, if you wish to utilize software repositories at the command line, you’ll need to use the APT tools apt-get and apt-cache. These still use dpkg in the background to install and remove packages, but they also feature intelligence to handle dependency management. ■Note If, while using dpkg or APT, you get an error message along the lines of, “Can’t get a lock,” make sure that the Synaptic Package Manager or Update Manager program isn’t open. Only one piece of software can access the package database at any one time. Installing and Removing Packages The most basic APT command is apt-get. You can use this command to install or remove packages contained within the repositories as follows: sudo apt-get install packagename sudo apt-get remove packagename
- 598. 562 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE You should specify the program name without the version number. You can specify two or more programs to be installed and/or removed at the same time. Just separate the package names with a space: apt-get install package1 package2 package3 ■Note On very rare occasions, there are several different versions of the same software in the repository. In such cases, version numbers sometimes are used. But this isn’t something you should worry about. To install the links web browser, for example, you just need to type the following command: sudo apt-get install links Figure 28-4 shows the results. As you can see, apt-get will check dependencies, down- load the software, and then install it. It’s a much better way of working compared with dpkg. Figure 28-4. You can use apt-get to install, remove, and update packages at the command line. It’s a similar situation when it comes to uninstalling software. For example, suppose you tried to remove the Evolution e-mail client, like so: sudo apt-get remove evolution
- 599. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 563 apt-get would also mark for removal evolution-exchange and evolution-plugins, two packages that depend on the e-mail client. But before doing anything, it will tell you what it is about to do and ask you to confirm it. Similarly, if you tried to install the AbiWord word processor, like so: sudo apt-get install abiword-gnome you would be informed that an additional package needs to be installed: abiword-common. It will be automatically added to the list of packages that are to be installed. As with the Synaptic Package Manager, apt-get will also list suggested and recom- mended packages that will complement the software you wish to install but aren’t vital. However, if you wish to install those packages, you’ll need to do that later, in a separate apt-get command. ■Tip An alternative to the command-line APT tools is aptitude. This can be used like APT tools such as apt-get, but can also take into account suggested and recommended packages. For more information, see its man page. Querying Packages and Repositories To search the repository databases for particular software packages, use the apt-cache command: apt-cache search packagename Both descriptions and package names are searched. The list of results will show the package name on the left and a description on the right. Sometimes, the results can scroll off the screen, so it’s useful to pipe the output into less: apt-cache search packagename | less You can also find out about dependencies and suggested packages using apt-cache. Once again, it’s a good idea to pipe the output into less, because the dependency list may run off the screen: apt-cache depends packagename | less You can read the program description for a package file by typing the following (see Figure 28-5 for an example): apt-cache show packagename | less
- 600. 564 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE Figure 28-5. You can query any package using apt-cache show to learn more about it. None of these commands makes a distinction between installed and uninstalled packages—you’re accessing the details held in the repository database. Before searching for packages, it’s a good idea to make sure you have the latest package lists in the database (the equivalent of clicking the Reload button in the Synaptic Package Manager). To refresh the repository data, use this command: sudo apt-get update Updating the System apt-get can also perform various types of system updates. To update all the packages on your system to the latest versions contained within the repositories, type the following: sudo apt-get upgrade This is the command-line equivalent of using the Update Manager function of the Ubuntu desktop. To upgrade the system to the latest version of Ubuntu (if there is one), type this: sudo apt-get dist-upgrade
- 601. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 565 Updating your system can take a long time, depending on the number and size of files to be downloaded. In addition, each package will need to configure itself during installa- tion, and this can also take a long time. DECODING PACKAGE FILENAMES Although the filenames of packages might seem like cryptic mumbo-jumbo, they actually tell you a great deal about the file. Let’s take a look at the package file of the Eye of GNOME image viewer to explain this: eog_2.21.92-0ubuntu1_i386.deb The first element of the filename is the name of the program. In this case, Eye of GNOME has been abbreviated to eog. Abbreviations like this are quite common, because they decrease the length of the filename. But it’s important to note that they will be consistent. For as long as Eye of GNOME is supported as a package under Ubuntu, its package filename will always begin with eog. Following the name of the package is the version number of the program in question: 2.21.92-0. This is almost always the version number that will appear if you click Help ➤ About when the program is running and is the version number decided on by the developer who created the software. After the version number is the word ubuntu, which indicates that this is a package that has been created specifically for the Ubuntu distribution of Linux. Then you see the build version number of the package: 1. This is Ubuntu’s own version number, indicating how many times the package has been built (created) by the Ubuntu team. Sometimes, it’s necessary to release an updated build of the same version of a program in order to correct an error that was accidentally introduced in the last build version. Sometimes, the program is patched by the Ubuntu team to support a new function. After Ubuntu’s build version number is the platform on which the package will run. In this case, i386 indicates that the package will run on all x86-based processors, from 80386 upward (the 486, Pentium, Pentium II, AMD processors, and so on). Sometimes, you might see i686, which means that the package has been optimized for Pentium Pro chips and above (Pentium II, III, IV, and AMD’s Athlon range of chips). If the package is created for 64-bit desktop processors, then amd64 will appear there. Optimized versions of packages for particular processors are used only when they might bring a performance boost. For example, there are i686 versions of the Linux kernel and the libc6 library. Even ordinary programs, like OpenOffice.org, can be optimized for their architectures, but the majority of packages that are used under Ubuntu have the i386 designation. Managing Software Repositories It’s unlikely that, in general use, you’ll need to add, remove, or otherwise manipulate the list of software repositories, above and beyond what we’ve described in Chapter 18, when you enabled the Skype repository.
- 602. 566 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE The list of repositories is held within the /etc/apt/sources.list file and also in the /etc/apt/sources.list.d/ directory. You can administer this either by using the Software Sources program or by directly editing it. Although it’s not a complicated file to under- stand, we don’t advise making manual edits; in most cases, the Software Sources program will do all you need. However, we explain both approaches in the following sections. Using Software Sources The Software Sources program can be found on the System ➤ Administration menu. Although you can use it to add and remove third-party repositories, it’s designed to let you tweak settings relating to the official repositories, which are set up by default. The program contains five tabs, which offer the following functionality: Ubuntu Software: This tab lets you choose the repository components. You can choose to activate Main (Canonical-supported open-source software), Universe, Multiverse, Restricted, and Source Code components. Additionally, you can choose whether Ubuntu connects to a regional repository server (that is, one in or near your country) or the main Ubuntu server. Simply select the one you want from the Download From drop- down list, or try the Select Best Server button for automatic configuration. Connecting to a regional server is likely to result in faster service. If you’re outside the United States, you can also opt to connect to the Server for United States. Third-Party Software: This tab lets you add your own selection of repositories. These can be online or on a CD/DVD-ROM. When you click Add, you’ll be asked to supply the APT line, which should be the line as it would appear in the /etc/apt/ sources.list file, discussed in the next section. However, once a line has been added, you can double-click it in the list to see a more user-friendly dialog box, which splits the category and component fields into separate text boxes. Updates: This tab lets you select the types of updates you would like to download. Effectively, it lets you choose a repository category. You can choose to connect to Proposed Updates and Backported Updates, in addition to Security Updates and Recommended Updates, as shown in Figure 28-6. You can also set when to check for updates, and whether you want to be informed of all new releases of Ubuntu or just the long-term support releases every few years. Additionally, you can select to automatically install security updates without being prompting first. This is not a bad idea, considering many are considered vital for the safety of your system. ■Note On the Updates tab, it’s not possible to add or remove the Main category. It’s assumed that you’ll want to be connected to that in order to download new software.
- 603. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 567 Figure 28-6. The Updates tab lets you choose which repository categories you wish to use. Authentication: Package files within repositories are usually digitally signed by their creators. This is a way of proving that they haven’t been tampered with. Your computer can check the digital signature, but it needs a copy of the signing key for the relevant repository. If the key is missing, you’ll be warned within Synaptic Package Manager that the package can’t be authenticated when you try to install it (although it’s still possible to install the package after this). Two signing keys are added to Ubuntu by default—one for the installation DVD-ROM and one for the online archive—but you can add more, such as those for third-party repositories that you’ve added manually. The Authentication tab lets you do this. Using a web browser, download the key file from the server (right-click the file and select Save As), and then click the Import Key File button. In the Open dialog box, select the file and click OK. The key will then be instantly imported. Statistics: Here, you can opt into an attempt by the Ubuntu developers to monitor which packages are most popular. This will help shape future releases of Ubuntu and also improve the rank of the applications you choose in the Add/Remove Applica- tions program. Simply put a check in the Submit Statistical Information box if you would like to participate.
- 604. 568 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE Adding/Removing a Repository at the Command Line The /etc/apt/sources.list file is at the heart of the APT system and contains details of all the package repositories you’re subscribed to, as well as the individual categories within each repository. You can edit the file within vim by opening a terminal window (Applications ➤ Accessories ➤ Terminal) and typing the following: sudo vim /etc/apt/sources.list The sources.list file usually contains two types of entries: those beginning with deb, which indicate a standard repository containing binary files, and those beginning with deb-src, which indicates a source file repository. deb-src entries are largely for developers. Here’s an example line from sources.list on a test system: deb http://us.archive.ubuntu.com/ubuntu/ hardy main restricted As you can see, the first component of the line is the address of the server. Then the repository category is listed: hardy. If the server offered updates, this might read hardy-security or hardy-updates. Following this, the repository components are listed: main and restricted. A hash symbol (#) at the beginning of a line in sources.list means that it’s ignored. This can be useful for disabling a repository in a situation where you don’t necessarily want to remove it from the file. In addition, as you can see within the file, some explana- tory comments from Ubuntu developers are inserted into the file and are preceded by a hash symbol, so that APT doesn’t attempt to interpret them. Adding a new repository is easy. For example, to add the Skype repository, in order to download the Skype VoIP software, switch to insert mode within vim (by typing i), and then type the following: # added by Keir, 4 May 08 deb http://download.skype.com/linux/repos/debian/ stable non-free As you can see, we’ve added a comment to identify who added the line and when. You’ll notice something interesting about the actual deb line. The Skype server’s repository category and components aren’t like the others in the sources.list file. The category is stable, and the component is non-free. In this case, the Skype server uses the Debian method of naming repository categories and components, which is different from Ubuntu’s way.
- 605. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 569 Once you’ve added a new repository, don’t forget to refresh your local list of packages. If you don’t do this, APT won’t be aware of the software contained in the new repository. Refresh the list by typing the following at the command prompt: sudo apt-get update This should also be done after you remove or disable a repository within sources.list. Installing from Source Back in the old days of Unix, the only way to install many software packages was from source code, a process known as compiling. This was because most people edited the source code themselves, or at least liked to have the option of doing so. Nowadays, inno- vations such as the Debian package management system make compiling all but redundant for the average user. But knowing how to compile a program from source is still a good Linux skill to have. In some cases, it’s your only option for installing certain programs, because you may not be able to find a packaged binary. Program compilation is usually handled at the command prompt. It’s not the kind of thing you would do via a GUI program. Installing the Compiler Tools Before you can compile from source, you need to install several items of software: the make program, which oversees the process of creating a new program, and the GNU Compiler Collection (GCC), which does the hard work of turning the source code into a binary. In addition, if the software relies on certain library files, you’ll need to install development (dev) versions of them, as well as the libraries themselves if they’re not already installed. For example, if you’re compiling a program to run under the GNOME desktop, you’ll need development versions of the GTK2+ libraries. Under Ubuntu, it’s possible to install all the program-compilation tools you need by installing the build-essential metapackage. You can use the Synaptic Package Manager or the following apt-get command at the command prompt: sudo apt-get build-essential
- 606. 570 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE Unpacking the Source Tarball and Solving Dependencies Let’s take a look at installing a program from source. Dillo is a stripped-down web browser that’s designed for speed and small file size. It’s a fun little program that’s good to have around in the event of your main browser developing a glitch that you can’t fix. The Dillo home page is www.dillo.org, so head over there, and choose to download the latest version of the source code. ■Note Okay, you got us. If you use apt-cache or the Synaptic Package Manager to look through the repositories, you’ll see that Dillo is available as a ready-to-install package. But Ubuntu’s package repositories are so comprehensive that, frankly, we couldn’t find anything to demonstrate program compilation that wasn’t already in there! The first thing to do is to unpack and uncompress the tarball (if you wish to learn more about the tar command, see Chapter 31): tar jxf dillo-0.8.6.tar.bz2 Of course, you should replace the filename with that of the version you downloaded. Next, you’ll need to switch into the source code directory and take a look at the README file. This will tell you what dependencies Dillo has and also any caveats you may need to take into account in order to compile Dillo on a Linux system: cd dillo-0.8.6 less README ■Note Unlike binary packages, source code is rarely designed with one specific Linux distribution in mind. For example, Dillo is able to compile on all types of Unix, including Linux, Solaris, BSD, and others. With a little work, it might even be possible to compile it under Windows! First, you see that Dillo needs the glib libraries. This is a given on nearly all Linux systems, but in order to compile, Dillo will need the dev version of glib, which isn’t part of the default Ubuntu installation. Next, you read that it also needs the GTK+ 1.2 libraries. These are present on the majority of GNOME-based Linux desktop systems, but once again, the dev versions will need to be installed. Beneath that in Dillo’s list of requirements is support for JPEG and PNG image formats, which are definitely installed on the average Linux system, and the Wget download tool,
- 607. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 571 which is also included with most versions of Linux (although it’s a good idea to use the Synaptic Package Manager or apt-cache search to check that it’s installed). After finding out about dependencies, you should scroll down the README to look for any notes about compiling under Linux. It turns out there might be some issues with older 2.4 versions of the Linux kernel, but Ubuntu uses 2.6, so this isn’t an issue. So, in short, before you can compile Dillo, you need to install dev versions of the glib and GTK+ 1.2 libraries. You can install these via the Synaptic Package Manager or apt-get. It will help cut down the search results if you realize that system library packages under Ubuntu are usually prefaced with lib. So, search for the dev versions of libgtk and libglib. Doing so on our test system returned three likely packages: libglib1.2-dev, libglib2.0-dev, and libgtk1.2-dev. There are two libglib entries, because our system has both glib2 and the older glib1.2. To ensure compatibility, we decided to install dev versions of both. Since you’re working at the command prompt, install the packages via apt-get: sudo apt-get install libglib1.2-dev libglib2.0-dev libgtk1.2-dev As soon as we typed this, it turned out that libgtk1.2-dev came with a host of depen- dencies in the form of X server dev libraries. The reasoning is that if the GTK+ dev library files are needed, these other libraries are often needed, too. Whatever the case, there’s no harm in installing them. Compiling Now comes the exciting process of compiling the program! This is done via three commands, issued in sequence: ./configure make sudo make install The first command starts the configure script, created by the Dillo programmer, which checks your system to ensure that it meets Dillo’s requirements. In other words, it checks to make sure the glib and GTK+ libraries are present. It also checks to make sure you have the correct software that’s required to actually compile a program, such as GCC and make. It’s when the configure script is running that something is most likely to go wrong. In that case, more often than not, the error message will tell you that you’re missing a depen- dency, which you must then resolve. ■Note Some configure scripts are very thorough and check for components that the program you’re trying to install might not even need. Because of this, you shouldn’t worry if, as the text scrolls past, you see that various components are missing. Unless configure complains about it, it’s not a problem.
- 608. 572 CHAPTER 28 ■ INSTALLING A ND REM OVING SOFTWARE The next command, make, takes care of the actual program compilation. When it’s run, the screen will fill with what might look like gibberish, but this is merely the output of the GNU compiler. It provides a lot of valuable information to those who know about such things, but you can largely ignore it. However, you should keep your eyes peeled for any error messages. It’s possible that the configure script did not check your system thoroughly enough, and you might be missing an important system component; in which case, make will halt. ■Note We saw an error message at the end of the make session when compiling Dillo. We were able to follow up with the sudo make install command, which also reported error messages. However, we found that Dillo worked fine! The moral of the story is that software compilation is something of a black art, with error messages designed for programmers, and not all error messages are fatal. Alternatively, the program simply might not be able to compile on your system without some tweaking to the Makefile (the file that make uses). If such a situation arises, the best plan is to visit the web site of the developer of the software and see if there’s a forum you can post to. Alternatively, check if the developer has an e-mail address you can contact to ask for help. Eventually, the compilation will stop with a number of exit messages. Then the final command must be run: make install. This needs to be run with superuser powers, because its job is to copy the binary files you’ve just created to the relevant system directories. In addition, any documentation that comes with the program is also copied to the relevant location on your system. Once the three commands have completed, you should be able to run the program by typing its name at the command prompt. If you’ve been playing along at home and have compiled Dillo, you can run it by typing dillo. Figure 28-7 shows Dillo running under Ubuntu. ■Note You’ll probably need to add your own icon for Dillo to the desktop or Applications menu. Source packages are usually designed to be installed on any version of Unix running a variety of desktop managers. In the past, it was difficult for the developer to know where to create desktop shortcuts, but now organizations like freedesktop.org (http://freedesktop.org) are standardizing the process.
- 609. CH A PT ER 2 8 ■ I NS TA LLIN G AND RE MOV IN G SO F TWARE 573 Figure 28-7. Dillo in action—a certain satisfaction comes from compiling a program from source code. Summary This chapter described how to install software under Ubuntu. We’ve looked at how this differs from Windows software installation, and how the Debian package management system is designed to make life easier. You learned how to use the Synaptic Package Manager to install software under the GUI, and how to use the dpkg and APT tools to install software at the command-line prompt. Finally, we looked at how programs can be compiled from their source code, which is a fundamental process for all versions of Linux. In the next chapter, we’ll look at how to administer the user accounts on the Ubuntu system.
- 611. CHAPTER 29 ■■■ Managing Users L inux was designed from the ground up to be a multiuser system. When powerful Linux machines are deployed in huge data centers, they are capable of serving hundreds, if not thousands, of users at the same time. In a more domestic setting, such as when Ubuntu is installed on a desktop PC, multiuser means that several family members can have their own login on the PC. They’ll get their own desktop environment that is separate from that of the other users and their own file storage area. And even if you’re the only person using your PC, you can still take advantage of Ubuntu’s multiuser capabilities. Consider creating user accounts for various aspects of your life— perhaps one for work and one for time spent browsing the Web. Each user account can be tailored to a specific need. In this chapter, you’ll learn how to administer multiple user accounts. Understanding User and Group Accounts The concept of users and file ownership was explained in Chapter 14, but let’s take a moment to recap and elaborate on some important points. Users and Groups Each person who wishes to log in to Ubuntu must have a user account. This will define what that user can and cannot do on the system, with specific reference to files and folders. Because Ubuntu is effectively one large file system, with even hardware devices seen as individual files (see Chapter 14), this means that user permissions lie at the heart of controlling the entire system. They can limit which user has access to which hardware and software, and therefore control access to various PC functions. Each user also belongs to a group. Groups have the same style of permissions as indi- vidual users. File or folder access can be denied or granted to a user, depending on that person’s group membership. 575
- 612. 576 CHAPTER 29 ■ MA NA GING USERS ■Note As in real life, a group can have many members and can be based around various interests. In a business environment, this might mean that a group is created for members of the accounting department and the human resources department, for example. By changing the permissions on files created by the group members, each group can have files that only the group members can access (although, as always, anyone with superuser powers can access all files). On a default Ubuntu system with just a handful of users, the group concept might seem somewhat redundant. However, the concept of groups is fundamental to the way Ubuntu works and cannot be avoided. Even if you don’t make use of groups, Ubuntu still requires your user account to be part of one. In addition to actual human users, the Ubuntu system has its own set of user and group accounts. Various programs that access hardware resources or particular sets of files are part of these groups. Setting up system users and groups in this way makes the system more secure and easier to administer. Root User On most Linux systems, the root user has power over the entire system. Root can examine any file and configure any piece of hardware. Root typically belongs to its own unique group, also called root. Ubuntu is different from most Linux distributions in that the root account isn’t used by default. Instead, certain users, including the one set up during installation, can “borrow” root-like, or superuser, powers by simply typing their login password. This is done by preceding commands with sudo or gksu at the command-line prompt or as needed when using GUI programs that affect system settings. For some programs, including System ➤ Administration ➤ Users and Groups, you need to click an Unlock button to gain superuser powers. Until you unlock the Users and Groups program, most of the buttons are grayed out and unusable. If you wish, you can activate the root user account on your system for administration purposes. To activate the root account, use the following command in a terminal window (see Chapter 13 for details on issuing commands in a terminal window): sudo passwd root After typing your own login password, you’ll be invited to define a password for the root user. Because of its power, the root user can cause a lot of accidental damage, so by default Ubuntu prevents you from logging in as root. Instead, you can switch to being the root user temporarily from an ordinary user account by typing the following in a terminal window: su
- 613. CHAPTER 29 ■ MANAGING USERS 577 You will be prompted for the root password, and then given root powers for as long as you need. When you’ve finished, type exit, and you’ll be returned to your ordinary user account. ■Tip You can tell when you’re logged in as the root user because the command prompt will end with a hash symbol (#). When logged in as an ordinary user, it ends with a dollar sign ($). The hash symbol should be seen as a warning that you now have unrestricted control over the system, so be careful what you type and double- check everything before hitting Enter! As an alternative to setting the root password, you can simply type the following when- ever you want to switch to the root user account: sudo su You’ll be prompted for your login password, in exactly the same way as if you had just preceded a command with sudo. After this, you’ll have the powers of the root user. To quit the root user account, type exit. UIDs and GIDs Although we talk of user and group names, these are only provided for the benefit of humans. Internally, Ubuntu uses a numerical system to identify users and groups. These are referred to as user IDs (UIDs) and group IDs (GIDs), respectively. Under Ubuntu, all the GID and UID numbers below 1000 are reserved for the system. This means that the first non-root user account created during installation will probably be given a UID of 1000. In addition, any new groups created after installation are numbered from 1000. On one test system, the default user of keir had a UID of 1000 and a GID of 1000. The second user we added was given a UID of 1001. ■Note UID and GID information isn’t important during everyday use, and most commands used to admin- ister users, groups, and file permissions understand the human-readable names. However, knowing about UIDs and GIDs can prove useful when you’re undertaking more complicated system administration. Adding and Deleting Users and Groups The easiest and quickest way to add a new user or group is to use the Users and Groups tool under the System ➤ Administration menu. Of course, you can also perform these tasks through the command line.
- 614. 578 CHAPTER 29 ■ MA NA GING USERS Adding and Deleting Users via the GUI To add a new user, select System ➤ Administration ➤ Users and Groups. Click the Unlock button. In the authentication window, supply your password and click Authenticate. Next, click Add User. You’ll see the New User Account dialog box, as shown in Figure 29-1. Figure 29-1. Adding new users and groups is easy with the Users and Groups program. Fill out the fields on the Account tab, and optionally the User Privileges and Advanced tabs, as follows:
- 615. CHAPTER 29 ■ MANAGING USERS 579 Account tab: As during initial installation (see Chapter 5), you’re invited to enter a username as well as a real name. The username is how the user is identified to the system, while the real name is how the user will be identified to other users. Beneath this, you can select the profile you want the user to have—Administrator, Desktop User, or Unprivileged. Users with the Administrator profile can use sudo or gksu to administer the system. Although Desktop Users can’t use these commands, they do have access to most other system resources. The Unprivileged profile removes access to virtually all resources, including external storage devices. Effectively, this is a lock- down account, although such users are still allowed to go online. For most users, the Desktop User profile is a good choice. Below the Profile setting, you can optionally enter contact information. In the Password area, an initial password for the user is required. You can enter it in the text box (and confirm it below) or let the system generate a random password from letters and numbers, but this may be harder for the user to remember. User Privileges: The settings on this tab offer much more control over what a user can and cannot do on the system. Here, you can prevent users from using certain hard- ware, such as scanners or modems. You can also control whether the user is able to administer the system. Simply put a check alongside any relevant boxes. Advanced: Here, you can alter additional settings if you wish. If you’re not sure about these parameters, it’s best to leave the default settings alone. You might like to change the main group for the user. By default, the user will belong to a newly created group based on the user’s own username. For example, if you add the user john, he will be added to the group john. This private group approach enforces a more stringent policy regarding personal file access. Alternatively, you could create a single group and assign several users to that group for file-sharing purposes. We’ll discuss adding and removing groups in the next section. ■Caution Many groups are listed in the Main Group drop-down list. Nearly all of these relate to the way the Linux operating system works and can be ignored. You should never, ever delete any of these groups! Deleting a user is simply a matter of highlighting the username in the list and clicking the Delete button. Note that the user’s /home directory won’t be deleted. You must do this manually with superuser powers, and it’s best accomplished from the command-line prompt (see Chapter 13 for an introduction to basic file-manipulation shell commands).
- 616. 580 CHAPTER 29 ■ MA NA GING USERS Creating and Deleting Groups via the GUI Adding a group is simply a matter of clicking the Manage Groups button in the Users and Groups program window (System ➤ Administration ➤ Users and Groups). Don’t forget to click the Unlock button, if you haven’t already done so. After clicking the Add Group button, you’ll be prompted to give the group a name. The GID will be filled in for you auto- matically, but you could choose a different number if you have good reason to do so. (Remember to use a number above 1000, to keep in line with the way Ubuntu operates.) It isn’t essential that you add users to the group there and then, but a list of users is provided at the bottom of the dialog box. Put a check alongside any user to grant that user access to your group. ■Note Bear in mind that users can be members of more than one group, although all users have a main group that they belong to, which has the GID assigned to files they create. As with user accounts, deleting a group is simply a matter of highlighting it in the list and clicking the Delete button. You should ensure that the group no longer has any members before doing this, because Ubuntu won’t prevent you from removing a group that has members (although it will warn you that this is a bad thing to do). ■Note Ubuntu appears to offer protection against the havoc caused by deleting a group that is the main group of users on your system. When we deleted an entry that was the main group of a different user, and then logged in as that user, the group was automatically re-created! You shouldn’t rely on this kind of protec- tion, however, and should always check before deleting a group. Adding and Deleting Users and Groups at the Command Line You can create new users at the command-line shell by using the useradd command. This command must be run with superuser powers, which is to say that it must be prefaced with the sudo command. The command to add a user is normally used in the following way: sudo useradd -m <username> The -m command option tells the command to create a home directory for the user. Used on its own, useradd merely updates system files with the new user’s details and nothing else. There are several other useful command options, which can be discovered by a quick
- 617. CHAPTER 29 ■ MANAGING USERS 581 browse of the command’s man page. You can’t log in to the new user account you have just created until a password is assigned, as discussed in the next section. Creating a new user this way will automatically create a new group, which will have a title that’s exactly the same as the username you just created, and add this user to it. Adding a new group is just as easy as adding a new user: sudo groupadd <groupname> To specify a different main group when creating a new user, use the -g switch: sudo useradd -m -g <groupname> <username> For example, the following command creates a user called raymond and adds him to the main group users: sudo useradd -m -g users raymond Note that the specified group will need to be created first; it won’t be created automat- ically by the useradd command. In this particular example, the group users is a standard one, and should already be present on your Ubuntu system. Although it’s easy to do, creating users and groups at the command line is not advised, because there are a handful of annoying issues. One issue is that the new user is assigned the Bourne (sh) shell environment, rather than BASH, as is the default under Ubuntu. This can be overcome by the user simply typing bash at the command line after he has logged in. ■Note For a permanent change to the user’s shell, edit the /etc/passwd file. You’ll need administrator powers to do this. Look for the line that begins with the name of the new user, probably at the end of the file, and change the end of the line to read /bin/bash, rather than /bin/sh. Be extremely careful editing this file! It’s a central file without which your system could not operate. Ensure you make only the edit described here. But there’s another, more annoying issue relating to groups when you’re creating a user account at the command line. Most users are members not only of their own group, but also of several system groups. These groups relate to various hardware and software functions. For example, membership of the cdrom group may be required if the user wants to be able to use the CD or DVD-ROM drive. Strictly speaking, you should add new users to these groups if they’re to make full use of the system. These groups are described as supplementary groups, as opposed to the main group that is assigned to files the user creates.
- 618. 582 CHAPTER 29 ■ MA NA GING USERS Use the id command to display user and group information. On our test system, typing the following: id keir revealed the following groups: uid=1000(keir) gid=1000(keir) groups=1000(keir),4(adm),20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44 (video),46(plugdev),106(fuse),108(lpadmin),114(admin) All those after the main group, 1000(keir), are supplementary groups. For a list of what they do, see Table 29-1. Table 29-1. System Groups Within Ubuntu Group Definition adm Used for system logging dialout Required for use of serial port devices, such as older modems cdrom Allows the user to access the CD/DVD-ROM floppy Allows the user to access the floppy disk drive audio Enables sound output for the user dip Required for use of dial-up modems video Allows video acceleration for the user plugdev Allows the user access to removable storage, such as card readers, digital cameras, and so on fuse Allows the user to mount file systems in user space lpadmin Allows the user to administer the printer admin Gives the user system administration abilities (superuser powers) As you might have guessed, to manually add a user under Ubuntu, you must not only create a group and then add the user to it, but you must also add that user to the required selection of supplementary groups. Some are mandatory for effective use of the computer, such as audio, while others are optional, depending on how much freedom you want to afford the new user. You can add a new user to supplementary groups by using the -G (an uppercase G) switch with the useradd command. Here’s how to add a new user called raymond to the
- 619. CHAPTER 29 ■ MANAGING USERS 583 system so that he is able to make full use of the system (having first created a group called raymond): sudo useradd -m -g raymond -G adm,dialout,cdrom,floppy,audio,dip,video,plugdev, fuse,lpadmin,admin raymond Additionally, creating a new user using useradd won’t automatically apply a password to the account. Ubuntu can’t work accounts unless they have a password, so until one is applied, the new account will be locked. A user with administrative powers can assign a password using the passwd command, as discussed in the next section. Deleting a user is mercifully simple compared to this! Use the userdel command, as follows: sudo userdel <username> This command alone won’t remove the user’s /home directory, however. To accomplish this task, add the -r switch to delete the user and the user’s /home directory, like so: sudo userdel -r <username> Similarly, to delete a group, use the groupdel command: sudo groupdel <groupname> Note that you won’t be able to remove a group if it’s an existing user’s main group. Adding and Changing Passwords On a default Ubuntu installation, ordinary users are able to change their own password in a terminal window. The command for any user to change her own password is simple: passwd The user will be asked to confirm her current password, and then to enter the new password twice, to make sure that it has been typed correctly. Alternatively, by adopting superuser powers, a user can change the password of another account: sudo passwd <username> This is necessary after you create a new user account on the command line with useradd, because the new user isn’t given a password automatically. For obvious security reasons, Ubuntu won’t allow blank passwords. You can enter just about anything as a password, but you should bear in mind some common-sense rules. Ideally, passwords should be at least eight characters long and contain letters, numbers, and even punctuation symbols. You might also want to include both uppercase and lowercase letters, because that makes passwords harder to guess.
- 620. 584 CHAPTER 29 ■ MA NA GING USERS A number of command-line options can be specified with the passwd command when it is invoked with superuser powers. For example, the -l option will lock the specified account so that it can’t be accessed (the -u option will unlock it). ■Tip You can temporarily switch into any user account by typing su <username>. When you’ve finished, simply type exit to return to your own account. Remember that typing su without a username will give you root powers, so be careful. Summary In this chapter, we looked at the principles behind user and group accounts under Ubuntu. We’ve examined how user and group accounts can be created, edited, and deleted using the GUI, as well as on the command line. We also looked at how passwords can be manip- ulated by individual users and by an administrator with superuser powers. In the next chapter, we’ll look at how the Ubuntu system can be optimized. You’ll also learn about several interesting and important system tools.
- 621. CHAPTER 30 ■■■ Optimizing Your System U buntu should prove to be as responsive in day-to-day operation as Windows, if not more so. But if you run into any performance issues, or if you simply want to get the most out of your system, then this chapter is for you. The chapter doesn’t cover essential knowledge, so you can skip it if you’re satisfied with how your system runs. More often than not it discusses hacks—clever methods of making things work in a nonstandard fashion. But as your experience of Ubuntu might have already taught you, such hacks are the lifeblood of Linux. One of the strengths of Linux is the ability to delve under the hood and change absolutely any aspect of the way it works. Speeding Up Booting Since Ubuntu 6.10 (Edgy Eft), Ubuntu has been using a boot routine called Upstart that effectively optimizes itself. You can learn more about Upstart at http://upstart.ubuntu.com. However, you can still make a performance tweak by enabling startup scripts to run in parallel, instead of one after the other. This works well for multithreaded, multicore processors, like Intel’s Core 2 Duo and AMD’s Athlon 64 X2. It won’t make the computer start instantly, but it will save a few seconds each time you boot. To configure running startup scripts in parallel, you need to edit the /etc/init.d/rc file. You can load this file into the Gedit text editor by typing the following in a terminal window: gksu gedit /etc/init.d/rc Look for the line that begins with CONCURRENCY near the top of the file, as shown in Figure 30-1, and change the value from none to shell. Save the file and reboot the computer. If you see no improvement in boot speed, you can change this value back to CONCURRENCY=none if you wish. 585
- 622. 586 CHAPTER 30 ■ OPTIMIZING YOUR S YS TEM Figure 30-1. Parallel execution of scripts in the boot process can be enabled by editing the /etc/init.d/rc file. Reducing the Boot Menu Delay Getting rid of the GRUB boot menu delay can save some waiting around in the early stages of the boot process. The delay can be reduced to one second, or even eradicated completely. Of course, in such a case, you won’t be able to choose which operating system you want to load if you’re dual-booting with Windows. Even if Ubuntu is the only operating system on your computer, without the boot menu delay, you won’t have the chance to boot into recovery mode or a previously installed Linux kernel from the GRUB menu. So you need to consider whether this is a worthwhile time-saving measure. The boot menu delay is stated in the /boot/grub/menu.lst file. You can load this into the Gedit text editor by typing the following in a terminal window: gksu gedit /boot/grub/menu.lst Look for the line that begins with timeout, as shown in Figure 30-2, and change the value to whatever you wish. The units are counted in seconds, so a value of 3 equates to three seconds. A value of 0 (zero) will mean the boot menu won’t appear at all, which is not recommended, for the reasons just mentioned. Generally speaking, a delay of one second (1) gives you just enough time to press a key at the appropriate time. This will
- 623. CHAPTER 30 ■ OPTIMIZING Y OUR SYS TEM 587 cancel the countdown, meaning the boot menu will stay on your screen until you select an option. Figure 30-2. You can stop the GRUB menu from hanging around for so long by changing the timeout value in its configuration file. When you’ve finished, save the file, and quit Gedit. Enabling Automatic Login The first component of user interaction Ubuntu requires is the input of a username and password. By default, Ubuntu will pause at the login screen indefinitely until the details are entered. Following this, the GNOME desktop will load, which can take another 30 seconds on an older computer. It’s possible to make Ubuntu log in to any particular account automatically, which will save time during boot (and will also allow you to activate your computer, leave the room, and come back to the computer ready for instant use). However, you should do this only if you’re confident your computer is in a secure loca- tion. After all, enabling automatic login will mean that anyone who has physical access to your computer will be logged in automatically and have access to your data.
- 624. 588 CHAPTER 30 ■ OPTIMIZING YOUR S YS TEM ■Note Once automatic login is enabled, you will still be able to log out by clicking System ➤ Quit and clicking the Log Out button. You will see the login screen, which you can use to switch to other user accounts. To enable automatic login, click System ➤ Administration ➤ Login Window. In the Login Window Preferences window that appears, click the Security tab, and put a check alongside Enable Automatic Login. Then choose the account that you would like to log in automatically from the User drop-down list, as shown in Figure 30-3. (If there’s only one user on your system, there will be only one entry in this list.) Click the Close button at the bottom right of the Login Window Preferences window to save your changes and exit. Figure 30-3. Automatic login can save precious seconds when booting, but represents a security risk.
- 625. CHAPTER 30 ■ OPTIMIZING Y OUR SYS TEM 589 Managing GNOME Sessions Under Windows, you might be used to controlling which programs start up at the same time as the desktop, by adding or deleting entries in the Start menu’s Startup program group. When running Ubuntu, you can control which system applets are started automat- ically, as well as your personal choice of desktop applications. To control which programs start up with the GNOME desktop, use the Sessions program (gnome-session-manager). To run the program, click System ➤ Preferences ➤ Sessions. Clicking the Startup Programs tab shows the programs that start when GNOME does, as shown in Figure 30-4. You can disable a startup program in the list by unchecking the Enabled check box beside it. Figure 30-4. In the Sessions Preferences window, you can control which programs start when GNOME does. On our test system, the following 12 entries were in the list; your computer might have more entries. Bluetooth Manager: This program is responsible for the Bluetooth applet that can be used to send and receive files, browse other Bluetooth devices, set up Bluetooth services, and manage Bluetooth service settings. You can disable this applet if your system is not Bluetooth-enabled, or if you just don’t want to use Bluetooth at all.
- 626. 590 CHAPTER 30 ■ OPTIMIZING YOUR S YS TEM Check for new hardware drivers: This tool scans your hardware devices and checks if new third-party proprietary drivers can be used with them. If a new driver is compat- ible, this tool provides a facility to download, install, and configure the driver in your computer. If your hardware devices are working perfectly without third-party drivers, or you’re uncomfortable using proprietary software, it is safe to disable this program. Otherwise, keep the tool enabled so that you can receive driver bug fixes and updates. Evolution Alarm Notifier: As its name suggests, this utility ties into Evolution’s calendar function in order to notify you of events, such as an appointment that you don’t want to forget. If you don’t use Evolution, or don’t use its calendar function, this applet can be disabled. Network Manager: This applet manages your Wi-Fi, Ethernet, and VPN connections. This is useful for laptop users who connect to several Wi-Fi networks on the go, as discussed in Chapter 8. You can disable this program if your network settings are static and always use the same IP address, DNS, and gateway settings when connecting to a particular local area network. Power Manager: This program controls all aspects of GNOME’s power management, including the useful hibernate feature that can save the contents of the system’s RAM to make for quicker startup. If your computer is a notebook, this tool should be considered essential. If you have a desktop PC and are looking to save power using hibernate, suspend, or screen blanking after a period of inactivity, you won’t want to disable Power Manager. Disabling it will remove the Suspend and Hibernate options from the System ➤ Quit dialog box. Print Queue Applet: This applet provides an interface for you to cancel or repeat printer jobs. It is also responsible for automatically setting up a printer for use when you plug in a printer. You can disable this applet if you will never print from your computer. Tracker and Tracker Applet: Tracker is the background process that indexes the contents and metadata of your home directory for fast searching. Tracker Applet is the tool for searching your data and customizing Tracker settings. By default, indexing is disabled unless you enable the indexing options in the Tracker Preferences window (System ➤ Preferences ➤ Search and Indexing). You should leave indexing disabled if using it slows down your computer; however, the benefits of obtaining fast results when searching your data are undeniable.
- 627. CHAPTER 30 ■ OPTIMIZING Y OUR SYS TEM 591 ■Note The Tracker Applet is still undergoing testing, and it is not known whether it will remain part of future Ubuntu releases. Update Notifier: This is the Update Manager tool. You shouldn’t disable this applet, because it performs the essential task of checking if any system updates are available. It runs in the background once started, and hardly impacts startup time at all. However, if you absolutely must prune valuable milliseconds from startup, you can disable it. You can then check for updates manually, whenever you desire, by clicking System ➤ Administration ➤ Update Manager. User folders update: This tool pop ups during the start of your session if you have recently changed the default language (System ➤ Administration ➤ Language Support) of your desktop. The tool gives you an option to translate the folder names Desktop, Templates, Public, Documents, Music, Pictures, and Videos in your home directory to the new default language. You can disable this tool if you don’t change your language settings. Visual Assistance: This utility runs assistive technologies such as the Orca screen reader, magnifier, and Braille application if these tools were enabled in the Assistive Technologies Preferences window (System ➤ Preferences ➤ Assistive Technologies). See Chapter 10 for a discussion of these tools. If you are not using assistive technolo- gies, you can disable this applet. Volume Manager: This program isn’t, as you might think, related to the sound system. Instead it allows the automounting of removable storage (known in Linux as volumes), such as digital cameras and CD or DVD-ROM discs. This is a critical function of Ubuntu and, without it running, you face the uphill struggle of manually mounting removable storage devices at the command prompt. You can disable it if you want, but it’s defi- nitely not advisable. The Current Session tab of the Sessions Preferences window provides a list of programs that are running at that exact moment. You can use this tab to test the effect of removing applications from the startup list, by highlighting the application, clicking the Remove button, and then clicking the Apply button. This will force the program to quit, so make sure you save any open files before closing an application this way, to avoid loss of data.
- 628. 592 CHAPTER 30 ■ OPTIMIZING YOUR S YS TEM The Session Options tab provides two ways to set your preferred applications to run automatically when you log in, instead of starting each application that you need manu- ally. If you choose the Automatically Remember Running Applications When Logging Out option, applications that are running as you log out will be started automatically when you log in next time. If you choose the Remember Currently Running Applications option, applications that were running just before you clicked this option will be started automat- ically when you log back in. ■Tip The Startup Programs tab of the Sessions Preferences window contains an Add button, which lets you add any program you like to the GNOME startup. You could add Evolution, for example, so that it starts auto- matically whenever you log in. But it’s easier to add currently running applications using the option on the Session Options tab. STOP WAITING FOR AN ADDRESS If you use an Ethernet or Wi-Fi connection to access your network, you might find that Ubuntu spends a few seconds during each boot acquiring an Internet address. This will be characterized by a long pause while nothing seems to be happening. Therefore, one way to provide an instant speed boost is to give your computer a static IP address. Chapter 8 explains how to configure your network interface. However, to assign a static address, you’ll need to find out what IP address range your router (or other DHCP server) uses. This can be discovered by looking at the router’s configuration software. Sometimes, this is accessed via a web browser. Look for the section of the web interface headed DHCP Configuration or similar. Normally, IPv4 local area network addresses are in the 192.168.x.x range, where x.x can be any series of numbers from 1.1 to 255.255. For instance, you may find that your router uses the 192.168.1.2-255 range. In this case, assigning a static IP address that will work with the router is simply a matter of choosing an IP address in this range. However, this router may hand out addresses sequentially from 2 upward, so it’s best to choose an address it’s unlikely to reach, even if you happen to have many computers connected to the network. Starting at 50 is a good idea, so you could assign the address 192.168.1.50. Don’t forget that when defining static IP addresses, you’ll need to manually supply the gateway, subnet, and DNS addresses. In the example, the gateway would be 192.168.1.1 (the address of the LAN interface on the router), and the subnet would be 255.255.255.0. The DNS address on a small home network will probably be the same as the gateway address, because the router will usually be set to forward DNS requests by default. This isn’t always the case, though, so be sure to check.
- 629. CHAPTER 30 ■ OPTIMIZING Y OUR SYS TEM 593 BUILD YOUR OWN READAHEAD PROFILE Ubuntu includes a feature called readahead, which is able to order the list of files to be loaded during bootup by their locations on the hard disk. A default readahead list is installed on a standard Ubuntu installation. This is created on a generic PC, but you can build your own version of the list, customized for your own computer. Here are the steps to create your own readahead list: 1. Reboot Ubuntu, and at the boot menu, highlight the Ubuntu entry and press E. If Ubuntu is the only operating system on your computer (that is, your computer doesn’t dual-boot with Windows), you might need to press Esc to see the boot menu when prompted. 2. Highlight the second line, beginning with the word kernel, and press E again. 3. Using the right-arrow key, move the cursor to the end of the line. Insert a space, type profile, and press Enter. The following is how the entire line read on our test PC; yours may be slightly dif- ferent (note that the beginning of the line was cropped off because of the resolution of the screen): < quiet splash profile 4. Press B to boot the computer. This boot will take longer than usual, because the boot profile is being rebuilt. When the computer has booted up, and all disk activity has stopped (which might take a minute or two after the desktop has appeared), reboot your computer. You should find that bootup is faster. Prelinking A lot of Ubuntu software relies on other pieces of code to work. These are sometimes referred to as libraries, which is a good indicator of their purpose: to provide functions that programs can check in and out whenever they need them, as if they were borrowing books from a library. Whenever a program starts, it must look for these other libraries and load them into memory, so they’re ready for use. This can take some time, particularly with larger and more complicated programs. Because of this, the concept of prelinking was invented. By a series of complicated tricks, the prelink program makes each bit of software you might run aware of the libraries it needs, so that memory can be better allocated.
- 630. 594 CHAPTER 30 ■ OPTIMIZING YOUR S YS TEM Prelinking claims to boost program startup times by up to 50% or more, but the problem is that it’s a hack—a programming trick designed to make your system work in a nonstandard way. Because of this, some programs are incompatible with prelinking. In fact, some might simply refuse to work unless prelinking is deactivated. At the time of this writing, such programs are in the minority. However, keep in mind that prelinking can be easily reversed if necessary. Alternatively, you might want to weigh whether it’s actually worth setting up prelinking in the first place. Configuring Prelinking If you decide to go ahead with prelinking, you’ll need to download the relevant software from the Ubuntu software repositories. Open the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager), click the Search button, and type prelink into the search box. Mark prelink for installation, and then click Apply. Before you can run a prelinking sweep of your system, you need to enable it in one of its configuration files. To do this, type the following in a terminal window: gksu gedit /etc/default/prelink Change the line that reads PRELINKING=unknown to PRELINKING=yes. Then save the file and quit Gedit. To run a prelinking scan of your system, simply issue this command: sudo prelink -a This will prelink practically all the binary files on your system, and may take some time to complete. You may also see some error output, but you don’t need to pay attention to it. Prelinking was automatically added as a daily cron job when you installed it (see Chapter 32 for a description of cron), so any new programs you add will be automatically prelinked. Deactivating Prelinking Should you find prelinking makes a particular application malfunction or simply stop working, you can try undoing prelinking. To do this, find out where the main binary for the program resides, and issue the prelink command with the --undo command option. For example, to remove prelinking from the Gedit text editor program, you could type the following: whereis gedit
- 631. CHAPTER 30 ■ OPTIMIZING Y OUR SYS TEM 595 This command will show that the gedit binary is found at the location /usr/bin/gedit in the file system. Next, attempt to undo prelinking on the binary: sudo prelink --undo /usr/bin/gedit However, this may not work, because some programs might rely on additional binaries on the system. Therefore, the solution might be to undo prelinking for the entire system, which you can do by typing the following: sudo prelink -ua After this, you should remove the prelink package, via the Synaptic Package Manager, to stop it from running again in the future (or manually remove its cron entry, as explained in Chapter 32). OPTIMIZING THE KERNEL You can download the Linux kernel source code and compile your own version of it. This gives you total control over the kernel configuration, so you can leave out parts you don’t want in order to free memory. You can also set certain optimization settings, such as creating a version of the kernel specifically built for your model of CPU. Although compiling a kernel is a simple procedure, there are many complex questions that you’ll need to answer, and an in-depth knowledge of the way Linux works is necessary. In addition, compiling your own kernel brings with it several issues. The first is that it may not work with any binary modules that you have installed, such as graphics cards or wireless drivers. You can opt to update these yourself, but this adds to the complexity. The second problem is that Ubuntu is built around precompiled kernels. Several software packages expect to work with the precompiled kernel, and in addition, Ubuntu may occasionally download an updated prepackaged kernel automatically as part of the system update feature and override the one you’ve created. If there are any security problems with the kernel version you compiled, you’ll need to recompile a new kernel from scratch (or patch the one you have). This means you’ll have to keep an eye on the secu- rity news sites and take action when necessary. That said, compiling a kernel is an excellent way of learning how Linux works, and if it all goes well, the sense of achievement is enormous. Some people choose to download the kernel source code from the official Linux kernel site, www.kernel.org. However, it makes more sense to download the official Ubuntu release, because this will be tailored for the way your system works. Using the Synaptic Package Manager, simply search for linux-source. You can find several guides to compiling your own kernel online, but we recommend the following posting on the Ubuntu forums web site, which looks at compiling a kernel under Ubuntu: https:// help.ubuntu.com/community/Kernel/Compile.
- 632. 596 CHAPTER 30 ■ OPTIMIZING YOUR S YS TEM Freeing Up Disk Space After using Ubuntu for some time, you might find that the disk begins to get full. You can keep an eye on disk usage by using the following command in a terminal window: df -h This will show the free space in terms of megabytes or gigabytes for each partition, also expressed as a percentage figure. If the disk does start to get full, you can take steps to make more space available. Emptying the /tmp Folder An easy way to regain disk space is to empty the /tmp folder. Like its counterpart in the Windows operating system, this is the folder in which temporary data is stored. Some applications clean up after themselves, but others don’t, leaving behind many megabytes of detritus. Because the /tmp folder is accessed practically every second the system is up and running, to empty it safely, it’s necessary to switch to run level 1. This ensures few other programs are running, and avoids the risk of deleting data that is in use. First, switch to the text console by pressing Ctrl+Alt+F1. Then enter these commands to switch to run level 1: sudo killall gdm sudo init 1 A recovery menu will appear. Select the Drop to Root Shell Prompt option. Then enter the following to empty the /tmp folder and reboot: rm -rf /tmp/* reboot ■Tip On a similar theme, don’t forget to empty the desktop Trash. This can hold many megabytes of old data. If you see an error message about permissions when emptying the Trash, you can do so manually from a terminal window. Simply type sudo rm -rf ~/.Trash/* to get the job done.
- 633. CHAPTER 30 ■ OPTIMIZING Y OUR SYS TEM 597 Emptying the Cache of Package Files You might also choose to clear out the Advanced Packaging Tool (APT) cache of old .deb package files. On a system that has been very frequently updated, this can free many megabytes (possibly gigabytes) of space. You can empty the cache by typing the following command in a terminal window: sudo rm -f /var/cache/apt/archives/*.deb ■Caution Be careful to type the command to empty the APT cache exactly as it’s written. Even inserting an additional space can lead to very bad consequences! However, the apt-get clean and apt-get autoclean commands are considered a much safer way to remove unwanted package files. If you want to restore any packages later on, simply locate them in the Synaptic Package Manager list, click the check box, and click Mark for Reinstallation. This will cause the package to be downloaded, installed, and configured. Removing Unused Software If you still need disk space, consider uninstalling unused programs. As you’ve learned, you can manage software through the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager). To remove a package, click its check box and select Mark for Removal. However, it’s not a good idea to simply scroll down the list and remove anything that seems dispensable. Because of the way Linux works, many seemingly insignificant packages are actually vital to the running of the system. Instead, it’s a better idea to look for programs on the Appli- cations menu, and then return to the Synaptic Package Manager to remove them by searching for their names. As always, removing software can create dependency problems, so you might find yourself limited in what software you can actually remove. ■Tip If you want to remove all the desktop games, simply search for gnome-games and gnome-games-data in the Synaptic Package Manager, and mark them for removal.
- 634. 598 CHAPTER 30 ■ OPTIMIZING YOUR S YS TEM Summary In this chapter, we looked at streamlining your installation of Ubuntu. This involved speeding up the boot procedure by running boot scripts in parallel, and decreasing the boot menu delay, along with a handful of other tricks. We also looked at optimizing your hard disk settings to allow for greater speed when loading and saving files. Additionally, we investigated prelinking programs so that they load faster, recompiling the kernel so that it’s optimized for your system, and freeing disk space by various means. In the next chapter, you’ll learn how to perform backups to safeguard your data.
- 635. CHAPTER 31 ■■■ Backing Up Data E very computer user knows that backing up data is vital. This is usually because every computer user has lost data at some point, perhaps because of a corrupted file or acci- dental deletion. Some of the people behind Unix were highly aware of such occurrences, and built in several advanced and useful backup tools. These have been mirrored within Linux, with the result that creating and maintaining backups is easy. In this chapter, we’ll first look at what data should be backed up, and then explore two ways to make backups: using the Simple Backup utility and from the command line. What Data Should You Back Up? Data on your system can be classified into three broad types: program data, configuration data, and personal data. It’s traditionally reasoned that backing up all types of data is inef- ficient, because it would mean backing up practically the entire hard disk. Because of this, you usually want to back up the latter two types of data: configuration and personal. The theory is that if your PC is hit by a hard-disk-wrecking disaster, you can easily reinstall the operating system from the CD or DVD. Restoring your system from backup is then simply a matter of ensuring the configuration files are back in place, so your applications work as you would like them to, and making sure that your personal data is once again made accessible. Practically all the personal configuration data for programs you use every day, as well as your personal data, is stored in your /home directory (although the configuration files for software used system-wide are stored in the /etc directory). If you take a look in your /home directory, you might think that previous sentence is incorrect. On a freshly installed system, the directory appears largely empty. However, most, if not all, of the configuration files are hidden; their directory and filenames are preceded with a period (.), which means that Linux doesn’t display them during a standard directory listing. To view hidden files and folders in the Nautilus file manager, select View ➤ Show Hidden Files. This can be quite an eye-opener when you see the masses of data you didn’t 599
- 636. 600 CHAPTER 31 ■ BA CK ING UP DA TA even realize were there, as shown in the example in Figure 31-1. To view hidden files at the shell prompt, simply use the -a command option with the ls command: ls –a Figure 31-1. Most of the configuration files for programs are hidden—literally—in your /home directory. The configuration files held in your /home directory relate solely to your user account. Any other users will have their own configuration files, entirely independent of yours. In this way, all users can have their own configuration settings for various applications, which can be backed up independently. Under Ubuntu, you can back up both configuration data and personal files using Simple Backup, which can be downloaded from the Ubuntu software repositories.
- 637. CHAPTER 31 ■ BAC KING UP DA TA 601 Keep in mind that there’s little point in making backups if you leave the resultant archive files on your hard disk. For full backup protection, the archives should be stored elsewhere, such as on an external hard disk, network mount, or CD/DVD-ROM. Consider using GNOME’s CD/DVD Creator (click Go ➤ CD/DVD Creator on the menu of any open Nautilus window or Places ➤ CD/DVD Creator from the desktop). Using Simple Backup Simple Backup is a series of programs that enable quick and easy backup and restoration of personal data, as well as system configuration files. Its output, which takes the form of backup directories containing an archive of the files, plus configuration data, can be written to your hard disk (or a network mount attached to it), or to a remote Internet loca- tion, such as an FTP server. Simple Backup was created courtesy of the Google Summer of Code sponsorship scheme and was designed with the help of Ubuntu developers. To install Simple Backup, open Synaptic Package Manager (System ➤ Administration), and then search for sbackup. Click its entry in the list of results, mark it for installation, and click Apply. You’ll then find entries for the backup and restoration components of Simple Backup on the System ➤ Administration menu. ■Note Simple Backup is in the Universe software repository. If you haven’t already set up your online soft- ware repositories, follow the instructions in Chapter 8 to do so. Backing Up Data via Simple Backup To configure a backup, select System ➤ Administration ➤ Simple Backup Config. You’ll see the Backup Properties dialog box, as shown in Figure 31-2. Using this dialog box, you can choose the files that Simple Backup backs up, as well as when it does so. Once you’ve made your changes, click the Save button. This should be done before making a backup. If scheduled backups are set, it’s sufficient to save the changes and quit the program. The backup jobs will take place automatically, in the background, at the set times.
- 638. 602 CHAPTER 31 ■ BA CK ING UP DA TA Figure 31-2. Simple Backup can work automatically or with custom settings you specify. As listed on the General tab of the Backup Properties dialog box, Simple Backup can operate in three different modes: Use recommended backup settings: This is by far the best choice for fuss-free opera- tion. Simple Backup will perform a daily backup of your /home directory, as well as the vital system data held in /etc, /usr/local, and /var. However, it will deliberately exclude any multimedia files (because of their large size), along with any temporary files and files of any type that exceed 100MB (again for size reasons). By default, the backup directory created is placed in /var/backup. Use custom backup settings: This is effectively the same as the recommended backup, and includes the same list of file inclusions and exceptions, but you are able to edit the settings manually. For example, you might choose to include MP3 files, rather than excluding them. The custom backup option lets you alter where the eventual backup directory is saved and the time when the backup is made. Manual backups only: This effectively deactivates Simple Backup, so that it no longer periodically backs up files. However, you can still click the Backup Now! button to manually perform a backup according to the settings on the other Backup Properties dialog box tabs.
- 639. CHAPTER 31 ■ BAC KING UP DA TA 603 ■Note Simple Backup doesn’t create a new backup each time it runs, because that would take too long. The first time it runs, a full backup is taken, but those created afterward are incremental backups, and only files that are new or that have changed are backed up. The backup directory created during the first run is given the file extension .ful, while the backup directories created after this have the extension .inc. As you might expect, if the original .ful backup directory can’t be found, a new full backup will be created. Including Files and Folders in the Backup Job Assuming that you’ve chosen a custom backup, and therefore are able to alter the backup settings, clicking the Include tab in the Backup Properties dialog box allows you to specif- ically define directories and files that you wish to include in the backup. Simply click the Add File or Add Directory button, and then browse to the relevant location (to add a direc- tory, you’ll need to click to open it before clicking the Open button). Bear in mind that adding a directory does so recursively, which means that any direc- tories contained within that directory are also backed up. For this reason, you don’t need to specifically add your /home/<username> directory, because the entire /home directory is included in the backup by default. This means the backup will also include all other users’ directories within /home, too. Excluding Files and Folders from the Backup Job You have a wide range of choices when it comes to excluding files and folders from the list. Directories can be excluded based on their location. Files can be excluded based on loca- tion, type, or size. Clicking the Exclude tab in the Backup Properties dialog box reveals a set of side tabs on the left side of the program window, which allow you to exclude items from the backup as follows: Paths: To exclude a specific file or folder, click this side tab. As with including files, click the Add File or Add Directory button, and then browse to the relevant location. File Types: To exclude certain types of files, click this side tab, as shown in Figure 31-3. After clicking the Add button, you’ll see that you can choose from a brief list of stan- dard file types or filter by file extension (such as mp3 for MP3 files or zip for compressed Zip files). If you want to back up your multimedia files, remove the corresponding file type entries from this list. Regex: If you’re competent at using regular expressions, as outlined in Chapter 15, you can use them to specify extremely precise rules by clicking this side tab. Max size: Any files larger than the stated size on this tab aren’t backed up. By removing the check next to the Do Not Backup line, you can deactivate this feature (although that could lead to massive backup files, which would take a long time to generate).
- 640. 604 CHAPTER 31 ■ BA CK ING UP DA TA Figure 31-3. Excluding certain types of large files will lead to far smaller backup files. Changing the Backup Directory Destination By default, the backup directory created by Simple Backup is stored in the /var/backup directory. By clicking the Destination tab in the Backup Properties dialog box, you can choose to save it in a different location on your hard disk. Of course, if you have a network mount, you can also opt to save it there. In most cases, we advise that you use /var/backup to store the newly created backup files, and copy the files to their permanent destinations later. You might even choose to do this periodically and automatically. By following the instructions in Chapter 32, which explain how to schedule tasks, you could set up a cron job to automatically copy the files to a network mount or removable storage device. ■Note Remember that Simple Backup creates incremental backups, so you should copy all the backup directories and files within /var/backup to the external storage device, rather than just the latest one. You can even transfer the backup directory across the Internet via SSH file transfer or the less secure FTP standard. To do so, simply enter the protocol, username, password, and URL in the following format: sftp://username:password@mysite.com/remotedirectory It’s important to precede the address with the protocol you intend to use: sftp:// for SSH or ftp:// for FTP.
- 641. CHAPTER 31 ■ BAC KING UP DA TA 605 Changing the Time Period Between Backups Clicking the Time tab in the Backup Properties dialog box lets you set the frequency of the backup. You can opt to back up hourly, daily, weekly, or monthly. You can also set the exact time of the backup if necessary. For example, you could set a backup to take place every week on a Tuesday at 12.30 p.m. Simply select the interval period from the Do Backups drop-down list, and then select from the Day of Month, Day of Week, Hour, and Minute lists, as necessary. Simple Backup uses the system scheduler, cron (discussed in more detail in Chapter 32). The use of cron means that Simple Backup doesn’t need to be running all the time for the backup to take place. Simple Backup is started and stopped automatically in the background as needed. You can also elect to perform a full backup after a certain number of days have passed (up to 1,000). A full backup means that Simple Backup creates a new complete backup, rather than incremental ones. Purging Old Backup Files By clicking the Purging tab in the Backup Properties dialog box, you can opt to automati- cally delete old backup directories. This can save on storage space. Purging can be done either by specifying a cutoff date, so that any backup archive older than the specified number of days is deleted, or it can be done logarithmically. This means that the program keeps just one backup out of the many that might be created in a week, month, and so on. All others are deleted. For obvious reasons, you should use the purging option with care! Restoring Data via Simple Backup If the worst happens and you need to restore any number of files from the backup, you can click System ➤ Administration ➤ Simple Backup Restore. The first step is to select the location of the backup directories. If the backups aren’t contained in /var/backup, click Use Custom, and either type the path into the field or click the file browse button and locate the backup directories. Then click the Available Backups drop-down list to choose a backup directory from which to restore. The directory names contain the dates and times the backups were made, and it makes sense to choose the latest (unless you want to revert to an older version). Once the backup has been selected, the files that the backup archive contains will be displayed. Each directory will have a small triangle to its left, which you can click to expand the directory and show its contents. After you’ve found the file(s) or directories you want to restore, highlight them, and then click the Restore button. But beware, because this will rewrite the files and directories to their original locations—files or directories already there with matching filenames will be overwritten! If you want to restore the files to a different location, click the Restore As button, and then choose a folder.
- 642. 606 CHAPTER 31 ■ BA CK ING UP DA TA ■Caution Restored files and directories are owned by root. This is because Simple Backup runs with superuser powers. Therefore, one of the first things you’ll have to do is use the chown command, preceded by sudo, to change the ownership and group of the file to what they were originally. See Chapter 14 for more details about file ownership and how the chown command works. Making Backups from the Command Line Although Simple Backup allows the uninitiated to make quick backups, the tar program is preferred by Linux old-timers. This creates .tar files and is one of the original carry- overs from Unix. tar stands for Tape ARchive and refers to backing up data to a magnetic tape backup device. Although tar files are designed for backup, they’ve also become a standard method of transferring files across the Internet, particularly with regard to source files or other installation programs. A tar file is simply a collection of files bundled into one. By default, the tar file isn’t compressed, although additional software can be used to compress it. tar files aren’t very sophisticated compared to modern archive file formats. They’re not encrypted, for example, but this can also be one of their advantages. ■Note Linux comes with a couple more backup commands, which you might choose to use. They are cpio and pax. Both aim to improve on tar in various ways, but neither is broadly supported at the moment. cpio is installed by default under Ubuntu, and pax can be found via the Synaptic Package Manager. Examine their man pages for more details. Creating tar Files Perhaps unsurprisingly, tar files are created at the console using the tar command. Usually, all that’s needed is to specify a source directory and a filename, which can be done like so: tar -cf mybackup.tar /home/keir/ This will create a backup called mybackup.tar based on the contents of the /home/keir/ directory. The tar command is automatically recursive so, in this example, it will delve into all subdirectories beneath /home/keir. The -c command option tells tar you’re going to create an archive, and the -f option indicates that the filename for the archive will immediately follow. If you don’t use the -f option, tar will send its output to standard output, which means that it will display the contents of the archive on the screen.
- 643. CHAPTER 31 ■ BAC KING UP DA TA 607 If you typed in a command like the preceding example, you would see this message: Removing leading '/' from member names. This means that the folders and files added to the archive will all have the initial forward slash removed from their paths. So, rather than store a file in the archive as this: /home/keir/Mail/file1 the file will be stored as follows: home/keir/Mail/file1 The difference between the two forms concerns us when the files are extracted from the archive. If the files had the initial slash, tar would restore this particular file to /home/ keir/Mail/file1. If there were already a file of that name in that location, it would be overwritten. With the leading slash removed, tar will create a new directory wherever you choose to restore the archive. In this example, it will create a new directory called home, and then a directory called keir within that, and so on. Because of the potential of accidentally overwriting data by specifying absolute paths in this way, a better way of backing up a directory is simply to change into its parent and specify it without a full path: cd /home/ tar -cf mybackup.tar keir When this particular archive is restored, it will simply create a new folder called keir wherever it’s restored. Compressing tar Archives You can also compress the archive from within tar, although it actually calls in outside help from either bzip2 or gzip, depending on which you specify. In theory, bzip2 should achieve a better compression ratio than gzip, but the difference isn’t always significant. To create a tar archive compressed using bzip2, the following should do the trick: tar -cjf mybackup.tar.bz2 keir This will create a compressed backup from the directory keir. The -j command option passes the output from tar to the bzip2 program, although this is done in the background. Notice the change in the backup filename extension to indicate that this is a bzip2 compressed archive.
- 644. 608 CHAPTER 31 ■ BA CK ING UP DA TA The following command will create an archive compressed with the older gzip compression: tar -czf mybackup.tar.gz keir This uses the -z command option to pass the output to gzip. This time, the filename shows it’s a gzip compressed archive, so you can correctly identify it in the future. Extracting Files from a tar Archive Extracting files using tar is as easy as creating them: tar -xf mybackup.tar The -x option tells tar to extract the files from the mybackup.tar archive. Extracting compressed archives is simply a matter of adding the -j or -z option to the -x option: tar -xjf mybackup.tar.bz2 ■Note Technically speaking, tar doesn’t require the preceding hyphen before its command options. However, it’s a good idea to use the hyphen anyway, so you won’t forget to use it with other commands in the future. Viewing tar Archive Information To view the contents of a tar archive without actually restoring the files, use the -t option: tar -tf mybackup.tar |less This example adds a pipe into less at the end, because the listing of files probably will be large and scroll off the screen. Just add the -j or -z option if the tar archive is also compressed. In addition, you can add the -v (for verbose) option to all stages of making, extracting, and viewing an archive to see more information (chiefly the files that are being archived or extracted). Typing -vv provides even more information: tar -cvvf mybackup.tar keir This will create an archive and also show a complete directory listing as the files and folders are added, including permissions.
- 645. CHAPTER 31 ■ BAC KING UP DA TA 609 Saving the File to a CD-R/RW Once the tar file has been created, the problem of where to store it arises. As we mentioned earlier, storing backup data on the same hard disk as the data it was created to back up is foolish, since any problem that might affect the hard disk might also affect the archive. You could end up losing both sets of data! If the archive is less than 700MB, it should be possible to store it on a CD-R or CD-RW. To do this from the command line, first the file must be turned into an ISO image, and then it must be burned. ■Note Remember that the Ubuntu desktop has a very capable CD/DVD burning tool that can save the hassle of working at the command-line prompt. To access it, click Places ➤ CD/DVD Creator. Simply drag the backup file(s) onto the Nautilus window, and then click the Write to Disc button. To turn a backup archive into an ISO image, use the genisoimage command: genisoimage -o backup.iso mybackup.tar.bz2 You can then burn the ISO image to a CD by using the wodim command. Before using this command, you must determine which device name your CD writer uses. Typically, the device name /dev/cdrom is already associated with your CD drive. This name is just a link to the actual location of the drive. You can run Device Manager (see Chapter 8 for more information about Device Manager) and locate your CD writer in the hardware list to find its precise device name. In the example in Figure 31-4, the precise device name of the CD writer is /dev/hdb. Therefore, either /dev/cdrom or /dev/hdb will do the trick, as long as there is only one CD drive in the machine. If you have more than one CD drive, you should use the precise device name to specify the correct CD writer. Specify this device name using the dev= command option. You must also set the speed at which the burn is to take place using the speed= option. This is the writing speed of the drive, which is usually mentioned in the drive’s documentation. Put together, to burn the backup image, enter a command in this format: wodim dev=<device name> speed=<speed of your drive> mybackup.iso On a test system, this took the following form: wodim dev=/dev/hdb speed=24 mybackup.iso You’ll need to eject and then reinsert the newly burned disc before you can examine its contents.
- 646. 610 CHAPTER 31 ■ BA CK ING UP DA TA Figure 31-4. Use the Device Manager to find the precise device name of your CD writer. Saving the File to a DVD If the backup file is larger than 700MB, you might want to burn the backup file to DVD, using a DVD-R/RW drive. You can use the growisofs command for this. You don’t need to create an ISO file for this command, because one is created automatically in the background. Instead, you simply specify the file(s) you want to back up. Apart from this difference, growisofs works along the same lines as wodim, and the following command should do the trick: growisofs -Z /dev/dvd -R -J mybackup.tar.bz2 Typically, the device name for the DVD writer is linked from /dev/dvd. but you can use the Device Manager to get the precise device name. If the DVD disc has any space left, you can simply add your next backup to the disc, alongside the older file. To do this, use the -M command option, instead of -Z: growisofs -M /dev/dvd -R -J mybackup2.tar.bz2 In both cases, you’ll need to eject the DVD and then reinsert it in order to read its contents.
- 647. CHAPTER 31 ■ BAC KING UP DA TA 611 ■Note Remember that you can use the man command to learn about any commands, including those detailed here. In the case of wodim and growisofs in particular, this is worthwhile, because they are very powerful pieces of software. Summary In this chapter, we looked at making backups. First, you saw where in the Linux file system your personal files and other vital data are stored. Then we looked at how the Simple Backup tool can be used to back up system configuration and personal data. You next learned how to use tar, bzip2, and gzip at the command line to back up any kind of data. Finally, you learned how to burn CDs and DVDs of your backup files at the command line. In the next chapter, we’ll look at how tasks can be scheduled to occur at various times under Ubuntu.
- 649. CHAPTER 32 ■■■ Scheduling Tasks I n this book, you’ve learned about various tasks you can perform to keep Ubuntu running smoothly. You may decide that you want some of these tasks to occur on a regular basis. For example, perhaps you want your /home folder to be backed up every day, or perhaps you want to clean the /tmp folder to ensure that you always have enough free disk space. You could carry out each task individually, but human nature would no doubt step in, and you would forget, or you might perform the action twice, because you’ve forgotten that you’ve already done it. As you might expect, Linux is able to automate the running of particular tasks. They can be run either periodically or as one-time tasks. Using Linux’s scheduling features is explained in this chapter. Scheduling with cron Under Linux, the traditional way of scheduling tasks is via the cron daemon. This works on behalf of the user to automate individual jobs and is also used by the system to run its own maintenance tasks. The cron command is useful for scheduling heavy loads at a time when you know the system will be underused. For cron to run system tasks, it reads a file called /etc/crontab. Traditional cron starts soon after bootup and sits in the background while you work, checking every minute to see if a task is due. As soon as one comes up, it commences the task, and then returns to a waiting status. Creating a Scheduled Task Users have their own crontab file, which is stored in the /var/spool/cron/crontabs/ directory, by username. This directory is owned by root, and normal users can’t view each other’s crontab. The user’s crontab file is updated in a text editor, but a special command is used to do so. (It saves you from having to remember to run the crontab command after editing the file.) 613
- 650. 614 CHAPTER 32 ■ S CHEDULING TA SK S Adding a scheduled task is done via a terminal window (Applications ➤ Accessories ➤ Terminal). Entering the following command will cause your personal crontab file to be loaded into the GNU nano text editor, ready for editing: crontab -e If this is the first time you’ve edited your crontab file, you’ll see a comment line at the top. Comments in configuration files are nearly always preceded by hash symbols (#); the hash tells Ubuntu to ignore that line. This particular comment outlines the syntax for adding an entry to the file. You can delete the comment line if you want. Adding a new entry is relatively easy, and normally takes this form: 01 12 15 * * tar -cjf /home/keir/mybackup.tar.bz2 /home/keir Let’s examine the line piece by piece. The first part—the numbers and asterisks—refers to when the task should be run. From left to right, the fields refer to the following: • Minutes, from 0 to 59 • Hours, in 24-hour time, so from 0 to 23 • Day of the month, from 1 to 31 (assuming the month has that many days) • Months, from 1 to 12 • Day of the week, either from 0 to 6 (0 is Sunday), or specified as a three-letter abbre- viation (mon, tue, wed, and so on) In the example, the task is set to run at the first minute at the twelfth hour (midday) on the fifteenth day of the month. But what do the asterisks stand for? They’re wildcards, and tell cron that every possible value applies. Because an asterisk appears in the month field, this task will be run every month. As an asterisk appears in the day field, too, the task could run on any day of the week. You might have noticed a logical contradiction here. How can you specify a day if you also specify a date in the month? Wouldn’t this seriously limit the chances of the task ever running? Yes, it would. If you were to specify sat, for example, and put 15 in the date field, the task would run on only the fifteenth of the month if that happened to be a Saturday. This is why the two fields are rarely used in the same crontab entry, and an asterisk appears in one if the other is being used. After the time and date fields comes the command itself: tar. As you learned in the previous chapter, this tar command can be used to back up your personal data (in this example, as long as your username is keir).
- 651. C HA PTER 32 ■ SC HEDULING TAS KS 615 The cron daemon isn’t clever enough to interpret symbols such as the tilde (~) as a way of referring to your /home directory. For this reason, it’s best to be very thorough when defining a cron job, and always use absolute paths. Let’s take a look at another example (shown in Figure 32-1): 50 23 * * 0-3 tar -cjf /home/keir/mybackup.tar.bz2 /home/keir Figure 32-1. Editing crontab lets you schedule tasks using the nano text editor. The first field says that this task will run at the fiftieth minute of the twenty-third hour (that is, ten minutes before midnight). The day and month fields have asterisks, so this implies that the task could run on any day and every month. However, the day field contains 0-3. This says that the task should run only on days 0 through to 3, or Sunday through Wednesday. You can have as many cron entries as you like; simply give each a separate line. You don’t need to put them in date or time order. You can just add them as and when you see fit. When you’re finished, save the file with Ctrl+O and quit GNU nano by pressing Ctrl+X. You’ll be prompted to save the file to the /tmp directory, which is fine. The cron file will be copied into the correct location as soon as nano quits, and you should see the following output in the terminal: crontab: installing new crontab
- 652. 616 CHAPTER 32 ■ S CHEDULING TA SK S Scheduling with anacron If cron has an Achilles’ heel, it is that it expects your computer to be up and running all the time. If you schedule a task for around midnight, as in one of the previous examples, and your computer isn’t switched on at that time, the task simply won’t run. anacron was created to fix this problem (see Figure 32-2). It also can run scheduled tasks, but unlike cron, it doesn’t rely on exact times or dates. Instead, it works on the prin- ciple of time periods. For example, tasks can be set to run every day. In fact, tasks can be set to run every x number of days, regardless of whether that’s every two days or every hundred thousand. It also doesn’t matter if the computer is shut down and rebooted during that time; the task will be run only once in the specified time period. In addition, tasks can be specifically set to run at the beginning of each month, regardless of the length in days of each month. Figure 32-2. anacron is used to run tasks periodically, such as every couple of days. anacron is primarily designed to be used for system maintenance, and the /etc/ anacrontab file holds the details of the tasks. Unlike with crontab, each user doesn’t have his own anacrontab file. However, there’s no reason why you can’t add your own commands to the main anacrontab file. This file can be modified in any text editor, and you don’t need to use a special command (as with crontab), although you’ll need to adopt superuser (root) powers.
- 653. C HA PTER 32 ■ SC HEDULING TAS KS 617 ■Note The /etc/anacrontab file runs scripts contained in the directories /etc/cron.daily, /etc/ cron.weekly, and so on, depending on when the tasks are meant to run (every day, week, or month). The average user never needs to bother with system-wide anacron jobs. Programs create their own entries as and when necessary. Each line in anacrontab takes the following form: days delay name of task command The days field holds the number of days in between the running of the task. To set the task to run every day, you would enter 1. To make the task run every nine days, you would add 9. To set it to run monthly, you would type @monthly. The delay field tells anacron how long to wait before running the task, specified in minutes. It is necessary because anacron is run at boot time by default. If it were to run all the sched- uled tasks simultaneously, the machine could grind to a halt under the load. A delay of five minutes is usually adequate, although if some tasks are already scheduled to run on the same day before that task, you should allow enough time for them to finish. The name of task field is for your personal reference and shouldn’t contain either slashes or spaces (hint: separate words using underscores or periods). The command field is, as with crontab, the shell command that should be run. ■Note anacron is run as the root user, so if you do add your own entry to anacrontab, any files it creates will be owned by root, too. If you use anacron to create a backup of your /home directory, for example, the resultant backup file will be owned by root, and you’ll need to use the chown command to change its owner- ship so you can access it. See Chapter 14 for more information about the chown command. Let’s look at an example of an anacrontab entry: 1 15 backup_job tar -cjf /home/keir/mybackup.tar.bz2 /home/keir This will run the specified tar command every day (because 1 is in the days field), and with a delay of 15 minutes after anacron is first run. anacron is run automatically every time you boot, but you can also run it manually by simply typing it at the command prompt (with superuser powers): sudo anacron
- 654. 618 CHAPTER 32 ■ S CHEDULING TA SK S Using at to Schedule One-Off Tasks What if you quickly want to schedule a one-time-only task? For this, you can use the at command. Adding a job with at is very easy, largely because the at command accepts a wide variety of time formats. For example, typing the following at the command prompt will run a job at lunchtime tomorrow: at noon tomorrow It really is as simple as that! Alternatively, you can specify a time, date, and even a year: at 13:00 jun 25 2009 This will run the job at 1 p.m. on June 25, 2009. The various time and date formats are explained in the at command’s man page. Once the at command containing the date has been entered, you’ll be presented with a mock shell prompt. Here, you can type the commands you want to run. Many shell commands can be entered, one after the other; just press Enter between them. Then press Ctrl+D to signal that you’re finished editing. At this point, at will confirm the time and write the task into its list. You can view the list at any time by typing atq. This will show a list of numbered jobs. You can remove any job by typing atrm, followed by its atq job number. For example, the following will remove the job numbered 9 in the atq list: atrm 9 Summary In this brief chapter, we looked at how you can schedule tasks under Ubuntu, which essen- tially means making programs run at certain times. We examined the cron and anacron daemons, which can schedule tasks to run at specific times or periodically, and we also examined the at command, which can schedule one-off tasks. In the final chapter of this book, we will look at how you can access your Ubuntu computer remotely—theoretically, from any Internet-equipped location in the world.
- 655. CHAPTER 33 ■■■ Accessing Computers Remotely O ne area where Linux particularly excels is in its support for networking, including the Internet. If you wish to learn about how networks operate on a fundamental level, then Linux is an ideal choice, because it puts you in direct contact with the technology. The widespread integration and support for networking extends to several useful system tools, which let you access Linux across any kind of network, including the Internet. In fact, it’s even possible to access a Linux machine running on a different continent, just as if you were sitting in front of it! This chapter looks at the many ways you can access your Ubuntu computer remotely. In addition, we look at the ways that you can use Ubuntu to access almost any other computer, including Windows PCs. Using Secure Shell The history of Unix has always featured computers connecting to other computers in some fashion, whether they were dumb terminals connecting to a mainframe computer, or Unix machines acting as nodes on the fledgling Internet. Because of this, a wide variety of techniques and protocols were invented to allow computers to communicate and log in to each other across networks. However, while these still work fine over the modern Internet, we’re now faced with threats to the privacy of data. In theory, any data transmitted across the Internet can be picked up by individuals at certain key stages along the route. If the data isn’t protected in any way, it can be easily intercepted and read. To counter such an occurrence, the ssh suite of programs was created. Although these programs started as open source, they gradually became proprietary. Therefore, several newer open-source versions were created, including the one used on the majority of Linux distributions (including Ubuntu): OpenSSH. The goal of ssh is to create a secure connection between two computers. You can then do just about any task, including initiating a shell session so you can use the remote computer as if you were sitting in front of it, or copying files to and from the remote machine. ssh uses various techniques at both ends of the connection to encrypt not only the data passing between the two machines, but also the username and password. 619
- 656. 620 C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY ■Note This chapter refers to remote and local machines. The remote machine is the computer you’re connecting to across the network or Internet. The local machine is the one you’re actually sitting in front of. These two terms are widely used within documentation describing networking. Logging In to a Remote Computer The most basic type of ssh connection is a remote login. This will give you a command prompt on the remote computer, as if you had just sat down in front of it and logged in to a text console. But before you can log in to any machine via ssh, you’ll need to be sure the remote computer is able to accept ssh connections. This means that it needs to be running the ssh server program (referred to as a service or daemon), and also that its firewall has an open port for incoming connections. The two major components of OpenSSH are the client and server. Some distributions install both packages and run the server component all the time. However, only the client component of SSH is installed under Ubuntu by default. To install the server component, and therefore access your Ubuntu system remotely, you’ll need to open the Synaptic Package Manager (System ➤ Administration ➤ Synaptic Package Manager) and search for openssh-server. Click to install it. Configuration will be automatic, although if you’re using the Ubuntu firewall (see Chapter 9), you will need to configure an incoming rule to open port 22, the standard port for SSH connections. ■Tip If you use Firestarter, as described in Chapter 9, you can simply select the default incoming SSH rule. There’s no need to manually specify a port number. Initiating an ssh session with a remote machine is usually achieved by typing some- thing similar to the following at a command prompt on the local machine: ssh <username>@<IP address> In other words, you specify the username you want to log in as, as well as the IP address of the remote machine. If there’s a fully qualified domain name (FQDN) for the system you want to access, you could specify that instead of the IP address.
- 657. C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY 621 ■Note An FQDN is the hostname of a system plus its Internet address, such as mycomputer.example.com. Unless you have had this function specifically set up for you by a system administrator, you’ll probably have to connect via its IP address. However, if you rent a web server, you might be able to ssh into it using the domain name of the server. You’ll be prompted for your password which, obviously, is the password for the account you’re trying to log in to on the remote computer. When you log in for the first time, you’ll see the following message: The authenticity of the host <host IP address> can't be established Figure 33-1 shows an example. This means that the remote computer’s encryption key hasn’t yet been added to your PC’s store file. However, once you agree to the initial login, the encryption key will be added, and it will be used in the future to confirm that the remote computer you’re connecting to is authentic. Figure 33-1. When logging in via ssh for the first time, you’ll need to confirm acceptance of the encryption key.
- 658. 622 C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY ■Note There’s a fine line between security concern and paranoia. Connecting to a remote machine for the first time and accepting its ssh key is considered insecure by some people, because you cannot be 100% sure that the remote machine is the one you want to connect to. It might have been swapped for a different machine by crackers. In addition, the key might be intercepted on its journey to you. Because of this, those who are highly security conscious can use the ssh-keygen program or Seahorse (see Chapter 9) to create a key on the remote machine first, and then import it to the local machine before logging in. See the ssh-keygen man page for more details. After confirming that you want to make the connection, you’ll be invited to enter the password for the user account under which you initiated the ssh connection. Once this is done, you should find yourself with a shell login on the remote computer. You can run the same commands as usual and perform identical tasks. The machine you’re logged in to will show no symptoms of being used remotely. This isn’t like the movies, where what you type on your local machine is somehow mirrored on the remote machine for all to see. However, obviously, if a user of the remote machine were to view her network connections using something similar to the netstat command, then she would see another computer attached via ssh. To end an ssh session, simply type exit. This will return you to the command prompt on your own machine. ■Tip There’s a version of the ssh client that runs on a variety of non-Linux operating systems, making it possible to log in to your Ubuntu machine from a Windows computer. The program is called PuTTY and can be downloaded from www.chiark.greenend.org.uk/~sgtatham/putty/ and many mirrors of this site around the world. MANAGING REMOTE SESSIONS Whenever you open any kind of shell to enter commands and run programs, you might have noticed that any commands you start running last only as long as the shell window is open. When the shell window is closed, any task running within it ends, too. This is because the shell is seen as the “owner” of the process, and when the owner dies, any processes it started also dies. When using ssh to start a remote shell session, this also applies. Whenever you log out, any tasks you were running are ended. This can be annoying if, for example, you’ve started a lengthy download on the remote machine. Effectively, you must remain logged in via ssh until the download has finished. To get around this, you can use the handy screen program. This isn’t specifically designed to be an aid to remote logins, but there’s no reason why it cannot be used in such a situation.
- 659. C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY 623 The screen program effectively starts shell sessions that stick around, even if the shell window is closed or the ssh connection is ended or lost. After logging in to the remote computer via ssh, you can start a screen session by simply typing the program name at the prompt: screen. After pressing the spacebar as prompted to start the program, there won’t be any indication that you’re running a screen session. There’s no taskbar at the bottom of the terminal window, for example. screen works completely in the background. Let’s consider what happens when you detach and then reattach to a screen session. To detach from the screen session, press Ctrl+A and then Ctrl+D. You’ll then be returned to the standard shell and, in fact, you could now disconnect from your ssh session as usual. However, the screen session will still be running in the background on the remote computer. To prove this, you could log back in, and then type this: screen -r. This will resume your screen session, and you should be able to pick up quite literally where you left off; any output from previous commands will be displayed. To quit a screen session, you can either type exit from within it or press Ctrl+A and then Ctrl+ (backslash). The screen program is very powerful. To learn more about it, read its man page. To see a list of its keyboard commands, press Ctrl+A, and then type a question mark (?) while screen is running. Transferring Files Between Remote Computers The ssh utility brings with it two basic ways of transferring files between machines: scp and sftp. scp is fine for smaller file transfers, but if you want to copy a lot of files, sftp is probably a better choice. Using scp Strictly speaking, scp is merely a program that copies files from one computer to another in a secure fashion using the underlying ssh protocol. You don’t have to be logged in to another computer via ssh to use it. For example, if you were merely browsing your own computer and wanted to transfer a file to a remote computer, you could type the scp command in the following form: scp myfile <username>@<IP address>:/home/username/ The IP address is the IP address of the computer to which you want to send the file. In other words, you must first specify the local file you want to copy across, and then provide the login details for the remote computer in the same format as with an ssh login. Then, after a colon, you specify the path on the remote computer where you would like the file to be copied. ■Note If it helps, consider the latter part of the scp command after the filename as one large address: first you provide your username, then the computer address, and then the path.
- 660. 624 C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY Using the command when you are logged in to another computer via ssh works in exactly the same way. Let’s consider an example. Assume there are two computers: A and B. You have a user account on each one. So sitting at the keyboard of A, you establish an ssh connection with B by typing the following: ssh <username>@computer_B This lets you log in to B as if you were sitting in front of it. You spot a file called spreadsheet.xls that you want to copy to your local machine (A). You therefore issue the following command: scp spreadsheet.xls <username>@computer_A:/home/username/ This will copy the file from computer B to computer A and place it in the /home/ username/ directory. ■Tip With scp, you can copy entire directories, too. Simply add the -r command option, like so: scp -r mydirectory <username>@<IP address>:/path/. Using sftp To copy a lot of files to or from a remote computer, the sftp program is the best solution. If you’ve ever used a shell-based FTP program, you’ll feel right at home, because sftp isn’t very different. You can initiate a sftp session by using this command format: sftp <username>@<IP address> The same rules as when you’re logging in with ssh apply, both in terms of formatting the login command and also confirming the encryption key if this is the first time you’ve logged in. The sftp commands are fairly basic. For example, to copy a file from the remote machine, simply type this: get <filename> This will copy the file into the directory you were in on the local machine before you started the sftp session. By specifying a path after the filename, the file will be copied to the specified local directory, as in this example: get spreadsheet.xls /home/keir/downloaded_files/
- 661. C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY 625 Sending files from the local machine to the remote machine is just as easy: put <filename> By specifying a path after the filename, you can ensure the file is saved to a particular remote path. One useful thing to remember is that any command preceded by an exclamation point (!, called a bang in Linux-speak) is executed on the local machine as a shell command. So, if you wanted to remove a file on the local machine, you could type this: !rm -rf <filename> Simply typing a bang symbol on its own starts a shell session on the local machine, so you can perform even more tasks. When you’re finished, type exit to return to the sftp program. For a list of popular sftp commands, see Table 33-1. Table 33-1. Common sftp Commands Command Function cd Change the remote directory lcd Change the local directory get Download the specified file ls List the remote directory lls List the local directory mkdir Create a directory on the remote machine lmkdir Create a directory on the local machine put Upload the specified file to the remote machine pwd Print the current remote directory rmdir Delete the remote directory rm Delete the remote file exit Quit sftp !command Execute the specified command on the local machine ! Start a temporary local shell session (type exit to return to sftp) help Show a list of commands
- 662. 626 C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY Accessing GUI Applications Remotely So far, we’ve looked at connecting to a remote machine using command-line tools. But Ubuntu is based around the graphical desktop, so is there any way of running, say, a Nautilus file browser window so you can manipulate files on the remote machine? Yes! The graphical subsystem of Linux, X, is designed to work across a network. In fact, if you run Linux on your desktop PC, X still works via a loopback network within your machine (meaning that network commands are sent out but addressed to the very same machine on which they originated). Because of this, it’s possible to make programs on a remote machine run on a local machine’s X server. The actual work of running the application is handled by the remote machine, but the work of displaying the graphics is handled by the local machine. ■Caution X connections across a network can be a little slow and certainly not as snappy as running the same application on the local machine. This lag can become irritating after a while. Running X Applications on a Remote Computer Unfortunately, X server communications aren’t normally encrypted, so if one machine were to simply connect to an X server over a network (or even the Internet), the data transfer would be unencrypted and open to eavesdroppers. But ssh once again comes to the rescue. You can configure ssh so that X applications on the remote computer can be run on the local machine, with the data sent through the ssh connection. Log in to the remote machine using ssh, but also specify the -X flag: ssh –X <username>@<IP address> When you’re logged in, you can simply start any application by typing its name as usual. The only difference is that the program will appear on the screen of the local machine, rather than on the remote machine, as shown in Figure 33-2. Using X across the Internet or even a local network isn’t very fast, and you can expect delays when you open menus or if the screen must frequently redraw. However, it can prove very useful.
- 663. C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY 627 Figure 33-2. Although the Calculator application appears on the local computer’s display, it’s actually running on the remote machine. Accessing Ubuntu via Remote Desktop A less secure but more convenient way to access your Ubuntu PC’s desktop applications across a network is to use Ubuntu’s Remote Desktop feature. The advantage of this method is that the entire desktop of the remote computer appears in a window on the local computer’s desktop. Remote Desktop uses the Virtual Network Computing (VNC) software to share the desktop. Sharing is the key word because, effectively, anyone who connects will take control of the main desktop. They will control the mouse and keyboard input. However, there are a couple of important differences compared to accessing X across an ssh connection: • Although the password is sent encrypted, the rest of the VNC data transfers aren’t. Complete encryption is possible using special versions of VNC, or via an OpenSSH tunnel, but this can be difficult to set up on the Windows end of the connection. • The remote desktop isn’t blanked, so anyone standing in front of the computer will be able to see what you’re doing. This could present a security/privacy risk.
- 664. 628 C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY If you’re prepared to put up with these caveats, then allowing Remote Desktop access on a computer is easy. Here’s the procedure: 1. Click System ➤ Preferences and then click Remote Desktop. In the Sharing section of the dialog box, put a check alongside Allow Other Users to View Your Desktop and ensure there’s a check in the box alongside Allow Other Users to Control Your Desktop, as shown in Figure 33-3. In the Security section, you can choose whether the user can confirm each connection and whether you want to set a password. Both options add to the security of your system, although the confirmation option will mean that someone will have to be at the computer to authorize an incoming connection. Figure 33-3. Ubuntu’s Remote Desktop feature lets you share your desktop but isn’t as secure as making an X server connection across SSH. ■Note Ignore the information in the dialog box about how users can view your desktop. Instead, you should find out your computer’s IP address and use that. 2. On the computer from which you want to connect to the remote desktop, click Applications ➤ Internet ➤ Remote Desktop Viewer. Click the Connect button. In the Host field, enter the IP address of the computer you wish to connect to. Then click Connect. 3. You’ll be prompted to enter the password, if one is applicable, and you should then see the remote computer’s desktop in a window.
- 665. C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY 629 After you’ve finished with the Remote Desktop session, press Ctrl+Alt to release the cursor and simply close the window’s tab, or click the Close button to terminate the connection. Connecting to Remote Windows Computers The Terminal Server Client program (Applications ➤ Internet ➤ Terminal Server Client) allows you to connect to a variety of remote desktop server programs and, in particular, Windows Vista, XP, or 2000 computers via the Remote Desktop Protocol (RDP). Unfortu- nately, Windows XP Home and earlier versions of Windows don’t support RDP connections, which means that they aren’t able to run an RDP server and allow other computers to access their desktops. However, there is a way to access the desktop of these computers remotely using some add-in software. Connecting to Windows Vista Before initiating the connection, you should ensure the Windows Vista computer is set for incoming remote connections, if you haven’t already. First, make sure that your Vista account has a password—Terminal Server Client won’t be able to connect otherwise. Next, ensure that Vista’s remote desktop feature is activated. Click the Start button, right- click Computer, and click Properties. In the window that appears, click the Remote Settings link on the left side. In the dialog box that appears, click Allow Connections from Computers Running Any Version of Remote Desktop (Less Secure), and then click Apply. ■Note These instructions assume that you intend to connect using a Windows Vista administrator user- name and password. If not, you’ll need to click the Select Users button and add the user accounts you wish to use. Back on the Ubuntu computer, click Applications ➤ Internet ➤ Terminal Server Client. Once the program is running, in the Computer field, type either the IP address of the machine or its fully qualified domain name (FQDN). You don’t need to type the user- name, password, or any other details. Click Connect, and a new window should appear, in which you should see a login prompt. You should then log in to Windows using your username and password.
- 666. 630 C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY Connecting to Windows XP Professional, 2000, and NT Here, we use an XP Professional machine as an example, but the instructions are also valid for Windows 2000 and NT. First, make sure the Windows XP computer is configured to allow incoming RDP connections. To configure it, right-click My Computer and select Properties. In the System Properties dialog box, click the Remote tab, and make sure Allow Users to Connect Remotely to This Computer is checked, as shown in Figure 33-4. The Windows computer to which you want to connect may also need to be updated with the latest service packs, particu- larly in the case of a Windows 2000 computer. Figure 33-4. You need to enable the option under Remote Desktop to access Windows XP Professional machines using RDP and the Terminal Server Client program. To connect, use the Terminal Server Client program, which is on the Applications ➤ Internet menu. Once it’s running, in the Computer field, type either the IP address of the machine or its FQDN (if applicable). You don’t need to type the username, password, or any other details. Click Connect, and a new window should appear, in which you should see an XP login prompt. You should then log in to Windows using your username and password.
- 667. C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY 631 ■Caution If you haven’t set a password for your user account on the Windows machine, you won’t be able to log in. This is a quirk of the Windows XP RDP system. The solution is simple: use the User Accounts applet within the Windows Control Panel to assign yourself a password. Connecting to Other Computers You can download a VNC server for just about any operating system. Windows and Linux are supported, as is Mac OS X. In fact, a VNC server will run on any Windows computer, from 95 upward. Once it’s installed, you can then use the Terminal Server Client program within Ubuntu to connect to that computer’s remote desktop. ■Note Any computer that’s running the VNC Viewer program can access a computer running a VNC server (including the one set up by Ubuntu’s Remote Desktop feature). Various VNC Viewer programs are available for Linux, Windows, Mac OS X, and other operating systems, including the likes of PocketPC. Just search the Web using “VNC Viewer” as a search string to find viewer programs. Of course, you’ll have the same insecurities and lack of desktop blanking that plague VNC connections to a Ubuntu desktop, as described previously. But if you’re prepared to accept this, you’ll be pleased to hear that setting up the VNC server on the Windows machine is easy. TightVNC, available from www.tightvnc.com, is one of the best variations of VNC around. You should download the self-installing package for Windows. During installation, you’ll be asked if you want to register TightVNC as a system service. Click the check box alongside this option. This will activate the VNC server every time the computer starts. Once the program is installed, the server configuration program will appear. You should change the password by overtyping the default in the Password field. Connecting to the remote Windows machine is also a piece of cake. On the Ubuntu system, open Remote Desktop Viewer (Applications ➤ Internet ➤ Remote Desktop Viewer) and click the Connect button. Type the remote computer’s IP address into the Host field, and then click Connect. There’s no need to fill in any of the other details. You’ll be prompted for the remote computer’s VNC server password and, once you enter this, the remote desktop will appear in a window. Figure 33-5 shows an example of connecting to a Windows 98 computer.
- 668. 632 C H A P T E R 3 3 ■ ACCESSING COMPUTERS REMOTELY Figure 33-5. By installing a VNC server, you can connect to just about any remote operating system, including Windows 98 (as here). Summary In this chapter, we looked at how you can access your Ubuntu computer remotely across the Internet. We examined how you can access the computer as if you were sitting in front of it, using the ssh program. This allows you to start a command-line prompt and even run GUI programs from the remote computer. In addition, we discussed how the screen program can be used to keep sessions alive across various logins, and how you can transfer files using the sftp and scp programs. Then we looked at how to use the Remote Desktop Viewer and Terminal Server Client tools to access the desktop of remote Windows computers.
- 671. APPENDIX A ■■■ Glossary of Linux Terms T his appendix provides brief explanations of common terms used in the Linux and Unix environments. These include technical terms, as well as conventions used within the Linux community. Because of space limitations, this glossary is somewhat selective, but still should prove a lasting reference as well as a helpful guide for those new to Linux. Cross-referenced terms are highlighted in italics. Symbols . Symbol that, in the context of file management, refers to the current directory. .. Symbol that, in the context of file management, refers to the parent directory of that currently being browsed. / Symbol that, in the context of file management, refers to the root of the file system; also separates directories in a path listing. ~ Symbol that, in the context of file management, refers to a user’s home directory. | Pipe symbol; used at the command prompt to pipe output from one command to another. > Symbol that, when used at the command prompt, indicates output should redirect into a file. 635
- 672. 636 APPENDIX A ■ GLOS SA RY OF LINUX TERM S < Symbol that, when used at the command prompt, indicates a command should accept input from a file (see redirect). # Symbol that, when it appears on the command prompt, usually indicates the user is currently logged in as root. $ Symbol that, when it appears on the command prompt, usually indicates the user is currently logged in as an ordinary user. (Note that some versions of Linux/Unix use % or > instead of $.) ? Wildcard character indicating that any character can be substituted in its place. * Wildcard character indicating that zero or more characters can appear in its place. *nix Popular but unofficial way of describing the family tree that comprises Unix and its various clones, such as Linux and Minix. A administrator Another word for either the root user or one who has adopted that user’s powers temporarily. AIX IBM’s proprietary form of Unix that runs on the company’s proprietary hardware, as well as commodity hardware based around AMD and Intel processors. Nowadays, IBM is slowly deprecating AIX in favor of Linux. alias Method of creating a user-defined command that, when typed, causes another command to be run or a string to be expanded. Apache Popular Open Source web server software that runs on Unix, Linux, and other operating system platforms. Considered responsible in part for the rise in popularity of Linux in the late 1990s.
- 673. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 637 applet Small program that, in the context of the Ubuntu desktop, runs as part of a larger program and offers functions that complement the main program. The GNOME desktop incorporates several applets in its notification area. APT Advanced Packaging Tool; the underlying system by which software is managed and installed on Ubuntu and Debian Linux systems. Shell commands beginning with apt, such as apt-get, are used to install new software from various repositories. Under Ubuntu, the Synaptic Package Manager program provides a GUI method of using APT. archive Any file containing a collection of smaller files, compressed or otherwise (see also tar). B BASH Bourne Again SHell. The most common shell interpreter used under Linux and offered as default on many Linux systems. binary executable Another way of referring to a program that has been compiled so that it can be used day-to-day. See also compile. block device How the Linux kernel communicates with a device that sends and receives blocks of data; usually a hard disk or removable storage device. See also character device. BSD Unix Berkeley Software Distribution Unix; form of Unix partially based on the original Unix source code but also incorporating recent developments. BSD is open source and free for all to use and share with practically no restrictions. There are various forms of BSD Unix, such as FreeBSD, NetBSD, and OpenBSD. BSD doesn’t use the Linux kernel, but it runs many of the same programs. Some of the programs offered within the Linux operating system come from BSD. bzip2 Form of file compression. Together with the older and less efficient gzip, it is a popular form of file compression under Linux and the equivalent to Zip compression under Windows. Files employing bzip compression are usually given a .bz2 file extension. See also tar.
- 674. 638 APPENDIX A ■ GLOS SA RY OF LINUX TERM S C C Programming language in which much of the Linux kernel is written, as were later versions of Unix before it. C was created by some of the same people who created Unix, and its devel- opment mirrors that of Unix. C++ Object-oriented programming language; originally designed to be an enhancement to C, but now seen as a popular alternative. C# Modern programming language, which uses similar syntax to C, created by Microsoft and re-created on Linux via the Mono project. character device How Linux refers to a device that sends/receives data asynchronously. For various technical reasons, this typically refers to the terminal display. See also block device. checksum Mathematical process that can be applied to a file or other data to create a unique number relative to the contents of that file. If the file is modified, the checksum will change, usually indicating that the file in question has failed to download correctly or has been modified in some way. The most common type of checksum program used under Linux is md5sum. client Shorthand referring to a computer that connects to a server. closed source The reverse of Open Source in which the source code is not available for others to see, share, or modify. See also proprietary. code See source code. command Input typed at the shell that performs a specific task, usually related to administration of the system and/or the manipulation of files.
- 675. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 639 command-line prompt See shell. commodity In the context of hardware, describes PC hardware usually based around Intel or AMD processors that can be bought off the shelf and used to create sophisticated computer systems (as opposed to buying specially designed hardware). One reason for Linux’s success is its ability to use commodity hardware. community The general term for the millions of Linux users worldwide, regardless of what they use Linux for or their individual backgrounds. By using Linux, you automatically become part of the community. compile The practice of creating a binary file from source code, usually achieved using the ./configure, make, make install series of commands and scripts. config file Configuration file; any file that contains the list of settings for a program. Sometimes it’s necessary to edit config files by hand using programs like vi or Emacs, but often the program itself will write its config file according to the settings you choose. copyleft The legal principle of protecting the right to share a creative work, such as a computer program, using a legally binding license. Copyleft also ensures future iterations of the work are covered in the same way. cracker Someone who breaks into computer systems to steal data or cause damage. The term is not necessarily linked to Linux or Unix but was created by the community to combat the wide- spread use of hacker in this sense. The word hacker has traditionally defined someone who merely administers, programs, and generally enjoys computers. cron Background service that schedules tasks to occur at certain times. It relies on the crontab file. CUPS Common Unix Printing System; set of programs that work in the background to handle printing under Unix and Linux.
- 676. 640 APPENDIX A ■ GLOS SA RY OF LINUX TERM S curses Library that lets software present a semigraphical interface at the shell, complete with menu systems and simple mouse control (if configured). The version of curses used under Linux and Unix is called ncurses. CVS Concurrent Versioning System; application that allows the latest version of software packages to be distributed over the Internet to developers and other interested parties. D daemon See service. Debian Voluntary organization that produces distributions of Free Software operating systems, including Linux. Because it is a nonprofit organization run by passionate Free Software advocates, it is considered the most ethically sound of all Linux outfits. Many distributions, including Ubuntu, use Debian as the basis for their software because of its claimed reliability and relative simplicity. dependency A way of referring to system files that a program requires in order to run. If the dependencies are not present during program installation, a program might refuse to install. device Linux shorthand describing something on your system that provides a function for the user or that the system requires in order to run. This usually refers to hardware, but it can also describe a virtual device that is created to provide access to a particular Linux function. directory What Windows refers to as a folder; areas on a hard disk in which files can be stored and organized. distribution A collection of software making up the Linux operating system; also known as a distro. The software is usually compiled by either a company or organization. A distribution is designed to be easy to install, administer, and use by virtue of it being an integrated whole. Examples include Ubuntu, SUSE Linux, Red Hat, and Debian.
- 677. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 641 distro Shorthand for distribution. documentation Another way of describing written guides or instructions; can refer to online sources of help as well as actual printed documentation. dpkg Shell command that can be used to administer software under Ubuntu and Debian. However, the APT system, which uses dpkg, is the preferred method of installing software. E Emacs Seminal text editor and pseudo-shell beloved by Unix aficionados; can be used for program- ming tasks, simple word processing, and much more. This editor has cultural significance as one of the core pieces of software offered by GNU Project, The. Emacs was originally developed principally by Stallman, Richard. See also vi. environment Shorthand referring to a user’s unique Linux configuration, such as variables that tell the shell where programs are located. F FAT32 File Allocation Table 32-bits; file system offered by Windows 98, Me, 2000, and XP. Linux can both read and write to FAT32 file systems. See also NTFS and VFAT. Firefox Web browser program used under Ubuntu and produced by the Mozilla Foundation. FLOSS Free, Libre, or Open Source Software; used within the community to describe all software or technology that, broadly speaking, adheres to the ethical approach of Open Source software and/or Free Software, as well as its legal guidelines. FOSS Free or Open Source Software; alternative term for FLOSS.
- 678. 642 APPENDIX A ■ GLOS SA RY OF LINUX TERM S free When used to describe software or associated areas of technology, “free” indicates that the project abides by the ethical (if not legal) guidelines laid down by GNU Project, The. It doesn’t indicate that the software is free in a monetary sense; its meaning is quite different from “freeware.” Free Software Software in which the source code—the original listing created by the programmer—is available for all to see, share, study, and adapt to their own needs. This differs from the concept of open source, because the right of others to further modify the code is guaranteed via the GNU Public License (GPL) software license (or a compatible license). For various reasons, Free Software sometimes does not include the source code (although the software can still be legally decompiled), but this is rare. G gcc GNU Compiler Collection; programs used when creating binary executable files from source code. GID Group ID; numbering system used by the operating system to refer to a group. GIMP GNU Image Manipulation Program; high-powered image-editing program that runs under Linux, Unix, Windows, and other operating systems. Often preceded by the definite article: “The GIMP.” GNOME GNU Network Object Model Environment; a GUI-based desktop environment used by Ubuntu, as well as several other distributions. It uses the GTK+ libraries. See also KDE. GNU GNU’s Not Unix; see GNU Project, The. GNU/Linux Another name for the operating system referred to as Linux. The name GNU/Linux gives credit to the vast quantity of GNU Project, The software that is added to the Linux kernel within a distro to make a complete operating system. As such, GNU/Linux is the preferred term of many Free Software advocates.
- 679. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 643 GNU Project, The Organization created by Stallman, Richard in order to further the aims of Free Software and create the body of software that makes up the GNU operating system. GNU Public License Software license principally created by Stallman, Richard in order to protect software source code against proprietary interests and ensure that it will always be shared. It does this by insisting that any source code covered by the GNU Public License (GPL) must remain licensed under the GPL, even after it has been modified or added to by others. The Linux kernel, as well as much of the software that runs on it, uses the GPL. GPL See GNU Public License. grep Global Regular Expression Print; powerful shell command that lets you search a file or other form of input using regular expressions. Because of the ubiquity of the grep program, many Linux and Unix users refer to searching as “grepping.” To “grep a file” is to search through it for a string. group Collection of users under one heading (group name) to facilitate system administration. GRUB GRand Unified Bootloader; boot manager program that offers a menu from which you can choose which operating system you wish to boot. It’s needed to load the kernel program and thereby initiate the Linux boot procedure. GUI Graphical user interface; describes the software that provides a graphical system to display data and let you control your PC (usually via a mouse). guru One who is experienced and knowledgeable about Linux/Unix and is willing to share his or her knowledge with others. In a perfect world, every newbie would have his or her own guru. gzip One of the two preferred forms of file compression used under Linux. Files employing gzip compression usually have a .gz file extension. See also bzip2.
- 680. 644 APPENDIX A ■ GLOS SA RY OF LINUX TERM S H hack Ingenious and/or extremely efficient solution to a problem, particularly within the programming world. hacker Term used within the community to describe anyone who enjoys computers and possesses some skill therein, either in a professional capacity or as a hobby. This term is distinct from connotations of maliciously breaking into computers propagated by the media. See also cracker. host Shorthand referring to any computer that acts as a server to another computer. See also client. HP-UX Hewlett-Packard’s proprietary form of Unix designed to work on its own hardware platform. Hurd Kernel being developed by GNU Project, The. It’s not associated with the Linux kernel in any way. I info Source of documentation accessible from the shell; an alternative to the more established man page system. Also known as Texinfo. init The program that is automatically run after the kernel has finished loading, and therefore early in the boot procedure. It’s responsible for effectively starting the operating system. init.d Collection of startup scripts that make up the components of a run level. Under Ubuntu, these are found at /etc/init.d. Symbolic links to selected init.d scripts are contained in folders within /etc/init.d that are named after run level numbers, such as rc0.d, rc1.d, rc2.d, and so on. initrd Initial RAM disk; system used by the Linux kernel to load modules that are essential for the kernel to be able to boot, such as disk controllers.
- 681. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 645 inode Part of the usually invisible file system structure that describes a file, such as its ownership permissions or file size. ipchains Now deprecated component of version 2.2 of the Linux kernel that allows the creation of network security setups, such as firewalls or port-forwarding arrangements. Note that some distros still prefer to use ipchains. See also iptables. iptables Component of versions 2.4 and 2.6 of the Linux kernel that allows powerful network security setups. Chiefly used in the creation of firewalls, but can be used for more elementary arrange- ments such as network address translation (NAT) routers. J job How the BASH shell refers to a running program in order to facilitate administration by the user. journaling File system technology in which integrity is maintained via the logging of disk writes. K KDE K desktop environment; GUI and set of additional programs used on various distros, such as Mandriva and a variation of Ubuntu called Kubuntu. kernel Essential but ordinarily invisible set of programs that run the computer’s hardware and provide a platform on which to run software. In the Linux operating system, the kernel is also called Linux, after its creator, Torvalds, Linus. kernel panic Error message that appears when the kernel program in Linux cannot continue to work. In other words, a polite way of indicating a crash or, more often, a problem arising from user misconfiguration. This is most often seen when booting up after making incorrect changes to the system.
- 682. 646 APPENDIX A ■ GLOS SA RY OF LINUX TERM S kludge Community slang describing an inelegant way of making something work, usually not in a way that is generally accepted as being correct. Pronounced “kloodge.” Kubuntu Version of Ubuntu that substitutes the GNOME desktop environment for KDE. L LAMP Acronym describing a series of programs that work together to provide a complete Linux- based web-hosting environment. Stands for Linux, Apache, MySQL, and Perl, PHP, or Python (the last three in the list are scripting languages; see script). LGPL Lesser GPL; version of the GNU Public License (GPL) in which some use restrictions are slackened at the expense of various freedoms laid down by the main GPL. The LGPL is mostly used for library files. library General term referring to code that programs need to run and that, once in memory, is frequently accessed by many programs (leading to the phrase “shared library”). The most common and vital library is glibc (GNU C Library), created by GNU Project, The and the fundamental building block without which Linux could not operate. GNOME relies on the GTK+ libraries, among others. link File system method of assigning additional filenames to a file; also known as a “hard link.” See also symbolic link. Linux You mean you don’t know by now? Linux is what this book is all about. It is a kernel program created by Torvalds, Linus in 1991 to provide an inexpensive operating system for his computer, along with other components. These days, Linux is used to describe the entire operating system discussed in this book, although many argue (perhaps quite rightly) that this is inaccurate, and use the term GNU/Linux instead.
- 683. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 647 local Shorthand referring to the user’s PC or a device directly attached to it (as opposed to remote). localhost (1) Network name used internally by Linux and software to refer to the local computer, distinct from the network. (2) Default name given to a Linux-based PC when no other name is defined during installation. However, under Ubuntu, the name ubuntu is assigned if no name is defined by the user. M man page Documentation accessible from the shell that describes a command and how it should be used. Minix Operating system that is a rough clone of Unix, created by Professor Andrew Tanenbaum. It was the inspiration for Linux. module Program code that can be inserted or removed from the kernel in order to support particular pieces of hardware or provide certain kernel functions. Drivers under Windows perform the same function. mount To add a file system so that it is integrated (and therefore accessible) within the main file system; applies to external file systems, such as those available across networks, as well as those on the local PC, such as the hard disk or CD/DVD-ROMs. Mozilla Foundation Organization founded by Netscape to create open source Internet software, such as web browsers and e-mail clients; originally based on the Netscape source code. At the time of this writing, it produces the Firefox and Camino web browsers, the Thunderbird e-mail and Usenet client, the Bugzilla bug-tracking software, as well as other programs. MySQL Popular and powerful open source database application. See also LAMP.
- 684. 648 APPENDIX A ■ GLOS SA RY OF LINUX TERM S N newbie Term used to describe anyone who is new to Linux and therefore still learning the basics. It’s not a derogatory term! See also guru. NFS Network File System; reliable and established method of sharing files, printers, and other resources across a network of Unix-based operating systems. See also Samba. NTFS NT File System; file system offered by Windows NT, 2000, and XP. It can be read by Linux, but usually writing is prohibited because it is considered unsafe. See also FAT32. O OpenOffice.org Open Source office suite project created with the continuing input of Sun Microsystems and based on code Sun contributed to the Open Source community. Its commercial release is in the form of Star Office (although Star Office has several proprietary components added). open source (1) Method and philosophy of developing software whereby the source code—the original listing created by the programmer—is available for all to see. Note that open source is not the same as Free Software; describing software as open source doesn’t imply that the code can be shared or used by others (although this is often the case). (2) A community of users or any project that adheres to open-source values and/or practices. P partition Subdivision of a hard disk into which a file system can be installed. PID Process ID; the numbering system used to refer to a process.
- 685. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 649 pipe Method of passing the output from one command to another for further processing. Piping is achieved within the shell by typing the | symbol. POSIX Portable Operating System Interface; various technical standards that define how Unix-like operating systems should operate and to which the Linux operating system attempts to adhere. PPP Point-to-Point Protocol; networking technology that allows data transfer across serial connec- tions like telephone lines. In other words, it’s the technology that lets you connect to your Internet service provider using a modem. process The way the system refers to the individual programs (or components of programs) running in memory. proprietary Effectively, software for which a software license must be acquired, usually for a fee. This usually means the source code is kept secret, but it can also indicate that the source code is available to view but not to incorporate into your own projects or share with others. R Red Hat Well-known company that produces distributions of Linux. redirect To send the output of a command into a particular file. This also works the other way around: the contents of a particular file can be directed into a command. Redirection is achieved within the shell using the left and right angle brackets (< and >), respectively. regex See regular expression. regular expression Powerful and complex method of describing a search string, usually when searching with tools such as grep (although regular expressions are also used when programming). Regular expressions use various symbols as substitutes for characters or to indicate patterns.
- 686. 650 APPENDIX A ■ GLOS SA RY OF LINUX TERM S remote Indicates a computer or service that is available across a network, including but not limited to computers on the Internet (as opposed to local). root (1) The bottom of the Linux file system directory structure, usually indicated by a forward slash (/). (2) The user on some versions of Unix or Linux who has control over all aspects of hardware, software, and the file system. (3) Used to describe a user who temporarily takes on the powers of the root user (via the sudo command, for example). RPM Red Hat Package Manager; system used to install and administer programs under Red Hat, SUSE Linux, and some other distributions. See also APT. RTFM Read the freaking manual/man page; exclamation frequently used online when a newbie asks for help without having undertaken basic research. run level Describes the current operational mode of Linux (typically, the services that are running). Run level 1 is single-user mode (a stripped-down system with minimal running services); run levels 2 through 5 provide a GUI; run level 6 is reboot mode (switching to it will cause the computer to terminate its processes and then reboot); run level 0 is shutdown (switching to it will cause the PC to shut down. S Samba Program that re-creates under Unix or Linux the Microsoft SMB-based system of sharing files, printers, and other computer resources across a network. It allows Linux to become a file or printer server for Linux and Windows computers, and also allows a Linux client to access a Windows-based server. scalable Term describing the ability of a single computer program to meet diverse needs, regardless of the scale of the potential uses. The Linux kernel is described as being scalable, because it can run supercomputers, as well as handheld computers and home entertainment devices.
- 687. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 651 script Form of computer program consisting of a series of commands in a text file. Most shells allow some form of scripting, and entire programming languages such as Perl are based around scripts. In the context of the Linux operating system, shell scripts are usually created to perform trivial tasks or ones that frequently interact with the user. Shell scripts have the advantage that they can be frequently and easily modified. The Linux boot process relies on several complex scripts to configure essential system functions such as networking and the GUI. See also init. server (1) Type of computer designed to share data with other computers over a network. (2) Software that runs on a computer and is designed to share data with other programs on the same PC or with other PCs across a network. service Background program that provides vital functions for the day-to-day running of Linux; also known as a daemon. Services are usually started when the computer boots up and as such are constituent parts of a run level. shell Broadly speaking, any program that creates an operating environment in which you can control your computer. The GNOME desktop can be seen as a shell, for example. However, it’s more commonly understood within Unix and Linux circles as a program that lets you control the system using commands entered at the keyboard. In this context, the most common type of shell in use on Linux is BASH. Shuttleworth, Mark Entrepreneurial South African businessman who, as a long-term Debian hacker, devised and financially supports Ubuntu via his company, Canonical Ltd. SMB Server Message Block; network technology for sharing files, printers, and other resources. See also Samba. Solaris Form of Unix sold by Sun Microsystems; runs on proprietary hardware systems as well as on commodity systems based on Intel and AMD processors. source code The original program listing created by a programmer. Most programs that you download are precompiled—already turned into binary executables ready for general use—unless you specifically choose to download and compile the source code of a program yourself.
- 688. 652 APPENDIX A ■ GLOS SA RY OF LINUX TERM S SSH Secure SHell; program that lets you access a Linux/Unix computer across the Internet. SSH encrypts data sent and received across the link. SSL Secure Sockets Layer; form of network data transfer designed to encrypt information for security purposes. It’s used online for certain web sites and also within Linux for certain types of secure data exchange. Stallman, Richard M. Legendary hacker who founded GNU Project, The and created the concept of copyleft, as well as the software license that incorporates it: the GNU Public License (GPL). See also Torvalds, Linus. standard error Linux and Unix shorthand for the error output provided by a command. standard input Linux and Unix shorthand for the device usually used to provide input to the shell. For the majority of desktop PC users, this refers to the keyboard. standard output Linux and Unix shorthand for the device usually used to display output from a command. For the majority of desktop PC users, this refers to the screen. string A word, phrase, or sentence consisting of letters, numbers, or other characters that is used within a program and is often supplied by the user. sudo Program that runs under Unix and Linux by which ordinary users are temporarily afforded administrator rights. Ubuntu relies on sudo as the exclusive way for users to administer the system. SVG Scalable Vector Graphics; vector graphics technology. SVG is actually an XML markup language designed to create 2D graphics, increasingly used for Linux desktop icons and web graphics. swap Area of the hard disk that the Linux kernel uses as a temporary memory storage area. Desktop or server Linux differs from Windows in that it usually requires a separate hard disk partition in which to store the swap file.
- 689. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 653 symbolic link Type of file akin to a Windows shortcut. Accessing a symbolic link file routes the user to an actual file. See also link. sysadmin Systems administrator; a way of describing the person employed within a company to oversee the computer systems. In such an environment, the sysadmin usually is the root user of the various computers. System V Variant of Unix used as a foundation for modern forms of proprietary Unix. T tainted Describes a kernel that is using proprietary modules in addition to Open Source modules. Can also refer to insecure software. tar Tape ARchive; software able to combine several files into one larger file in order to back them up to a tape drive or simply transfer them across the Internet. Such files are usually indicated by a .tar file extension. Note that a tar file isn’t necessarily compressed; the bzip2 and gzip utilities must be used if this is desired. TCP/IP Transmission Control Protocol/Internet Protocol; standard protocol stack used by most modern operating systems to control and communicate across networks and also across the Internet (as opposed to NetBEUI, commonly available on older versions of Windows, and IPX/SPX, used on Novell’s NetWare operating system). terminal Another word for shell. TeX Method and set of programs for typesetting complex documents. Invented prior to word processors and desktop publishing software, and now considered a specialized tool for laying out scientific texts. An updated version of the program called LaTeX is also available.
- 690. 654 APPENDIX A ■ GLOS SA RY OF LINUX TERM S Torvalds, Linus Finnish programmer who, in 1991, created the initial versions of the Linux kernel. Since then, he has taken advantage of an international network of volunteers and staff employed by various companies who help produce the kernel. Torvalds himself contributes to and oversees the efforts. tty TeleTYpewriter; shorthand referring to underlying Linux virtual devices that allow programs and users to access the kernel and thereby run programs. Tux The name of the penguin character that is the Linux mascot. The original Tux graphic was drawn by Larry Ewing. U Ubuntu Linux distribution with several unique characteristics. Ubuntu is designed primarily for desktop use, although several server versions are available. It is intended for use by individuals in any location in the world, so it has strong multiple language support. It’s run by the Ubuntu Foundation, which is financially backed by Shuttleworth, Mark. Each release is guaranteed to be supported for 18 months (5 years in the case of server releases). Ubuntu Foundation Organization set up by Shuttleworth, Mark and his company, Canonical, Ltd., to administer and provide support for the Ubuntu distribution of Linux. UID User ID; numbering system used by the operating system to refer to a user. Unix Seminal operating system created as a research project in 1969 by Kenneth Thompson and Dennis Ritchie at Bell Labs (later AT&T). Because it was initially possible to purchase the source code for a fee, subsequent revisions were enhanced by a variety of organizations and went on to run many mainframe and minicomputer systems throughout the 1980s, 1990s, and up to the present. Nowadays, Unix is fragmented and exists in a variety of different versions. Perhaps most popular is its Open Source rendition, BSD Unix, which has seen many devel- opments since the source code was first released. This means that BSD Unix no longer exists but has instead diversified into a number of separate projects. Proprietary versions are also available, including Solaris, HP-UX, and AIX.
- 691. A PPENDIX A ■ GLOS SARY OF LINUX TERMS 655 user The way the operating system refers to anyone who accesses its resources. A user must first have a user account set up, effectively giving that user his or her own private space on the system. In addition to actual human users, an average Linux system has many other user accounts created to let programs and services go about their business. These are usually not seen by human users. V variable A changeable value that stores a certain data type (such as a number, date, or string), remem- bering it for future reference by the system or script it is defined by. Variables defined by and for the Linux kernel are vital to it. verbose Command option that will cause it to return more detailed output (or, in some cases, to return actual output if the command is otherwise “quiet”); usually specified by adding the -v command option. VFAT Virtual File Allocation Table; technical name of Microsoft’s FAT file system offered under Windows and also on removable storage devices such as flash memory cards. vi Arcane text editor and pseudo-shell beloved by Unix aficionados that can be used for creation of text files or for creating programs. Traditionally, Unix users either love or hate vi; some prefer Emacs. Nowadays new and improved versions of vi are available, such as vim, used under Ubuntu. W Wine Short for Wine Is Not an Emulator; software that re-creates the Windows Application Programming Interface (API) layer within Linux and lets users run Windows programs. workspace X terminology referring to a GUI desktop.
- 692. 656 APPENDIX A ■ GLOS SA RY OF LINUX TERM S X X Short for X Window; software that controls the display and input devices, thereby providing a software foundation on top of which desktop managers like GNOME are able to run. X11 Version 11 of the X software, currently in use on most desktop Linux systems. XFree86 Project Organization that creates X software. At one time, every distribution of Linux used XFree86 software, but most now use similar software from the X.org organization. xinetd The service responsible for starting various network servers on the computer. XMMS Audio player program. X.org Organization that produces the X Window software and, in particular, a set of programs called X11. X11 is used on most modern distributions of Linux. It is backed by a number of Unix and Linux industry leaders. xterm Simple program that allows you to run a shell under X. This program has the advantage of being available on most Linux systems that offer a GUI.
- 693. APPENDIX B ■■■ BASH Command Index T his appendix provides a whistle-stop tour of commands that can be used at the BASH shell. This is a highly selective listing, intended to provide a guide to commands that see day- to-day use on average desktop systems. In a similar fashion, although some command options are listed, they’re strictly limited to those that receive regular deployment. The descriptions of each command are deliberately simple. Note that the quantity of space a command is given is not an indication of its importance or usefulness. To this end, commands in the list with an asterisk after their name offer far more than hinted at by its brief description hints. In such cases, we strongly advise that you refer to the command’s man page for more information. Various conventions are used in the list: • You should substitute your own details wherever italicized words appear. • Commands that can and might be run by ordinary users are preceded with a dollar sign ($). • Commands that require root privileges (the use of sudo) are preceded with a hash symbol (#). Commands that present dangers to the system through misuse are clearly marked. Such commands should not be used without research into the command’s usage and function. 657
- 694. 658 APPENDIX B ■ BA SH C OMM AND INDEX Command Description Typical Command Options Examples of Use $ alias Create or display alias list=ls command aliases $ alsamixer Alter audio volume levels alsamixer $ apropos Search man pages for apropos "word specified words/phrases or phrase" $ apt-cache Search, query, and otherwise search: Search for specified apt-cache search manipulate the APT database package (regexes may be packagename cache (see apt-get) used; see Chapter 15) showpkg: Show information about specified package depends: Show package de- pendencies of specified package, and show other packages that can meet that dependency # apt-get Multifunction tool use to install: search for and in- apt-get install install, remove, and otherwise stall specified package from packagename administer software packages, repositories (as specified in according to the APT database /etc/apt/sources.list) update: Update or build package database by con- tacting package repositories upgrade: Attempt to upgrade all current installed packag- es with new versions dist-upgrade: Attempt to upgrade all currently installed packages, automat- ically and aggressively resolving package conflicts; often used to upgrade entire distro to new version remove: Opposite of install; removes packages clean: Remove any old package installation files that are stored on hard disk -f: Attempt to fix broken package dependencies (used with install or remove) --force-yes: Override any errors and thereby bypass apt-get’s protective mea- sures. Dangerous option— use with care!
- 695. APPENDIX B ■ BA SH COMMA ND INDEX 659 Command Description Typical Command Options Examples of Use $ bzip2 Compress specified file -d: Decompress bzip2 myfile (replaces original file with specified file compressed file and gives -k: Don’t delete original file it .bz2 file extension) -t: Test; do a dry run with- out writing any data $ bzip2recover Attempt recovery of specified bzip2recover damaged .bz2 file myfile.tar.bz2 $ cal Display calendar for cal 4 2005 current month (or specified month/year) $ cat Display a file on screen or cat myfile combine and display two files together $ cd Change to specified directory cd /usr/bin $ cdparanoia * Convert CD audio tracks -B: Batch mode; convert all cdparanoia -S 8 -B to hard disk files tracks to individual files -S: Set CD read speed (2, 4, 8, 12, and so on; values relate to CD-drive spin speed; used to avoid read errors) # cdrecord * Burn audio or CD-R/RW -dev=: Specify the drive’s cdrecord dev=0,0,0 data discs (the latter usually device number (can be dis- -speed=16 -v based on an ISO image; see covered by running cdrecord myfile.iso mkisofs) with the scanbus option) --scanbus: Scan to see which CD-R/RW drives are present and return device numbers -speed=: Specify the write speed (2, 4, 6, 8, and so on) -v: Verbose output; obligato- ry for feedback on cdrecord’s progress # cfdisk * DANGEROUS! Menu-based cfdisk /dev/hda disk-partitioning program # chgrp Change group ownership -R: Recursive; apply changes chgroup mygroup of a file/directory to subdirectories myfile $ chmod Change permissions of a file/ -R: Recursive; apply chmod a+rw myfile directory (where a=all, u=user, to subdirectories g=group; and r=read, w=write, --reference=: Copy permis- x=executable) sions from specified file $ chown Change file ownership to -R: Recursive; apply to chown username specified username subdirectories myfile1
- 696. 660 APPENDIX B ■ BA SH C OMM AND INDEX Command Description Typical Command Options Examples of Use # chroot Change the root of the file chroot /home/ system to the specified path mydirectory # chvt Switch to the specified chvt 3 virtual terminal (equivalent of holding down Ctrl+Alt and pressing F1–F6) $ clear Clears terminal screen and clear places cursor at top $ cp Copy files -r: Recursive; copy subdirec- cp myfile1 tories and the files therein directory/ -s: Create symbolic link instead of copying $ crontab Edit or display the user’s -e: Edit the crontab file crontab -e crontab file (scheduled tasks) (create/amend) -l: List crontab entries -r: Delete the crontab file -u: Specify a user and edit their crontab file $ date Display the date and time date $ df Display free disk space -h: Human readable; df -h within file system display sizes in KB, MB, GB, and TB, as appropriate -l: Restrict to local file systems, as opposed to network mounts $ diff Display differences -a: Consider all files diff myfile1 between specified files text files (don’t halt myfile2 when asked to compare binary files) -i: ignore lowercase and uppercase differences $ diff3 Display differences between diff3 myfile1 three specified files myfile2 myfile3 $ dig Look up IP address of dig mysite.com specified domain $ dmesg Display kernel message log dmesg # dosfsck * Check and repair MS-DOS– -a: Repair without asking dosfsck -rv /dev/ based file hard disk partition user for confirmation hda4 (see also fsck) -r: Repair file system asking user for confirmation when two or more repair methods are possible -v: Verbose; display more information
- 697. APPENDIX B ■ BA SH COMMA ND INDEX 661 Command Description Typical Command Options Examples of Use # dpkg Install, remove, and -i: Install specified package dpkg –i otherwise administer packagename.deb -r: Remove (uninstall) local installation packages specified package (on your hard disk); see also apt-get -I: Show info about specified package --ignore-depends= packagename.deb: Don’t halt on package dependency issues (dangerous!) # dpkg-reconfigure Reconfigure an already dpkg-reconfigure installed package packagename $ du Show sizes of files and -h: Human readable; du -h /home/myuser folders in kilobytes produce output in MB, GB, and TB -s: Summary; display totals only for directories rather than for individual files $ eject Eject a removable -t: Close an already eject /media/ storage disk open tray dvd-rom $ ex * Start a simple text-editor ex myfile.txt program used principally within shell scripts $ exit Log out of shell (end session) exit $ fdformat Low-level format a floppy disk fdformat /dev/fd0 (this won’t create a file system; see also mkfs) # fdisk * DANGEROUS! Hard-disk -l: List partition table fdisk /dev/hda partitioning program $ fg Brings job running in back- fg 1 ground to foreground $ file Display information about file myfile specified file, such as its type $ find * Find files by searching -maxdepth: Specify the find -name "myfile" directories (starting in number of subdirectories current directory) levels to delve into, starting from 1 (current directory) -name: Specify name of file to search for -type: Specify file types to be returned; -type d returns directories and -type f returns only files
- 698. 662 APPENDIX B ■ BA SH C OMM AND INDEX Command Description Typical Command Options Examples of Use $ free Display information about -m: Show figures in MB free -m memory usage -t: Total the columns at bottom of table # fsck * Check file system for fsck /dev/hda1 errors (usually run from rescue disc) $ ftp * FTP program for ftp ftp.mysite.com uploading/downloading to remote sites $ fuser Show which processes -v: Verbose; detailed fuser -v myfile are using a particular file output or file system $ grep * Search specified file -i: Ignore uppercase and grep "phrase I want for specified text string lowercase differences to find" myfile.txt (or word) -r: Recursive; delve into subdirectories (if applicable) -s: Suppress error messages about inaccessible files and other problems # groupadd Create new group groupadd mygroup # groupdel Delete specified group groupdel mygroup $ groups Display groups the specified groups myuser user belongs to $ gzip Compress files and replace -d: Decompress gzip myfile original file with compressed specified file version -v: Verbose; display degree of compression # halt Initiate shutdown procedure, -p: Power off system halt -p ending all processes and at end of shutdown unmounting all disks procedure # hdparm * DANGEROUS! Tweak or hdparm /dev/hda view hard disk settings $ head Print topmost lines of text files -n: Specify number of lines head myfile.txt (default is first 10 lines) (such as -n 5) $ help Display list of common help BASH commands $ history Display history file (a list of history recently used commands)
- 699. APPENDIX B ■ BA SH COMMA ND INDEX 663 Command Description Typical Command Options Examples of Use $ host Query DNS server based -d: Verbose; return more host 82.211.81.166 on specified domain name information or IP address -r: Force name server to return its cached informa- tion rather than query other authoritative servers $ hostname Display localhost-style name hostname of computer $ id Display username and id myuser group info of specified user (or current user if none specified) # ifconfig * Display or configure settings down: Disable interface ifconfig eth0 of a network interface (assign (used at end of command 192.168.0.10 an IP address, subnet mask, chain) netmask 255.255.0.0 and activate/deactivate it) up netmask: Specify a subnet mask up: Enable interface (used at end of command chain) $ info * Display info page for info command specified command # init Change current run level init 1 $ jobs Display list of jobs jobs running in background $ kill Kill specified process kill 1433 $ killall Kill process(es) that have -i: Confirm before killall specified name(s) killing process processnumber -v: Verbose; report if and when successful $ last Display details of recent last logins, reboots, and shutdowns $ ldd Display system files ldd /usr/bin/program (libraries) required by specified program $ less Interactively scroll -q: Quiet; disable beeps less myfile.txt through a text file when end of file is reached or other error encountered -i: Ignore case; make all searches case-insensitive unless uppercase letters are used
- 700. 664 APPENDIX B ■ BA SH C OMM AND INDEX Command Description Typical Command Options Examples of Use $ ln Create links to specified -s: Create symbolic link ln -s myfile1 files, such as symbolic links (default is hard link) myfile2 $ lpr Print file (send it to the -V: Verbose; print informa- lpr myfile.txt printer spool/queue) tion about progress of print job $ lpstat Display print queue lpstat $ ls List directory -a: List all files, including ls -h mydirectory hidden files -d: List only directory names rather than their contents -h: Human readable; print figures in KB, MB, GB, and TB -l: Long list; include all details, such as file permissions -m: Show as comma- separated list # lsmod Display currently loaded lsmod kernel modules $ lsof Display any files -u: Limit results to files lsof -u username currently in use used by specified user $ man Display specified man command command’s manual $ md5sum Display MD5 checksum md5sum myfile (normally used to confirm a file’s integrity after download) # mkfs * DANGEROUS! Create specified -t: Specify type of mkfs -t vfat file system on specified device file system /dev/fd0 (such as a floppy disk)
- 701. APPENDIX B ■ BA SH COMMA ND INDEX 665 Command Description Typical Command Options Examples of Use $ mkisofs * Create ISO image file -o: Options; this must mkisofs -o from specified directory appear after command isoimage.iso -R -J (usually for burning to disc to indicate that command -v mydirectory with cdrecord) options follow -apple: Use Mac OS extensions to make disc readable on Apple computers -f: Follow symbolic links and source actual files -J: Use Joliet extensions (make ISO compatible with Windows) -R: Use Rock Ridge exten- sions (preferred Linux CD- ROM file system) -v: Verbose; display more information (-vv for even more info) # modinfo Display information modinfo modulename about kernel module # modprobe Insert specified module -k: Set module’s autoclean modprobe modulename into the kernel, as well as flag so it will be removed any others it relies on from memory after inactivity -r: Remove specified module as well as any it relies on to operate $ more Interactively scroll through more myfile.txt text file (similar to less) # mount * Mount specified file system -o: Specify command mount /dev/hda4 /mnt at specified location options, such as rw to allow read/write access; various types of file systems have unique commands $ mv Move (or rename) specified -b: Back up files mv myfile files and/or directories before moving mydirectory/ -v: Display details of actions carried out $ netstat * Show current network netstat -a connections $ nice Run specified command with -n: Specify priority, ranging nice -n 19 specified priority from the highest priority of –20, to 19, which is the lowest priority $ nohup Run specified command nohup command and continue to run it, even if user logs out
- 702. 666 APPENDIX B ■ BA SH C OMM AND INDEX Command Description Typical Command Options Examples of Use $ passwd Change user’s password passwd $ ping Check network connectivity -w: Exit after specified ping mydomain.com between local machine and number of seconds specified address (such as -w 5) $ printenv Display all environment printenv variables for current user $ ps * Display currently a: List all processes ps aux running processes (note that command options don’t require preceding dash) f: Display ownership of processes using tree- style graphics u: Limit results to processes running for and started by current user x: Include processes in results not started by user but running with the user ID $ pwd Display current directory pwd # reboot Reboot computer reboot $ renice Change a process’s priority renice 19 10704 while it’s running (see nice) $ rm Delete single or multiple files -r: Recursive; delete rm -rf mydirectory and/or directories specified directories and any subdirectories -f: Force; don’t prompt for confirmation before deleting (use with care!) # rmmod Delete module from kernel rmmod modulename # route * Add and create (or view) route add default entries in routing table gw 192.168.1.1 (see ifconfig) $ runlevel Display current run level runlevel $ screen * Program that runs -ls: Display list of screen pseudo shell that is currently running kept alive regardless of screen sessions current user login -R: Reattach to already running screen session or start new one if none available $ sftp * Secure Shell FTP; like FTP sftp username but running over an ssh @192.168.1.14 connection (see ssh)
- 703. APPENDIX B ■ BA SH COMMA ND INDEX 667 Command Description Typical Command Options Examples of Use $ shred Overwrite data in a file -u: Delete file in addition shred -fv myfile with gibberish, thereby to overwriting making it irrecoverable -v: Verbose; show details of procedure -f: Force permissions to allow writing if necessary $ sleep Pause input for the specified sleep 10m period of time (where s=seconds, m=minutes, h=hours, d=days) $ smbclient * FTP-style program smbclient //192.168. with which you can log 1.1/ in to a SMB (Windows)- based file share $ sort Sort entries in the specified sort myfile.txt -o text file (default is ASCII sort) sorted.txt $ ssh * Log in to remote computer ssh username@ using secure shell 192.168.1.15 $ startx Start GUI session (if GUI isn’t startx already running) $ su Temporarily log in as -: Adopt user’s environment su specified user; log in as variables, such as $PATH root if no user specified (provided root account is activated) $ sudo Execute specified command sudo command with root privileges $ tac Display specified text file tac myfile.txt but in reverse (from last to first line) $ tail Display final lines of -n: Specify number of tail myfile.txt specified text file lines to display (such as -n4) $ tar * Combine specified files and/or -c: Create new archive tar -zcf myfile. directories into one larger file, tar.gz mydirectory -j: Use bzip2 in order or extract from such a file to compress (or decom- press) files -f: Specifies filename (must be last in chain of command options) -r: Add files to existing archive -x: Extract files from existing archive -z: Use gzip to compress (or decompress) files
- 704. 668 APPENDIX B ■ BA SH C OMM AND INDEX Command Description Typical Command Options Examples of Use $ tee Display piped output and ls -lh| tee also save it to specified file listing.txt $ top * Program that both displays top and lets the user manipulate processes $ touch Give specified file current touch myfile time and date stamp; if it doesn’t exist, create a zero- byte file with that name $ tracepath Discover and display tracepath network path to another host 192.168.1.20 $ umask Set default permissions umask u=rwx,g=r,o= assigned to newly created files # umount Unmount a file system umount /media/cdrom # useradd Add new user -m: Create home useradd -m username directory for user # userdel Delete all mention of user in -r: Remove user’s userdel -r username system configuration files home directory (effectively deleting the user, although files owned by the user might remain) $ unalias Remove specified alias -a: Remove all aliases unalias command (use with care!) $ uname Display technical information -a: Display all basic uname -a about current system information $ unzip Unzip a Windows-compatible -l: Display archive content unzip myfile.zip Zip file but don’t actually unzip $ uptime Display uptime for system, uptime as well as CPU load average and logged-in users $ vim * Text editor program vim $ wc Count the number of words wc myfile.txt in a file $ whatis Display one-line summary whatis command of specified command $ whereis Display information on -b: Return information whereis -b command where a binary command only about binary is located, along with its programs source code and man page (if applicable)
- 705. APPENDIX B ■ BA SH COMMA ND INDEX 669 Command Description Typical Command Options Examples of Use $ xhost Configure which +: When followed by xhost + users/systems can run a username and/or system programs on the X server name, gives the user/system permission to run programs on the X server; when used on its own, lets any user/system use the X server -: Opposite of + $ xinit Start elementary GUI session xinit (when not already running a GUI) $ zip Create Windows-compatible -r: Recursive; includes zip -r myfile.zip compressed Zip files all subdirectories and files mydirectory therein -u: Updates Zip with specified file -P: Encrypts Zip with specified password -v: Verbose; display more information -#: Set compression level (from 0, which is no compression, to 9, which is highest) $ zipgrep Searches inside Zip files zipgrep "search for specified text string phrase" myfile.zip
- 707. APPENDIX C ■■■ Getting Further Help S o you’ve read through this book and have a good working knowledge of Linux. Ubuntu is running exactly as you want it to, and things are going okay. But then you hit a brick wall. Perhaps you want to perform a task but simply don’t know how. Or maybe you know roughly what you need to do but don’t know the specifics. Although this book tries to be as comprehensive as possible, it can’t cover every eventuality. You need to find some help, but where do you turn? Fortunately, many sources of information are available to those who are willing to help themselves. Linux contains its own series of help files in the form of man and info pages, and these are good places to start. In addition, some programs come with their own documentation. If neither of these sources provides the help you need, you can head online and take advantage of the massive Linux community around the world. Read the Manual! Before asking for help online, it’s important that you first attempt to solve your problems by using Linux’s built-in documentation. If you go online and ask a question so simple that it can be answered with a little elementary research, you might find people reply with “RTFM.” This stands for Read the Freaking Manual. In other words, do some basic research, and then come back if you’re still stuck. It’s not that people online don’t want to help. It’s that they don’t like people who are too lazy to help themselves and expect others to do the hard work for them. Although not all Linux people you encounter will take such a hard line, doing a little homework first can provide answers to a lot of questions, removing the need to ask others. This is particularly true when it comes to the fundamentals. Documentation typically comes in three formats: man pages, info pages, and README files. 671
- 708. 672 APPENDIX C ■ GETTING FURTHER HELP Man Pages Man pages are the oldest form of Unix documentation. In the old days, once an individual had created a piece of software, he would write a brief but concise man page in order to give others a clue as to how to operate it. The programmer would come up with a few screens of documentation that could be called up from the command prompt. This docu- mentation would outline what the software did and list all the ways in which it could be used. Nowadays, depending on the software package, man pages are usually created by tech- nical writers, but the concept of providing essential information still applies. Man pages under Linux provide all the information you need about how to use a particular command or piece of software. Sounds great, doesn’t it? Alas, there’s a problem: man pages are written by software engineers for software engineers. They expect you to already understand the technology being discussed. This is illustrated very well by the man page for cdrecord, software that can be used to burn CD images to disc. You can view this man page by typing man cdrecord at the command prompt. The first line of the man page states, “Cdrecord is used to record data or audio Compact Discs on an Orange Book CD-Recorder or to write DVD media on a DVD-Recorder.” Most of that is clear, but what do they mean by “Orange Book”? They don’t explain. (If you’re curious, head over to http://searchstorage.techtarget.com/sDefinition/ 0,,sid5_gci503648,00.html.) Further down in the man page, you see, “Cdrecord is completely based on SCSI commands . . . Even ATAPI drives are just SCSI drives that inherently use the ATA packet interface as [a] SCSI command transport layer.” What’s SCSI, or ATAPI for that matter? Again, the man page doesn’t explain. (They’re methods of interfacing with storage devices attached to your computer.) But why should man pages explain as they go along? Their function is to describe how to use a piece of software, not to provide a beginner’s introduction to technology. If they did that, a single man page could run to hundreds of pages. In other words, man pages are not for complete beginners. This isn’t always the case and, because Linux sees widespread usage nowadays, man pages are sometimes created with less knowledgeable users in mind. But even so, the format is inherently limited: man pages provide concise guides to using software. Luckily, there are some tips you can bear in mind to get the most from a man page. But before you can use those tips, you need to know how to read a man page. How to Read a Man Page To read a man page, you simply precede the command name with man. For example, to read the man page of cdrecord, a piece of software used to write ISO images to CD-R/RW discs, type the following command: man cdrecord
- 709. A PPEN DI X C ■ GET T ING FURT H ER H ELP 673 This opens a simple text viewer with the man page displayed. You can move up and down line by line with the cursor keys, or move page by page using the Page Up and Page Down keys (these are sometimes labeled Pg Up and Pg Down). You can search by hitting the forward slash key (/). This will highlight all instances of the word you type. You can search for other examples of the word in the document by hitting the n key. The average man page will include many headings, but the following are the most common: Name: This is the name of the command. There will also be a one-sentence summary of the command. Synopsis: This lists the command along with its various command options (some- times known as arguments or flags). Effectively, it shows how the command can be used. It looks complicated, but the rules are simple. First is the command itself. This is in bold, which indicates it is mandatory. This rule applies to anything else in bold: it must be included when the command is used. Anything contained within square brackets ([]) is optional, and this is usually where you will find the command options listed. A pipe symbol (|) separates any command options that are exclusive, which means that only one of them can be used. For example, if you see [apple|orange|pear], only one of apple, orange, or pear can be specified. Usually at the end of the Synopsis listing will be the main argument, typically the file(s) that the command is to work on and/or generate. Description: This is a concise overview of the command’s purpose. Options: This explains what the various command options do, as first listed in the Synopsis section. Bearing in mind that command options tell the software how to work, this is often the most useful part of the man page. Files: This lists any additional files that the command might require or use, such as configuration files. Notes: If this section is present (and often it isn’t), it sometimes attempts to further illuminate aspects of the command or the technology the command is designed to control. Unfortunately, Notes sections can be just as arcane as the rest of the man page. See Also: This refers to the man pages of other commands that are linked to the command in question. If a number appears in brackets, this means the reference is to a specific section within the man page. To access this section, type: man <section no> command. Although there are guidelines for the headings that should appear in man pages, as well as their formatting, the fact is that you may encounter other headings, or you may find nearly all of them omitted. Some man pages are the result of hours if not days of effort; others are written in ten minutes. Their quality can vary tremendously.
- 710. 674 APPENDIX C ■ GETTING FURTHER HELP Tips for Working with Man Pages The trick to quickly understanding a man page is decoding the Synopsis section. If you find it helps, split the nonobligatory command options from the mandatory parts. For example, cdrecord’s man page says that you must specify the dev= option (it’s in bold), so at the very least, the command is going to require this: cdrecord dev=X filename Then you should skip to the Options section and work out which options are relevant to your requirements. While you’re there, you’ll also need to figure out what the dev= command option requires. Although the command options contained in square brackets in the Synopsis section are, in theory, nonobligatory, the command might not work satisfactorily without some of them. For example, with cdrecord, we use the -speed command option, which sets the burn speed, and also the -v option, which provides verbose output (otherwise, the command runs silently and won’t display any information on screen, including error messages!). Another handy tip in decoding man pages is understanding what standard input and standard output are. In very simple terms, standard input (stdin) is the method by which a command gets input—the keyboard on most Linux setups. Standard output (stdout) is where the output of a command is sent, which is the screen on most Linux setups. (See Chapter 15 for more details about standard input and standard output.) Often, a man page will state that the output of a command will be sent to standard output. In other words, unless you specify otherwise, its output will appear on screen. Therefore, it’s necessary to specify a file to which the data will be sent, either by redirecting the output (see Chapter 17), or by specifying a file using a command option. For example, the mkisofs command can be used to create ISO images from a collection of files for subse- quent burning to CD. But unless the -o option is used to specify a filename, mkisofs’s output will simply be sent to standard output—it will appear on the screen. Finally, here’s the best tip of all for using man pages: don’t forget that man has its own man page. Simply type man man. Info Pages Man pages date from the days of relatively primitive computers. Back then, most computers could only display page after page of text, and allow the user to scroll through it. In addi- tion, memory and disk space were scarce, which is why some man pages are incredibly concise— fewer words take up less memory! The Texinfo system is a valiant by the GNU Project attempt to overcome the shortfalls of man pages. Often, this is referred to as info, because that’s the command used to summon Texinfo pages (normally, you type info command).
- 711. A PPEN DI X C ■ GET T ING FURT H ER H ELP 675 For starters, info pages are more verbose than the equivalent man pages, and that gives the author more space to explain the command or software. This doesn’t necessarily mean that info pages are easier to understand, but there’s a better chance of that being the case. Secondly, info pages contain hyperlinks, just like web pages. If you move the cursor over a hyperlinked word, which is usually indicated by an asterisk (*), you can proceed to a related page. In a similar sense, pages are linked together so that you can move back and forth from topic to topic. The bad news is that the man page system is far more popular and established than Texinfo. If a programmer creates a new application, for example, it’s unlikely he’ll bother with an info page, but he will almost certainly produce a man page. In fact, in many cases, typing info command will simply bring up the man page, except in the software used to browse info pages. However, nearly all the GNU tools are documented using info pages, either in their own pages or as part of the coreutils pages. For example, to read about the cp command and how to use it, you can type this: info coreutils cp To browse through all sections of the coreutils pages, type this: info coreutils Because man pages are so established, everyone expects to find one for every utility. So most utilities that have info pages will also have man pages. But in such a case, the man page will state near the end that the main documentation for the utility is contained in an info page, and you may find it more fruitful to use that instead. Navigating through info pages is achieved via the keyboard and is something of an art. But, as you might expect, there’s a user-friendly guide to using info: just type info info. Remember that words preceded with an asterisk are hyperlinks, and you can jump from link to link using the Tab key. README Files and Other Documentation Some programs come with their own documentation. This is designed to give users the information they need to get started with the program (as opposed to the man page, which is a concise and complete guide to the software). Alternatively, program documen- tation sometimes gives a brief outline of the program’s features. The files are usually simple text, so they can be read in any text editor or word processor, and are normally called README. Under Ubuntu, these documents are usually stored in a program-specific directory within /usr/share/doc (although a small minority of programs use /usr/doc).
- 712. 676 APPENDIX C ■ GETTING FURTHER HELP Not all programs are friendly enough to provide such documentation, but even so, you’ll still find a directory for the software in /usr/share/doc. This is because the software might also come with a getting started guide written by the Ubuntu package maintainer. Such guides detail specifics of using the software under Ubuntu, such as where configura- tion files are located or how the program interoperates with other software on the system. Sometimes, this documentation is written by a Debian package maintainer because nearly all Ubuntu software has its origins in the Debian project (www.debian.org). In addition, the directory will probably contain copyright information, explaining the software license used by the software, as well as a CHANGELOG, which is a text file listing features that have been added to each release of the software. The directory might contain some other files, too, detailing where to send information about bugs, for example. Viewing the README documentation is easy. For example, for the sudo command, you could type this: cd /usr/share/doc/sudo less README Sometimes, the README documentation is in a compressed tarball, in which case it will have either a .tar.gz or a .tar.bz2 file extension. However, less is clever enough to realize this and extract the document for reading. Getting Help Online If you can’t figure out the answer by referring to the documentation, then there’s little choice other than to look online. Linux benefits from a massive community of users, all of whom are usually willing to help each other. The best way of getting help is to visit a forum. Here, you can post messages for others to reply to. Alternatively, you might choose to sign up for a mailing list. This is a way of sending e-mail to several hundreds, if not thousands, of people at once. Any individual can then reply. Mailing lists often have the benefit of allowing personal attention and interaction, but this comes at the expense of each subscriber receiving a whole lot of mail. Forums The official Ubuntu project forums are located at www.ubuntuforums.org. You’ll find forums for just about every need, from security to beginner’s issues, but by far, the most popular is the one devoted to the current release of Ubuntu, which is under the heading Ubuntu Release Assistance. Look in the General Help forum if your question isn’t specifically related to one of the other technology areas listed.
- 713. A PPEN DI X C ■ GET T ING FURT H ER H ELP 677 Before you can post, you need to register by providing an e-mail address. This is designed to keep down the quantity of unwanted junk postings to the forum. You might think it fine to post a new question immediately after registering, but don’t forget the simple rules mentioned at the beginning of this appendix: if you don’t do elemen- tary research first and try to solve your own problem, you may elicit a hostile response from the other posters, especially if your question is one that comes up time and time again and has been answered several times. So, first make use of the comprehensive search facility provided with the forums. For example, if you’re looking for advice on getting a Foomatic D1000 scanner working, use this as a search term and see what comes up. The chances are that you won’t be the first person who has run into problems with that piece of hardware, and someone else may have already posted a solution. Often, you’ll need to read the full thread to find an answer. Someone may start by asking the same question as you but, with the help and guidance of the forum members, they might find a solution, which they then post several messages later. In addition, some individuals write their own HOWTO guides when they figure out how to do something. These are normally contained in the Faqs, Howto, Tips & Tricks forum, under the Other Support Categories heading. If you’re unable to find a solution by searching, then consider posting your own question. Keep your question simple, clear, and concise, because no one likes reading through acres of text. If possible, provide as many details about your system as you can. You will almost certainly want to provide the version number of the Linux kernel you’re using, for example. You can find this version number by typing the following in a GNOME Terminal window: uname -sr In addition, any other details you can provide may prove handy. You definitely should mention the version of Ubuntu you’re using, which is Edgy Eft (often referred to simply as “Edgy”). If you’re asking about hardware, give its entire model name and/or number. Don’t just ask for help with a Foomatic scanner. Ask for help with a Foomatic D1000 scanner, model number ADK1033, Revision 2. If you’re asking about a piece of software, provide its version number (click Help ➤ About). Sometimes in their replies, other forum members may ask you to post further details or to provide log files. If you don’t understand the question, simply ask the poster to give you more details and, if necessary, instructions on what to do. Just be polite. Explain that you’re a newbie. If you think the question is extremely obvious, then say so—apologize for asking what may be a stupid question, but explain that you’ve tried hard to answer it yourself but have failed. Don’t forget that the Ubuntu forums include the Absolute Beginner Talk forum, where fundamental questions are asked all the time.
- 714. 678 APPENDIX C ■ GETTING FURTHER HELP Mailing Lists Using the forum’s search function also has the advantage of searching the archives of the mailing lists. Mailing lists have a number of advantages and disadvantages. The advantages are that a mailing list provides an excellent way to learn about Ubuntu. All you have to do is read through the e-mail messages you receive in order to partake of a constant information drip-feed. In addition, some mailing lists are designed to make public announcements, so you’ll find it easy to learn about the latest happenings in the Ubuntu community. Mailing lists also have a terrific sense of community. They offer a neat way of getting to know other Ubuntu users and talking to them. E-mails often drift off topic into humor and general discussion. The disadvantages of mailing lists are that you can easily receive in excess of 200 messages a day, depending on which mailing list you join. Even if you have a moderately fast Internet connection, that quantity of messages can take a long time to download. In addition, you’ll need to sort out any personal or business e-mail from the enormous quantity of mailing list traffic (although the mailing list messages usually have the list title in square brackets in the subject field; you can therefore create a mail rule that sorts the mail according to this). You can sign up to the Ubuntu mailing lists at https://lists.ubuntu.com/mailman/ listinfo/ubuntu-users. Other Official Sites The Ubuntu Document Storage Facility (http://doc.gwos.org/index.php/Main_Page) is a guide put together by the individuals who maintain the Ubuntu forums. It contains a lot of information culled from the forums, not least of which is the Hardware Compatibility Guide. This lists hardware that is known to work with Ubuntu, or at least hardware that can be made to work with Ubuntu with a little effort, which often is also detailed. The official Ubuntu web site contains a Documentation section that features FAQs and a glossary of terms. It's located at www.ubuntu.com/support/documentation. In addition, you might want to take a look at the Ubuntu wiki: https://wiki.ubuntu.com. This contains a whole world of fascinating information about Ubuntu, but can be somewhat difficult to navigate and tends to aimed at higher-level Ubuntu users, such as developers.
- 715. A PPEN DI X C ■ GET T ING FURT H ER H ELP 679 Third-Party Sites Of course, the Ubuntu project doesn’t have a monopoly on sites that discuss Ubuntu. Several third-party web sites are worth at least an occasional visit, and other forum web sites are devoted to Linux. One we visit on a regular basis is the Ubuntu blog: http://ubuntu.wordpress.com. This is written by a relative newcomer to Ubuntu who has chosen the Ubuntu distribution for his computer. It details discoveries that Carthik Sharma has made about Ubuntu, such as configuration options, online sources of software, how to overcome hardware issues, and so on. In addition, we like to visit http://linuxhelp.blogspot.com, which is a similar blog written by a Linux user who uses Ubuntu and likes to share tips and techniques. Perhaps the king of third-party Ubuntu sites is Ubuntu Guide: http://ubuntuguide.org. This contains brief instructions on how to do a variety of common tasks under Ubuntu, such as installing certain types of software or administering particular hardware. It covers a lot of the same ground as this book, but is still worth investigating if you wish to browse through some excellent tips and advice. Finally, one of the best Linux forums and general advice sites can be found at www. linuxquestions.org. This has a forum dedicated specifically to Ubuntu, but also contains hundreds more devoted to just about every aspect of Linux, including forums for beginners.
- 717. APPENDIX D ■■■ Exploring the DVD-ROM and Other Ubuntu Versions T he DVD-ROM supplied with this book is double-sided. Side A contains the current Ubuntu release, 8.04. Side B contains the sister versions of Ubuntu that use different desktop environments, including Kubuntu, Xubuntu, and Edubuntu. It also has alterna- tive versions of the main Ubuntu release for the PowerPC and 64-bit x86 platforms. This appendix provides details about each of the Ubuntu derivations, along with instructions on how to utilize them. Version Numbers, Code Names, and Support Each version of Ubuntu has a version number and also a code name. The version number is simply the year of release, followed by the month. The release made in June 2006 has the version number 6.06, for example. If an updated release is made after this, numbers are added to the end. For example, the first update to the 6.06 release is numbered 6.06.1. The code name is how Ubuntu is referred to informally, especially among community members, and is set by Mark Shuttleworth, the creator of Ubuntu. Code names tend to involve animals and are usually humorous. The 6.06 version of Ubuntu is code-named Dapper Drake, for example. The latest 8.04 release is code-named Hardy Heron. People often just use the first word of the code name, especially on Internet forums. For example, the 8.04 release is often referred to as Hardy. This book was written using version 8.04 as a base. This version was released in April 2008. It was the most recent version at the time of this writing. Mark Shuttleworth has announced plans for the 8.10 release, which is code-named Intrepid Ibex. Each successive version of Ubuntu brings improvements, such as newer versions of software packages. However, not all versions of Ubuntu are created equal when it comes to online updates, as provided by the Update Manager program. All versions of Ubuntu come with free software updates for a set period, usually 18 months, after which users are expected to upgrade (for free) to the most recent version at that time. 681
- 718. 682 APPENDIX D ■ EXPLORING THE DVD-ROM AN D OTHE R UBUNTU VERS IONS However, the 8.04 release included with this book and the 6.06 release from a few years ago also have the epithet LTS, which stands for Long Term Support. The freely available software updates for 8.04 will last until 2011, some three years after the initial release. The 6.06 release is supported until 2009. ■Note If you use the Ubuntu 8.04 or 6.06 release on a server system, support will last for five years. The intention behind the 8.04 and 6.06 releases is that they should be used by those who want a proven and stable Linux operating system, and don’t care about newer features in the latest releases of Ubuntu. For example, in a corporate environment, some of the new features provided in more recent versions of Ubuntu might require additional staff training, so an unchanging release may prove appealing. UPDATING TO A NEWER VERSION OF UBUNTU Ubuntu works to a six-month release cycle, and this means a new version of Ubuntu comes out every half year. By the time you read this, a new release of Ubuntu may be available, and you might choose to update to it (but be aware that it will have only 18 months of update support, and not the three years— up until 2011—provided with 8.04). You can update to a newer version of Ubuntu in two ways: by burning the ISO image to a CD or by upgrading online. You can download the ISO image of the latest release from www.ubuntu.com/getubuntu/ download and burn it to CD. Then insert the CD when Ubuntu is up and running. You’ll be asked if you want to upgrade to the latest version using the Synaptic Package Manager. This process is automated. Of course, you can then use the same CD to install Ubuntu afresh on any other computer. To upgrade online, open a terminal window (Applications ➤ Accessories ➤ Terminal), and type the following two lines, pressing Enter after each one: sudo apt-get update sudo apt-get dist-upgrade This will download all the packages for the latest release of Ubuntu, if one is available, and attempt to update your system. Updating in this way involves less downloading, because your computer will get only the packages it needs, although it’s still likely that several hundred megabytes will need to be downloaded.
- 719. A PPEND IX D ■ EXPLO RI NG T H E D VD-RO M A ND O TH ER U BUNT U VERS IO NS 683 Other Versions of Ubuntu In addition to the main Ubuntu releases, several Ubuntu derivations are available. You might refer to these as “spin-off projects.” They are created by taking the main Ubuntu release as a base and then adding software, usually in the form of an alternative desktop environment. Some support alternative hardware platforms but are otherwise identical to the main release. We have included all the major derivations of the 8.04 release of Ubuntu, as listed in Table D-1, on Side B of the DVD-ROM. Here, we describe how to install other versions, and then provide some details about the Kubuntu, Xubuntu, and Edubuntu versions. Table D-1. Ubuntu Derivations on Side B of the DVD-ROM Ubuntu Derivation ISO Image Filename Description Kubuntu kubuntu-kde4-8.04- Same as the main Ubuntu release, except desktop-i386.iso that it uses the KDE 4 desktop Xubuntu xubuntu-8.04-desktop- Same as the main Ubuntu release, except i386.iso that it uses the Xfce desktop Edubuntu edubuntu-8.04-addon- Same as the main Ubuntu release but with i386.iso a child-friendly interface along with the addition of some educational software Ubuntu alternate ubuntu-8.04-alternate- Same as the standard release of Ubuntu installer i386.iso but employs a text-mode installer that can help bypass some graphical problemsa Ubuntu x86-64 ubuntu-8.04-desktop- Same as the main Ubuntu release but com- amd64.iso piled for computers with 64-bit processors b Ubuntu PowerPC ubuntu-8.04-desktop- Same as the main Ubuntu release but powerpc.iso compiled for computers with PowerPC processors, such as G3, G4, or G5 chips c Ubuntu main release ubuntu-8.04-desktop- The CD release of Ubuntu 8.04, included i386.iso so that you can create copies of Ubuntu for friends or colleagues d aThe DVD release of Ubuntu included on Side A of the DVD also features an option to use the text-mode installer. This alternate install ISO image is included so you can create CD copies of Ubuntu that feature the text-mode installer. bAs the filename suggests, this release will work only on 64-bit chips that support the AMD64 or EM64T/Intel 64 extensions. Intel’s Itanium (IA-64) chips are not supported, although a community-supported Itanium release can be downloaded from http://cdimage.ubuntu.com/ports/releases/8.04/release/. cThe PowerPC release of Ubuntu is not officially supported. Updates are provided by its community of users. However, the older 6.06 release of Ubuntu is still officially supported until 2009, and can be downloaded from http://releases.ubuntu.com/6.06/. dBecauseUbuntu is open-source software, you can create copies of both the DVD that came with this book and any of these CD ISO images for whomever you wish. In fact, this is encouraged by both Canonical, the company behind Ubuntu, and Apress, the company that published this book.
- 720. 684 APPENDIX D ■ EXPLORING THE DVD-ROM AN D OTHE R UBUNTU VERS IONS Installation of Other Versions All of the other Ubuntu versions on Side B of the DVD-ROM are in the form of ISO images. These are single files that contain the entire contents of the bootable installation CDs. They’re designed to be burned to blank CD-R or CD-RW discs. ■Note If you want to use the alternative hardware versions of Ubuntu, you should create your own CD and use it to install Ubuntu. If you want to install Kubuntu, Edubuntu, or Xubuntu, you have two choices: • Start fresh, by burning a CD from the ISO image and installing from it. To learn how to do this on most major operating systems, see the “Creating Bootable CDs from ISO Images” section later in this appendix. See Table D-1 for the filename of the ISO image for each version. • Upgrade from an existing installation using the Synaptic Package Manager. The DVD-ROM version of Ubuntu supplied with this book includes all the Kubuntu, Xubuntu, and Edubuntu packages, making it easy to upgrade to them using the Synaptic Package Manager. However, you will need to add the DVD-ROM as an installation source. To do so, follow these steps: 1. Start Software Sources (System ➤ Administration ➤ Software Sources). 2. Select the Ubuntu Software tab and make sure a check is in the box alongside Cdrom with Ubuntu 8.04. Click the Close button. 3. A dialog box will appear, stating that you need to reload the information about available software. Make sure that the Ubuntu DVD-ROM is in the drive, and then choose to reload. To install each version alongside the current desktop, you’ll need to search for and install a particular metapackage using the Synaptic Package Manager (see Chapter 28 for details on using the Synaptic Package Manager):
- 721. A PPEND IX D ■ EXPLO RI NG T H E D VD-RO M A ND O TH ER U BUNT U VERS IO NS 685 • For the main Kubuntu release, install the kubuntu-desktop package. To install the newer KDE 4 release of Kubuntu, search for kubuntu-kde4-desktop. The following section describes the differences between these releases. During installation of Kubuntu, you will be prompted for which login manager you wish to use. It’s a good idea to stick with gdm (GNOME Display Manager), which is the default choice. • For Edubuntu, choose to install the edubuntu-desktop package. There are two versions of Edubuntu: the default based on the GNOME desktop and another based on the Kubuntu desktop. You can choose either from the list of results in the Synaptic Package Manager. • For Xubuntu, install xubuntu-desktop. This is a metapackage that ensures all the Xfce desktop components are installed alongside the current desktop environment. Kubuntu The standard Ubuntu release, as supplied with this book, relies on the GNOME Desktop Project for its graphical interface (see www.gnome.org). Many other desktop projects exist in the wider Linux world, but perhaps the only one that ranks alongside GNOME in terms of popularity is the K Desktop Environment project (www.kde.org), usually referred to as KDE. Kubuntu is simply a version of Ubuntu that eschews GNOME in favor of KDE. Kubuntu (www.kubuntu.org) retains the same philosophy as Ubuntu, in both its humanitarian aims of being available to all, as well as its more pragmatic aspects, such as always including the latest versions of applications. It also shares many technical features, such as the use of sudo to invoke superuser powers. ■Note Rather than use gksu to invoke sudo powers for graphical applications, Kubuntu uses kdesu. It’s used in the same way, however. The main difference is the software bundled with this variant. When it comes to e-mail, KDE’s KMail program is used instead of Evolution, for example, and Konqueror is used for web browsing instead of Firefox (although, of course, Evolution and Firefox can easily be installed via the Synaptic Package Manager after Kubuntu has been installed). Additionally, the Dolphin file manager is used instead of Nautilus. The system configuration software is radically different, too, with several KDE tools used instead of the GNOME software described in this book.
- 722. 686 APPENDIX D ■ EXPLORING THE DVD-ROM AN D OTHE R UBUNTU VERS IONS With the 8.04 release of Kubuntu, two separate versions of Kubuntu were simultaneously released. One uses the established version 3.5.9 of the software; the other uses the newer version 4 software. Version 4 of KDE radically redesigns the system software, as well as the look and feel. However, it is considered a work in progress, which is why the Kubuntu project has used the 3.5.9 version for its main release. The ISO image on Side B of the DVD-ROM provided with this book is of version 4. For more information about KDE version 4, see the Wikipedia article at http://en.wikipedia.org/wiki/KDE_4. Figures D-1 and D-2 show the different Kubuntu versions. Figure D-1. Kubuntu 8.04 main release, utilizing KDE 3.5.9 Once the Kubuntu components have been installed, as described in the previous section, you can opt to boot into Kubuntu by clicking the Options button on the login screen and clicking the Select Session entry. Then select the KDE entry from the list (or KDE 4 if you installed that version) and click the Change Session button. To boot to the standard Ubuntu desktop after this, simply repeat these steps and select GNOME from the list.
- 723. A PPEND IX D ■ EXPLO RI NG T H E D VD-RO M A ND O TH ER U BUNT U VERS IO NS 687 Figure D-2. Kubuntu 8.04 featuring the KDE 4 desktop. Edubuntu The Ubuntu philosophy is to make an operating system accessible to everyone, no matter who they are or where they live in the world. Of course, young people are included in this vision, and Edubuntu (www.edubuntu.org) is a version of Ubuntu specifically geared toward their needs. It’s a rendition of the standard Ubuntu release that has been bolstered by many educational software titles. In addition, it has a friendlier and simpler interface that’s designed to appeal to youngsters, although it still utilizes the same desktop environ- ment as the main Ubuntu release. Actually, two versions are available: one that uses the same GNOME desktop as the main release, as shown in Figure D-3, and another that is built on the KDE desktop of Kubuntu. Edubuntu also features software from the Linux Terminal Server Project (www.ltsp.org). This brings the potential for computers without a hard disk to boot Edubuntu from a central server. The intention is to give older computers (unfortunately, the type typically found in educational environments) a new lease on life, even if they’re too underpowered to run modern software. Additionally, the terminal server can be used to administer the computers, which is clearly beneficial in a teaching environment. For information on how to set up a Linux Terminal Server Project system, see https://help.ubuntu.com/community/ LTSPServerSetup.
- 724. 688 APPENDIX D ■ EXPLORING THE DVD-ROM AN D OTHE R UBUNTU VERS IONS Figure D-3. Edubuntu 8.03 (GNOME desktop version) However, the standard installation of Edubuntu is just like any other Ubuntu configu- ration, and the software is designed to be installed directly on the hard disk of computers. The following are the chief education titles provided with Edubuntu: • KDE Edu programs (http://edu.kde.org) include games involving mathematics, languages, science, and other miscellaneous topics. Teachers might also appreciate the inclusion of KEduca, a program designed to create form-based tests and exams. • GCompris (http://gcompris.net) is for children of kindergarten age and introduces them to computer use as well as elementary math and reading skills. • Tux Paint (www.tuxpaint.org) is a user-friendly drawing package full of sound effects and colorful graphics. • SchoolTool Calendar (www.schooltool.org/products/schooltool-calendar) is a calendar and time table application built specifically for school environments. To access SchoolTool, open a browser window, type localhost:7080 into the address bar, and press Enter.
- 725. A PPEND IX D ■ EXPLO RI NG T H E D VD-RO M A ND O TH ER U BUNT U VERS IO NS 689 The main benefit of Edubuntu for educational establishments is that it’s both free of charge and comes with the same kind of update support as Ubuntu. As with Ubuntu, although newer releases will become available, the 8.04 release is officially supported with updates until 2011. This provides a consistent experience for students and teachers alike. Because Edubuntu is built on the Ubuntu base, there is no way to “switch between” Edubuntu and Ubuntu. Effectively, Edubuntu is a reconfiguration of Ubuntu with the addition of some educational software and a more kid-friendly theme. To return to a stan- dard Ubuntu setup and deactivate the Edubuntu theme, simply select the Human entry from the Theme chooser list. See Chapter 10 for more details on how to switch themes. Xubuntu While GNOME and KDE dominate the desktop interface landscape of Linux and are used in the main Ubuntu and Kubuntu releases, respectively, other projects take a different approach to the graphical desktop. The Xfce Desktop Environment (www.xfce.org) is one of these. It’s a streamlined desktop that retains the good looks of GNOME but is much smaller in terms of memory footprint. This means that a system running Xfce is faster than an equivalent GNOME system. It also means that Xfce can be used on many older computers that don’t have the powerful hardware we take for granted nowadays and would struggle with the latest GNOME and KDE releases of Ubuntu. Because a key component of the Ubuntu Foundation’s philosophy is to create an oper- ating system that can be used by everyone, regardless of where they are in the world, a version of Ubuntu that can run on older hardware makes a lot of sense. It’s unlikely that less developed countries will have access to the latest expensive computer hardware, for example. As you might expect, Xubuntu (www.xubuntu.org) is simply a version of Ubuntu that replaces the GNOME desktop with the Xfce desktop, as shown in Figure D-4. Some key components are still present, such as the Firefox web browser. Other Ubuntu components are swapped for Xfce replacements; for example, the Nautilus file browser is replaced with Thunar. Despite Xfce’s claim to be lightweight, it still offers a high degree of usability and shouldn’t be seen as a second-best choice for stripped-down hardware. It’s certainly worth trying out if you long for a less cluttered desktop experience. It also uses many modern GUI aspects we take for granted, such as theming (see Chapter 10) and font antialiasing. To use the Xfce desktop once it’s installed, click the Options button on the login screen and then click the Select Session entry. Next, select Xfce from the list and click the Change Session button. To boot to the standard Ubuntu desktop after this, simply repeat the steps and select GNOME from the list.
- 726. 690 APPENDIX D ■ EXPLORING THE DVD-ROM AN D OTHE R UBUNTU VERS IONS Figure D-4. Xubuntu 8.04 Creating Bootable CDs from ISO Images The Ubuntu derivatives are supplied on Side B of the DVD-ROM disc as ISO images. It should be obvious from the individual filenames what each ISO file contains, but you can also consult Table D-1. ISO images are designed to be burned to blank CD-R or CD-RW discs that you boot from in order to install the operating system, just as you booted from Side A of this disc to install Ubuntu. Alternatively, you can use an ISO image to install the operating system on virtual machines. Of course, to burn ISO images to CD, you’ll need a CD or DVD drive capable of burning discs. These have been available for many years and are standard features on nearly all desktop and notebook computers. You’ll also need a blank CD-R or CD-RW disc and perhaps one or two spares in case your first attempt doesn’t work. If you opt to use CD- RW discs, these should be blanked prior to use. This can be done with most CD-burning software.
- 727. A PPEND IX D ■ EXPLO RI NG T H E D VD-RO M A ND O TH ER U BUNT U VERS IO NS 691 A few rules should be followed whenever burning ISO images: • Copy the ISO image to your computer’s hard disk. Don’t try to burn an ISO image directly from a DVD/CD or a network share. The burning software requires quick access to the ISO file, and this isn’t possible when it’s not on your hard disk. • Always burn at the slowest speed possible, even if your CD/DVD burner is capable of much faster speeds. For some reason, ISO images burned quickly onto discs often fail to work. Even worse, sometimes the discs appear to work until it becomes apparent that one particular file is corrupted and the installation halts. • It’s not a good idea to use your computer for heavy tasks while burning ISO images. You should refrain from game playing or video editing, although light computer use should be fine (that is, word processing, web browsing, and so on). The instructions in the following sections describe how to burn ISO images to CDs using Ubuntu, Windows, and Mac OS X. DECODING ISO FILENAMES ISO filenames for Linux distributions can be a little hard to understand, so here’s a quick guide. Let’s take the Xubuntu 8.04 ISO filename as a guide. Here it is: xubuntu-8.04-desktop-i386.iso This filename consists of four main parts: • The first part is the name of the distribution. In this case, it’s xubuntu, but this could read edubuntu or just ubuntu, for example. • The second part is the version number of the distribution—8.04. • The third part is the platform for which the distribution is designed. In this case, this version of Xubuntu is designed for the desktop, but this could read server or alternate, to indicate an alternate install disc. • The final part, before the .iso file extension, is a description of the computer architecture for which the distribution is made. i386 means the distribution will run on all 32-bit PCs (which is to say, every computer made since around 1990). You might also see amd64 here, which means the distri- bution is designed to work on 64-bit processors, such as recent Intel Pentium 4 and AMD Athlon 64–based computers. If you see PowerPC here, it means the distribution is designed to run on PowerPC-based computers, primarily older Apple Macintoshes. ia64 means the distribution is designed to run on computers with Intel’s Itanium CPUs.
- 728. 692 APPENDIX D ■ EXPLORING THE DVD-ROM AN D OTHE R UBUNTU VERS IONS Burning CDs Using Ubuntu Here are the steps for burning CDs from ISO images using Ubuntu: 1. Copy the ISO image to the desktop. 2. Right-click the image on the desktop and select Write to Disc from the menu that appears. 3. A new dialog box appears. In the Write Speed drop-down list, select the lowest value possible. If you have more than one CD/DVD writer drive installed on your computer, ensure the correct model is selected from the Write Disc To list, too. 4. Insert a blank CD-R or CD-RW. 5. Click the Write button to create the CD. Burning CDs Using Windows Vista/XP Unlike Ubuntu and Mac OS X, Windows Vista and XP don’t contain any built-in ISO burning software. For the purpose of burning ISO images, we recommend that you download and install the freeware ISO Recorder tool from http://isorecorder.alexfeinman.com/ isorecorder.htm. Versions are available for both Windows XP and Vista. The following are the steps for burning CDs from ISO images using the Windows XP version of ISO Recorder: 1. Copy the ISO file to your desktop. 2. Insert a blank CD-R or CD-RW disc into your drive. 3. Right-click the .iso file on the desktop, select Open With, and then select ISO Recorder from the list. 4. The ISO Recorder program window opens. Click the Properties button. 5. Click and drag the recording speed slider so that the middle number under the slider is 1 (or to the lowest possible number if 1 isn’t available). Click OK in the Properties dialog box. 6. Click the Next button in the main ISO Recorder program window. This will start the burning procedure, which might take some time, during which you should avoid using your PC.
- 729. A PPEND IX D ■ EXPLO RI NG T H E D VD-RO M A ND O TH ER U BUNT U VERS IO NS 693 Burning CDs Using Mac OS X Here are the steps for burning CDs from ISO images using a Mac OS X system: 1. Copy the ISO file to the desktop. 2. Insert a blank CD-R or CD-RW disc. 3. In Finder, click Applications ➤ Utilities ➤ Disk Utility. 4. When the program starts, click Images ➤ Burn. 5. Navigate to the ISO file on the desktop, and then click the Burn button in the dialog box that appears.
- 731. Index ■Special characters $ (dollar symbol), 309 --- (three dashes), 329 $ alias command, BASH, 658 # (hash), 309 $ alsamixer command, BASH, 658 # apt-get command, BASH, 658 $ apropos command, BASH, 658 # cdrecord * command, BASH, 659 $ apt-cache command, BASH, 658 # cfdisk * command, BASH, 659 $ bzip2 command, BASH, 659 # chgrp command, BASH, 659 $ bzip2recover command, BASH, 659 # chroot command, BASH, 660 $ cal command, BASH, 659 # chvt command, BASH, 660 $ cat command, BASH, 659 # dosfsck * command, BASH, 660 $ cd command, BASH, 659 # dpkg command, BASH, 661 $ cdparanoia * command, BASH, 659 # dpkg-reconfigure command, BASH, 661 $ chmod command, BASH, 659 # fdisk * command, BASH, 661 $ chown command, BASH, 659 # fsck * command, BASH, 662 $ clear command, BASH, 660 # groupadd command, BASH, 662 $ command, vim command mode, 353 # groupdel command, BASH, 662 $ cp command, BASH, 660 # halt command, BASH, 662 $ crontab command, BASH, 660 # hdparm * command, BASH, 662 $ date command, BASH, 660 # ifconfig * command, BASH, 663 $ df command, BASH, 660 # init command, BASH, 663 $ diff command, BASH, 660 # lsmod command, BASH, 664 $ diff3 command, BASH, 660 # mkfs * command, BASH, 664 $ dig command, BASH, 660 # modinfo command, BASH, 665 $ dmesg command, BASH, 660 # modprobe command, BASH, 665 $ du command, BASH, 661 # mount * command, BASH, 665 $ eject command, BASH, 661 # reboot command, BASH, 666 $ ex * command, BASH, 661 # rmmod command, BASH, 666 $ exit command, BASH, 661 # route * command, BASH, 666 $ fdformat command, BASH, 661 # runlevel command, BASH, 666 $ fg command, BASH, 661 # tracepath command, BASH, 668 $ file command, BASH, 661 # umount command, BASH, 668 $ find * command, BASH, 661 # useradd command, BASH, 668 $ free command, BASH, 662 # userdel command, BASH, 668 $ ftp * command, BASH, 662 695
- 732. 696 ■I N D E X $ fuser command, BASH, 662 $ shred command, BASH, 667 $ grep * command, BASH, 662 $ sleep command, BASH, 667 $ groups command, BASH, 662 $ smbclient * command, BASH, 667 $ gzip command, BASH, 662 $ sort command, BASH, 667 $ head command, BASH, 662 $ ssh * command, BASH, 667 $ help command, BASH, 662 $ startx command, BASH, 667 $ history command, BASH, 662 $ su command, BASH, 667 $ host command, BASH, 663 $ sudo command, BASH, 667 $ hostname command, BASH, 663 $ tac command, BASH, 667 $ id command, BASH, 663 $ tail command, BASH, 667 $ info * command, BASH, 663 $ tar * command, BASH, 667 $ jobs command, BASH, 663 $ tee command, BASH, 668 $ kill command, BASH, 663 $ top * command, BASH, 668 $ killall command, BASH, 663 $ touch command, BASH, 668 $ last command, BASH, 663 $ umask command, BASH, 668 $ ldd command, BASH, 663 $ unalias command, BASH, 668 $ less command, BASH, 663 $ uname command, BASH, 668 $ ln command, BASH, 664 $ unzip command, BASH, 668 $ lpr command, BASH, 664 $ uptime command, BASH, 668 $ lpstat command, BASH, 664 $ vi * command, BASH, 668 $ ls command, BASH, 664 $ wc command, BASH, 668 $ lsof command, BASH, 664 $ whatis command, BASH, 668 $ man command, BASH, 664 $ whereis command, BASH, 668 $ md5sum command, BASH, 664 $ xhost command, BASH, 669 $ mkisofs * command, BASH, 665 $ xinit command, BASH, 669 $ more command, BASH, 665 $ zip command, BASH, 669 $ mv command, BASH, 665 $ zipgrep command, BASH, 669 $ netstat * command, BASH, 665 $PATH variable, 377 $ nice command, BASH, 665 %CPU column, top program, 367 $ nohup command, BASH, 665 %MEM column, top program, 367 $ passwd command, BASH, 666 & (ampersand symbol), 373 $ ping command, BASH, 666 * (asterisk), 358, 675 $ printenv command, BASH, 666 _ (underscore) character, 280 $ ps * command, BASH, 666 | (pipe symbol), 362, 383 $ pwd command, BASH, 666 ~ (tilde), 615 $ renice command, BASH, 666 (+) read/write (rw) permissions, 331 $ rm command, BASH, 666 < (left angle bracket), 361 $ screen * command, BASH, 666 = (equal sign), in Calc, 491 $ sftp * command, BASH, 666 > (right angle bracket), 361, 385
- 733. ■I N D E X 697 0 (zero) value, 586 Advanced Access Content System (backslash), 279 (AACS), 392 ! (exclamation mark), 382, 527, 625 Advanced Package Tool. See APT / (forward slash), 279, 673 Advanced tab, 579 . (period), 599 age of Linux, 5–6 ? (question mark), 348 Airbrush tool, GIMP, 438 alien program, 118 ■Numerics Alignment tool, GIMP, 438 3D drivers, installing, 160–163 all day events, 538 3D effects, 507–509 Alpha to Logo filters, GIMP, 448 3D flourish tool, 507 Alt+D shortcut, BASH, 380 ■A Alt+L shortcut, BASH, 380 a command option, 362, 600 Alt+R shortcut, BASH, 380 A command, vim command mode, 353 Alt+T shortcut, BASH, 380 AACS (Advanced Access Content Altering Permissions section, 328 System), 392 ampersand symbol (&), 373 AbiWord word processor, 563 anacron, 616–617 acceleration, 234 animating slides, 504–506 Access, Microsoft, 264 animation accessibility settings, 235–236 custom, 504, 506 keyboard, 238–239 Flash, 425 login options, 243 animation filters, GIMP, 448 mouse, 235–236 antialiasing, 222 OpenOffice.org, 471 antivirus protection, 175 accessibility tools, 245 AppArmor, 199 accessing computers remotely. See remote Appearance option, OpenOffice.org, 470 access to computers Apple's Boot Camp utility, 73 accessing files, 281–283 applets, 251–252 Account tab, 579 Application category, OpenOffice.org, 466 Add Directory button, 603 Application Switcher, 228 Add File button, 603 applications. See programs Add to Panel option, 252 Applications menu, 102, 110, 250, 257 Add Wallpaper button, 221 Applications option, Finder, 109 Add/Remove Applications window, 558 APT (Advanced Package Tool), 550, 597 Address Book Search applet, 253 installing and removing packages using, Address Cards view, Contacts mode, 561–563 Evolution, 535 overview, 561 admin system group, 582 querying packages and repositories, administrator account, 99 563–565 administrator powers, 122 updating system, 564–565
- 734. 698 ■I N D E X apt-cache depends packagename |less backing up data command, 563 choosing data to back up, 599–601 apt-cache search packagename from command line command, 563 compressing tar archives, 607–608 apt-cache show packagename |less creating tar files, 606–607 command, 563 extracting files from tar archive, 608 apt-get command, 569 overview, 606 apt-get command, APT, 561 saving file to CD-R/RW, 609–611 Archive Manager, 273–274 viewing tar archive information, 608 Artistic filters, GIMP, 447 e-mail, 38–39 As Character option, Writer, 483 making notes, 39–40 Aspell dictionary package, 529 overview, 37–38, 599 Assistive Technology Support, 245 using Simple Backup asterisk (*), 675 changing backup file destination, 604 Asterisk Password Reveal, 39 changing time period between at command, 618 backups, 605 atq job number, 618 excluding files and folders, 603 Audacity software, 409 including files and folders, 603 audio. See digital audio overview, 601–603 Authentication tab, 567 restoring data via Simple Backup, AutoCaption option, OpenOffice.org 605–606 Writer, 472 Backports repository, 552 autocompletion, BASH shell backslash (), 279 with files and paths, 378 Backup Properties dialog box, 601 overview, 377 bang, 382 viewing available options, 378–379 Base program, 264 autohinting, 223 creating database automatic login, 587–588 adding controls to form manually, 518 Automatic Private IP Addressing, 126 adding table, 514–515 Automatic Proxy Configuration, 144 creating form, 516–517 Automatically Fix File System Errors editing database table, 518 setting, 46 overview, 514 Available Backups drop-down list, 605 getting started with, 512–513 ■B overview, 511 b command, vim command mode, 353 using database, 519 ba commands, 378 BASH shell, 314–316 background (bottom) color box, 439 autocompletion Background option, OpenOffice.org with files and paths, 378 Writer/Web, 472 overview, 377 viewing available options, 378–379
- 735. ■I N D E X 699 command history, 381–382 bin directory, 335 command index, 657–669 binary files, 546 commands, 365 binary value, 264 getting help, 310–311 BIOS menu, 49 keyboard shortcuts BitTorrent file sharing application, 203 overview, 379 Bksp key, GNOME Calculator, 273 for system control, 380–381 Bluetooth for working in BASH, 379–380 Manager program, 589 listing files, 314–316 overview, 163 moving files, 316–317 pairing Bluetooth devices, 163 overview, 303–305, 307–309, 377 transferring files between Bluetooth piping and directing output devices, 164–165 of commands, 383–385 USB adapters, 163 overview, 383 using Bluetooth keyboard or mouse, 166 redirecting output, 385–386 Blur filters, GIMP, 446 reasons for using, 305–306 Blur/sharpen tool, GIMP, 439 running programs, 309–310 bonding, 163 running via virtual console, 311–312 Boolean value, 264 when to use, 307 Boot Camp utility, 73 working with files boot directory, 335 changing and creating directories, Boot from first hard disk option, Boot 319–320 menu, 52 copying files, 316 boot loader menu, 97 deleting files, 318–319 boot loaders, 33, 99 listing files, 314–316 boot sectors, 33 moving files, 316–317 bootable CDs, creating from ISO images, 690–693 BASIC category, OpenOffice.org, 466 /boot/grub/menu.lst file, 586 Basic Fonts (Western) option, OpenOffice.org Writer, 471 booting Battery Charge Monitor applet, 253 automatic login, 587–588 BBC (British Broadcasting Corporation), from CD-ROM, 48–49 402, 422 freeing disk space benefits of Linux emptying cache of package files, 597 fewer crashes, 8 emptying /tmp folder, 596 free and shareable, 9 overview, 596 Linux community, 9–10 removing unused software, 597 no annoying copy protection or usage managing GNOME session, 589–591 restrictions, 9 overview, 8 security, 8–9
- 736. 700 ■I N D E X prelinking working with formulas configuring prelinking, 594 overview, 493 deactivating prelinking, 594–595 summing figures, 494 overview, 593–594 using Function Wizard, 493–494 reducing boot menu delay, 586–587 Calculate option, OpenOffice.org Calc, 472 using mouse, 113 Calculator, 258, 273 Borders icon, Writer, 485 Calendar view, Evolution, 266 borders of windows, customizing, 216 Calendars mode, Evolution, 523 bounce keys, 239 adding or editing diary entry, 538–540 Bourne Again SHell. See BASH shell overview, 537 Brasero program, 270–271, 409–410 specifying appointment types, 537–538 Brightness applet, 253 cameras Brightness/Contrast menu option, 442 basic use information, 157–158 Bristol virtual synthesizer, 409 connecting to PC, 429–430 British Broadcasting Corporation (BBC), card readers, 157 402, 422 cat command, 347–348, 385 browser dialog box, GIMP, 435 cataloging images. See downloading and Bucket tool, GIMP, 438 cataloging images buffers, GIMP, 440 Category drop-down list, Calc, 493 bug fixing, 118 CD (compact disc) player, 258 build-essential metapackage, 569 cd command, 382, 625 BulletProofX system component, 85 cdrecord command, 386, 609 burning CDs, 692–693 cdrom -> media/cdrom directory, 335 By Company view, Contacts mode, CD-ROM, booting from, 48–49 Evolution, 535 cdrom system group, 582 Bytecode Interpreting, 223 CD-R/RW drive, 119, 609–611 .bzip2 files, 273 CDs (compact discs) bzip2 program, 607 audio, listening to, 404 ■C bootable, creating from ISO images, 690–693 c command option, 606 burning, 258, 270–271 cache of package files, emptying, 597 checking for defects, 51 Calc program, 261–262 creating own, 409–411 creating charts, 496–497 ripping music from deleting and inserting data and cells, 492 adding MP3-ripping support to Sound entering and formatting data, 491–492 Juicer, 407 overview, 491 choosing format, 406–407 sorting data, 495–496 overview, 405–406 using filters, 498 process, 408–409 cells, in Calc, 492
- 737. ■I N D E X 701 centered option, Style drop-down list, 221 command line central file server, 322 adding and deleting users at, 580–583 Change Icon, 467 backing up data from Changes option, OpenOffice.org Calc and compressing tar archives, 607–608 Writer, 472 creating tar files, 606–607 Character option, Writer, 480 extracting files from tar archive, 608 Character Palette applet, 253 overview, 606 charts, in Calc, 496–497 saving file to CD-R/RW, 609–611 Check CD for defects option, Boot menu, 51 viewing tar archive information, 608 Check for new hardware drivers tool, 590 configuring Ubuntu using, 122 child processes, 369 Command mode, vim text editor, 351–353 chkdsk command-line tool, 83 command prompts, 308 chmod command, 330–331 ! command, sftp, 625 chown command, 606 / command, vim command mode, 352 Cinelerra software suite, 425 ? command, vim command mode, 352 Clam Antivirus command-line mode, 354–355, 356 dealing with infections, 210–211 command-line prompts, 303 scanning for viruses, 209 command-line shell, 304, 305, 306, 334, updating database, 208 350, 357 clear command, 341 commands, piping and directing output of, Clearlooks theme, 214 383–385 Clipboard Text Encryption applet, 253 comma-separated value (CSV) files, 262, 456, 486 Clock applet, 253 community, Linux, 9–10 Clock notation option, 242 compact discs. See CDs clock, Ubuntu desktop, 106 compatibility Clone tool, GIMP, 439 OpenOffice.org, 455–457 codecs, 393, 414–416 OpenOffice.org Writer, 472 Color picker tool, GIMP, 437 compiling kernels, 595 colors Compiz Fusion, 161 color-coding within GNOME Terminal, 323 CompizConfig Settings Manager tool, 229, 230, 232 correcting, in GIMP, 442–444 Complain mode, AppArmor, 199 customizing, 216 composing e-mail messages, 528–529 of wallpaper, 222 Compressed file types, 290 Colors option, OpenOffice.org, 470 compressing tar archives, 607–608 Combine filters, GIMP, 447 Computer window, 298 COMMAND column, top program, 367 configuration dialog box, GIMP, 272 !command command, sftp, 625 configuration options, 469 command history, BASH shell, 381–382 configuration software, 24
- 738. 702 ■I N D E X configuration tools, 25 crashes, fewer with Linux, 8 configure script, 571 Create Form, Base, 516 configuring cron daemon, 613–615 display, 89–92 crontab command field, 617 Firestarter crontab file, 613–614 overview, 202–203 crontab/ file, 617 setting inbound rules, 203–204 cropping in GIMP, 438, 444 setting outbound rules, 205 cryptographic keys. See keys turning off diagnostic services, 206–207 CSS (Content Scrambling System), 392, 423 Ubuntu, Device Manager, 119, 121 CSV (comma-separated value) files, 262, Connect to Server applet, 253 456, 486 connecting camera to PC, 429–430 Ctrl+A shortcut, BASH, 380 Connections option, OpenOffice.org Ctrl+E shortcut, BASH, 380 Base, 473 Ctrl+K shortcut, BASH, 380 Contact List Editor pane, Evolution, 537 Ctrl+L shortcut, BASH, 380 Contacts manager/calendar, 258 Ctrl+left arrow shortcut, BASH, 380 Contacts mode, Evolution, 523 Ctrl+right arrow shortcut, BASH, 380 adding or editing contact information, Ctrl+T shortcut, BASH, 380 535–536 Ctrl+U shortcut, BASH, 380 creating contact list, 537 Ctrl+W shortcut, BASH, 380 overview, 535 Ctrl+Y shortcut, BASH, 380 Contacts view, Evolution, 266 cursor keys, 98, 351 Content Scrambling System (CSS), 392, 423 custom animation, 504, 506 context menu, in Writer, 480–481 Custom backup mode, Simple Backup, 602 Control Panel function, Windows, 108 Custom button, Synaptic Package Manager Controls category, OpenOffice.org, 467 toolbar, 554 controls, customizing, 216 Custom Filters button, 560 copy protection, 9 Customize dialog box, 467 copying cutting and pasting text, 114 files, BASH shell, 316 ■D Windows fonts, 458 D command, vim command mode, 352 copyleft, 17 Dapper Drake, 681 core fonts, 458 Data category, OpenOffice.org, 467 country, selecting during installation, 53–54 Database pane, Base, 513, 519 cp command, 316 databases. See Base cp program, 344 Databases option, OpenOffice.org Base, 473 cpio command, 606 date command, 341 CPU Frequency Scaling Monitor, 145, 253 db command, vim command mode, 352 cpufreq-selector applet, 145 dd command, vim command mode, 352
- 739. ■I N D E X 703 deactivating menus prelinking, 594–595 adding all menus to Panel, 249 spell-checking, 482 adding Applications menu to Panel, .deb file extensions, 547 249–250 .deb package files, 559 deleting, 250–251 Debian distribution, 26 overview, 249 Debian Package (dpkg), 549–550, 558–560 overview, 100, 246 Debian package maintainer, 676 personalizing panels, 248, 249 Debian package-management system, 569 visual effects, 160–163, 225–233 decoding ISO filenames, 691 widgets, 232–233 Decors filters, GIMP, 448 Desktop games, 259 decrypting e-mail, 195–196 Despeckle effect, GIMP, 446 DeCSS software, 423 Details button, Task Details dialog box, 541 Default Colors option, Chart, 473 /dev directory, 321, 335, 345 Default Face option, 245 dev= command option, 609 default mode, GNOME Calculator, 273 devel libraries, GTK+ 1.2, 570 default partitioning option, 56 /dev/hdd hard disk identifier, IDE, 59–65 default sleep mode, 148 Device Manager, 119, 121 Defragment Now button, 46 df command, 345 Delete key, Calc, 492 DHCP (Dynamic Host Control Protocol), 126 Delete This Panel, 248 dialout system group, 582 deleting dial-up telephone modems, 141–143 data and cells, in Calc, 492 Dictionary, 274–275 e-mail messages, 526 Dictionary Lookup applet, 253 files, BASH shell, 318 diff command, 361 menus, 250–251 diff3 command, 362 denial-of-service (DoS) attacks, 206 digital audio dependencies, 548–549, 557, 560, 570–571 creating own CDs, 409–411 Description heading, man page, 673 Internet telephone, 411–412 Deskbar applet, 253 online radio stations, 401–402 desktop podcasts, 402 adding shortcuts digital cameras. See cameras creating launcher, 247 digital images, 37 creating link, 248 digital photos overview, 246 downloading and cataloging images applets, 251–252 cataloging with F-Spot, 431 desktop elements, 105–107 connecting camera, 429–430 first impressions, 101–102, 105 importing photos using F-Spot, 430–431 overview, 429
- 740. 704 ■I N D E X tagging images using F-Spot, 433 DoS (denial-of-service) attacks, 206 tweaking photos using F-Spot, 431–432 DOS command prompt, 303 getting pictures onto PC, 430 dots per inch (DPI), 430 GIMP Double-Click Timeout setting, 235 cropping, 444 Download Package Files Only, 556 filters, applying, 446–448 downloading and cataloging images healing, 444 connecting camera, 429–430 making color corrections, 442–444 importing photos, 430–431 overview, 434–440, 442 overview, 429 sharpening, 445 tagging images, 433 overview, 429 tweaking photos, 431–432 Digital Rights Management (DRM), 392, 423 DPI (dots per inch), 430 Dillo programmer, 571 dpkg (Debian Package), 549–550, 558–560 Dillo web browser, 570 dpkg command, 560 dip system group, 582 dpkg -I packagename.i386.deb |less querying directing output. See piping and directing package, 561 output dpkg -l packagename querying package, 561 directories, 282, 319 dpkg -s packagename |less querying Disk Cleanup tool, 34 package, 561 Disk Management tool, 32 dpkg-reconfigure xorg-xserver command-line configuration Disk Mounter applet, 253 utility, 85 disk partitioning, 55 dragging-and-dropping, 235, 289 display, configuring, 89–92 Drawer applet, 253 displayconfig-gtk package, 86 Drawing category, OpenOffice.org, 467 Distorts filters, GIMP, 446 Drawing toolbar, 263, 464, 503, 507 distributions of Linux, 19 drive references, 279–280 distros, 19 driver file, 139 dmesg command, 341 drivers, proprietary vs. open source, 118–119 Do Backups drop-down list, Time tab, 605 DRM (Digital Rights Management), 392, 423 dock, 110 du command, 344 Document area, OpenOffice.org, 464 dual-boot setup, 31 Document protection, OpenOffice.org, 455 DVD burning, 258, 270–271 'document' search string, 361 DVD release of Ubuntu 8.04, 43 'document.' search string, 361 DVD supplied with this book 'document$' search string, 361 creating bootable CDs from ISO images, Documents category, OpenOffice.org, 466 690–693 documents, importing, 68 overview, 681 Dodge/Burn and dodge tool, GIMP, 439 version numbers, code names, and dollar symbol ($), 309 support, 681–682
- 741. ■I N D E X 705 versions of Ubuntu E-mail option, OpenOffice.org, 473 Edubuntu, 687–689 emblems, 287 installation of, 684–685 Emphasis option, Add button dialog box, 505 Kubuntu, 685–686 Enable Bidirectional Support box, 156 overview, 683 encryption Xubuntu, 689 decrypting files, 193 DVD-ROM drive, booting from, 48 of files, 190–192 dw command, vim command mode, 352 overview, 179–180 Dwell Click applet, 253 setting up for Dynamic Host Control Protocol (DHCP), 126 exporting public key, 185–186 generating key pair, 181–184 ■E importing and signing public key, Eastern Standard Time (EST), 53 188, 190 echo command, 309 overview, 180 Edge Detect filters, GIMP, 446 publishing public key, 186–187 Edit category, OpenOffice.org, 466 signing and encrypting e-mail, 194–196 Edit menu, Nautilus, 284 encryption key, 131, 621, 624 Edubuntu, 687–689 end-of-file (EOF), 381 Edutainment Suite, KDE, 688 End-User License Agreement (EULA), 18 Effect Options dialog box, 506 Enforce mode, AppArmor, 199 ejecting, 299–300, 341 Enhance filters, GIMP, 446 Ekiga, 277–278 entering data, in Calc, 491–492 Ellipse Select tool, GIMP, 436 Entrance option, Add button dialog box, 504 Emacs text editor, 350, 379 EOF (end-of-file), 381 e-mail. See also Evolution program equal sign (=), in Calc, 491 access, configuring, 169–171 Erase tool, GIMP, 438 backing up, 38–39 Escape key, Totem Movie Player, 269 composing messages, 528–529 ESSID (Extended Service Set Identifier), 129 creating new folders, 531 EST (Eastern Standard Time), 53 creating search folders, 533–534 etc directory, 335 creating signatures, 529–530 /etc/apt/sources.list file, 566, 568 decrypting, 195–196 /etc/apt/sources.list.d/ directory, 566 deleting messages, 526 /etc/hdparm.conf file, 149 flagging messages, 527 /etc/inittab file, 312 junk e-mail, 532 Ethernet network device, configuring, overview, 530 125–126, 128 reading, 526 EULA (End-User License Agreement), 18 sending and receiving, 524 Evolution Alarm Notifier tool, 590 signing and encrypting, 194–196 sorting and filtering messages, 532–535
- 742. 706 ■I N D E X Evolution program, 23, 169, 265–266 fields, Writer, 489 Calendars mode file browser window, 286, 295 adding or editing diary entry, 538–540 File Browsing function, Finder, 109 overview, 537 file command, 341 specifying appointment types, 537–538 file compatibility, OpenOffice.org, 455–457 Contacts mode File Format drop-down list, 264, 509 adding or editing contact information, file formats, OpenOffice.org, 476 535–536 file management creating contact list, 537 accessing removable storage devices, overview, 535 298–300 Mail mode accessing Windows files composing message, 528–529 accessing networked files, 294–296 creating e-mail signature, 529–530 overview, 291 creating new folders, 531 sharing folders from within Ubuntu, 297 Memos mode, 540 working with files in Windows modes, overview of, 521–523 partitions, 292–294 overview, 521 file system concepts steps to configure, 169 drive references, 279–280 Tasks mode, 540–541 file access and storage, 281–283 exclamation mark (!), 382, 527, 625 file names, 280 .exe files, 132, 137 overview, 279 Execute Actions drop-down list, launching files and running programs, Evolution, 532 289–291 exit command, 341, 625 overview, 279 Exit option, Add button dialog box, 505 using Nautilus Expand box option, 249 file and folder icons, 288 Exploit.IFrame.Gen-1, 211 overview, 283–286 exporting public key, 185–186 searching for files, 286 ext2 file system, 336 special windows, 288–289 ext3 file system, 336 file permissions, 326 Extended Service Set Identifier (ESSID), 129 file shortcuts, 332–333 Extract button, Archive Manager, 273 file system, 333–336 extracting files from tar archive, 608 File System Table (fstab), 337, 340 Eyes applet, 254 file type codes, 327 File Types tab, 603 ■F files. See also file management Failsafe GNOME option, 241 free space, 345–346 Failsafe Terminal option, 241 searching for, 342–343 fax system group, 582 Files heading, man page, 673 fdisk command, 339 fill screen option, Style drop-down list, 221
- 743. ■I N D E X 707 Filter function, Calc, 498 folders filtering e-mail messages, 532–535 in Evolution's Mail mode, creating, 531 filters search folders, in Evolution, 533–534 in Calc, 498 sharing from within Ubuntu, 297 in GIMP, 446–448 font preferences, 222–224 find command, 342 Font Preferences dialog box, 222 Find Files/ function, Windows, 108 Font Rendering heading, Font Preferences Finder, 109 dialog box, 222 Firefox (web browser), 266–268, 369 fonts firefox-bin process, Firefox web browser, 369 copying, 458, 459 Firestarter, 175 installing TrueType Core Fonts, 459–460 configuring overview, 458 overview, 202–203 Fonts option, OpenOffice.org, 470 setting inbound rules, 203–204 Fontwork tool, 506 setting outbound rules, 205 Foomatic D1000 scanner, 677 turning off diagnostic services, 206–207 footers, in Writer, 489–490 installing, 201–202 Force Quit applet, 254 firewalls, 200. See also Firestarter foreground (top) color box, 439 Fish applet, 254 Foreground Select tool, GIMP, 437 FLAC audio file format, 406 Form Control toolbar, Base, 519 flagging e-mail messages, 527 Form Navigation toolbar, Base, 519 flags command-line, 314 Form Wizard, Base, 516 Flash Format category, OpenOffice.org, 466 adding support for, 417, 419 Format Cell dialog box, Calc, 492 animations, 425 formatting exporting Impress presentation as Flash data, in Calc, 491–492 file, 509–510 text, in Writer Flash Player software, 268 context menu, 480–481 flatbed scanners, 158 Formatting toolbar, 479–480 flavors of Linux, 19–20 overview, 479 Flip tool, GIMP, 438 Style and Formatting palette, 481 floating palettes, OpenOffice.org, 463 Formatting Aids option, OpenOffice.org floating toolbar, OpenOffice.org, 476 Writer, 471–472 floppy disk drive, 298 Formatting toolbar floppy system group, 582 Calc, 492 flow charts, 454 Impress, 506 Fluendo MP3 codec, 397 OpenOffice.org, 464 FluidSynth virtual synthesizer, 409 Writer, 479–480
- 744. 708 ■I N D E X formatting tools, Writer, 260 Gedit text editor, 312, 585–586 forms, 264, 513 GeForce 6600 graphics card, 162 Formula bar, Calc, 494 General option, OpenOffice.org, 470–473 formulas, in Calc General tab, power-management overview, 493 preferences, 148 summing figures, 494 Generic filters, GIMP, 446 using Function Wizard, 493–494 genisoimage command, 609 forums, 676–677 Geometry option, 3D effect, 508 forward slash (/), 279 get command, sftp, 625 forward slash key (/), 673 GIDs (group IDs), 577, 580 FQDN (fully qualified domain name), 620 GIMP program, 271–272 Frame category, OpenOffice.org, 467 cropping, 444 framebuffer graphical mode, 77 filters, applying, 446–448 free command, 341 healing, 444 Free Select tool, GIMP, 436 making color corrections, 442–444 Free Software Foundation (FSF), 16 overview, 434–440, 442 free space, 58 sharpening, 445 freeing disk space, 596 GIMPshop, 448 FSF (Free Software Foundation), 16 gksu command, 325 F-Spot glib libraries, GTK+ 1.2, 570 importing photos using, 430–431 Global Face Dir option, 245 main window, 431 Global Regular Expression Print, 358 overview, 431 GMT (Greenwich Mean Time), 53 tagging images using, 433 GNOME Art web site, 217–219 tweaking photos using, 431–432 GNOME CD/DVD Creator, 601 fstab (File System Table), 337, 340 GNOME CPU Frequency Scaling Monitor, 145 FTP program, 624 GNOME desktop, 332 full- screen option, 307 GNOME Onscreen Keyboard (GOK), 245 fully qualified domain name (FQDN), 620 GNOME option, 241 Function Wizard, in Calc, 493–494 GNOME PPP dial-up tool, 142 functions, adding to toolbars in OpenOffice.org, 465–467 GNOME session, managing, 589–591 fuse system group, 582 GNOME Terminal, 145, 308, 323, 372, 381 Fuzzy Select tool, GIMP, 437 GNOME themes, 214 GNOME-Look web site, 217 ■G gnome-power-manager tool, 590 g switch, 581 gnome-session-manager program, 589 G switch, 582 GNU and Linux together, 18–19 GCC (GNU Compiler Collection), 16, 569 GNU C Library, 548 GCompris, 688 GNU Compiler Collection (GCC), 16, 569
- 745. ■I N D E X 709 GNU organization, 5 GStreamer multimedia framework, 394 GNU project, 16–17 GStreamer plug-in package, 414 GNU Public License (GPL), 17–18 gstreamer0.10-plugins-ugly-multiverse Gnumeric, 460 software package, 407 Go menu, Nautilus, 284 GtkRC file option, 242 gocr program, 158 GUI. See graphical user interface GOK (GNOME Onscreen Keyboard), 245 GUI terminal emulator, 381 Google Summer of Code sponsorship Guided − Use Entire Disk option, 57 scheme, 601 guru status, 10 GParted tool, 59 gutsy (distribution repository), 551 GPL (GNU Public License), 17–18 gzip program, 607 Gradient fill tool, GIMP, 438 ■H Graphic category, OpenOffice.org, 467 h command option, 344 graphical desktop operating system, 5 h option, 344 graphical problems, 84–90, 92 hackers, 179 graphical subsystem, 367 halt command, 341 graphical user interface (GUI), 19 hard drive space, freeing up adding and deleting users via, 578–579 reclaiming space, 34–35 creating and deleting groups via, 580 removing Windows, 35 GUI applications, accessing remotely using another hard disk, 35–36 accessing Ubuntu via Remote Desktop, hard links, 248, 332–333 627–629 Hardware Drivers utility, 162 overview, 626 hardware support running X applications on remote computer, 621, 626, 628, 630 overview, 117–118 graphics card, 77 proprietary vs. open source drivers, 118–119 Graphics Card tab, Screens and Graphics Hardy Heron, 43, 681 utility, 87 hardy repository, 551 graphics cards, 119 hash (#), 309 Greenwich Mean Time (GMT), 53 head command, 348–350 grep command, 384 head mytextfile command, 349 Grid option, OpenOffice.org, 471–473 headers, in Writer, 489–490 group IDs (GIDs), 577, 580 healing, in GIMP, 439, 444 groupdel command, 583 help groups, creating and deleting via GUI, 580 online Groups tab, Users and Groups program forums, 676–677 window, 580 mailing lists, 678 growisofs command, 610 other official sites, 678 GRUB boot loader, 83 overview, 676 GRUB boot menu, 71 third-party sites, 679
- 746. 710 ■I N D E X in OpenOffice.org, 474 Image file types, 290 overview, 671 Image-Editing Tools, GIMP, 436 via manual image-tweaking tools, Writer, 483 info pages, 674–675 Import window, F-Spot, 430 man pages, 672–674 importing overview, 671 documents and settings of user README files and other accounts, 68 documentation, 675–676 photos, using F-Spot, 430–431 Help Agent, 474 public key, 188, 190 help command, 341, 378, 625 Impress program :help command, vim command-line animating slides, 504–506 mode, 355 overview, 263–264 Hex keys, 130 inbound data connection, 202 hexadecimal (hex) text, 130 inbound traffic policy, 203, 205 hibernating, 103, 147–148 Include Threads drop-down box, hidden files and directories, 289 Evolution, 534 hierarchical file system, 333 incremental backup, 603 high-resolution mouse, 233 individual configuration programs, 121–124 history of Linux, 13–15 installing software, 122–124 /home directory, 177, 240, 324, 333, 335, 339, using command line, 122 599, 603 .inf files, 132, 137 /home/keir directory, 342 info pages, 674–675 HTML file types, 290 man pages, 672–674 Hue/Saturation option, GIMP, 442 overview, 671 Hurd, 19 README files and other documentation, hyperlinks. See links 675–676 Inhibit Applet, 254 ■I Ink tool, GIMP, 439 i command, 353, 359 Inkscape program, 435 .i386.deb file extensions, 560 input devices, personalizing icons, 215 keyboard settings, 237–240 choosing set, 217 mouse options, 233–234 for files and folders, 288 overview, 233 before menus, hiding/showing, 224 Insert category, OpenOffice.org, 466 Ubuntu desktop, 105 Insert mode, vim text editor, 353–354 id command, 581 inserting data and cells, in Calc, 492 IDE-based hard disks, 59 Install Theme button, Theme Preferences ifconfig command, 310 dialog box, 219 Illumination option, 3D effect, 508 Install Updates button, Update Manager Image editor, 258 window, 198
- 747. ■I N D E X 711 installation Synaptic Package Manager 3D drivers, 160–163 installing software, 555–557 compiler tools, 569 overview, 553 Firestarter, 201–202 removing software, 557 Linux installation files, 546–547 searching for software, 553–555 managing software repositories theme components, 217–219 adding or removing repositories at TrueType Core Fonts, 459–460 command line, 568–569 Ubuntu overview, 565–566 overview, 43–45 Software Sources program, 566–567 stage 1: preparing Windows partition for other versions of Ubuntu, 684–685 resizing, 46–48 overview, 545–546 stage 2: booting from CD-ROM, 48–49 package management stage 3: choosing language settings, 50 dependency management, 548–549 stage 4: selecting from boot menu, 50–52 overview, 547–548 stage 5: choosing language for, 52 package repositories, 550–551 stage 6: selecting country and time zone, repository components, 552–553 53–54 package management from command stage 7: confirming keyboard layout, prompt 54–55 overview, 558 stage 8: repartitioning hard disk, 55–66 using APT tools, 561–565 stage 9: entering user name, 66–68 using dpkg, 558–561 stage 10: importing documents and settings, 68 playback software stage 11: confirming installation adding Flash support, 417, 419 choices, 69 adding Java support, 419–420 stage 12: waiting during installation, 70 installing codecs, 414–416 stage 13: rebooting Ubuntu, 71–73 installing RealPlayer, 416–417 Installing System progress bar, 79 overview, 413–414 instant messaging, 171–173 problems with, 79–81. See also interface, general, configuring options, postinstallation problems; 224–225 preinstallation problems Internet access graphical problems, 84–92 configuring Ethernet network device, overview, 75 125–126, 128 Skype, 411–412 connecting to wireless networks, 128–131 software repositories, 549–550 joining wireless network, 131 from source overview, 124 compiling, 571–573 using dial-up telephone modems, 141–143 installing compiler tools, 569 overview, 569 unpacking tarball and solving dependencies, 570–571
- 748. 712 ■I N D E X using NdisWrapper to install Windows kernel-tree, 595 wireless network drivers, 131–133, key combination, 240 139–140 key pair, generating, 181–184 blacklisting existing drivers, 138–139 keyboard extracting driver components, 137–138 Bluetooth, 166 installing configuration tools, 133 layout, confirming, 54 installing Windows XP drivers, 133–134 settings, 240 installing wireless networking accessibility, 238–239 hardware, 134–136 general, 237 removing drivers, 140–141 layout, 237 using NetworkManager, 124–125 mouse key, 239 working with proxy server, 144 overview, 237 Internet Explorer favorites, 38 shortcuts, 240 Internet files, 38 adding, deleting, or modifying, 224 Internet telephone, 411–412 in BASH, 379–380 Internet Updates tab, 566 overview, 379 Internet-facing services, 175 for system control, 380–381 Invest applet, 254 for working in BASH, 379–380 IP address, 295 Keyboard Accessibility Status applet, 254 iptables tool, 175, 200 Keyboard Indicator applet, 254 IPv4 local area network addresses, 592 Keyboard Preferences dialog box, 237 .iso file extension, 691 keys. See private key; public key ISO images killall command, 372 of CD release of Ubuntu 8.04, 43 KMail program, KDE, 685 creating bootable CDs from, 690–693 KOffice, 460 ■J Konqueror, 557 j option, 608 Kubuntu, 44, 107, 685–687 Jamendo online mustic strore, 400–401 kubuntu-desktop package, 685 Java, 419–420, 471 Jazz++ sequencer, 409 ■L -l (long option), 315 jfs file system, 336 l option, 323 jobs, controlling, 373–374 LAMP acronym, 24 junk e-mail, 532 language settings, 50, 52, 471 ■K last command, 341 KDE (K Desktop Environment), 107, 685 launchers, 246 kdebase metapackage, 557 launching files and running programs, keir user, 328 289–291 kernel module, 131, 138 layers, GIMP, 441 Kernel Panic errors, 77
- 749. ■I N D E X 713 Layouts tab, Keyboard Preferences dialog no annoying copy protection or usage box, 237 restrictions, 9 lcd command, sftp, 625 overview, 8 learning to use Linux, 23–24 security, 8–9 least privilege, 199 flavors of, 19–20 left angle bracket (<), 361 learning to use, 23–24 Left/right cursor key shortcut, BASH, 380 obtaining, 25–26 legalities of playback, 391–393 who uses, 24–25 listening to audio CDs, 404 List view, Contacts mode, Evolution, 535 overview, 391 live distro mode, 44 playing audio files Live365, 402 installing codecs, 394 lls command, sftp, 625 overview, 393 lmkdir command, sftp, 625 using Rhythmbox, 397, 399 ln command, 332 ripping music from CDs local printer, configuring, 150–152 adding MP3-ripping support to Sound Local tab, Login Windows Preferences dialog Juicer, 407 box, 243 choosing format, 406–407 locate command, 342–343 overview, 405–406 Locate Pointer option, 234 process, 408–409 Location bar, Nautilus window, 284 less command, 348 Lock Screen applet, 254 lib directory, 335 Lock Screen option, 103 libc6 package, 548 Log Out option, 103 libglib package, 571 logging in, 99, 100, 587–588, 620–623 libgtk package, 571 login options, 241–245 libraries, 303, 593 accessibility settings, 243 license, 9 general settings, 241–242 Light and Shadow filters, GIMP, 446 local settings, 242–243 link-local networking, 126 overview, 240–241 links, 675 remote settings, 243 hard, 332–333 security settings, 243–244 symbolic, 332 user settings, 244–245 symbolic and hard, 248 login picture, 246 Linux, 3–5 Login Window Preferences window, 588 age of, 5–6 long option (-l), 315 benefits of lost+found directory, 335 fewer crashes, 8 lpadmin system group, 582 free and shareable, 9 ls command, 315, 625 Linux community, 9–10 ls -l command, 325, 332, 344
- 750. 714 ■I N D E X ■M Map filters, GIMP, 447 m command, 580 Mark for Complete Removal option, 557 Mac OS X, 109, 110 Mark for Removal option, 557 Macintosh HD icon, 110 Mark Recommended for Installation Macromedia Flash (SWF), 264, 509 option, 555 macros, recording, 475 Mark Suggested for Installation option, 555 Magnatune online music store, 400 Material option, 508 mail merging, 472, 486–489 Max Size tab, 603 Mail mode, Evolution .mbox (mailbox) files, Thunderbird's, 527 composing messages, 528–529 Measurer tool, GIMP, 437 creating e-mail signature, 529–530 media directory, 335 creating new folders, 531 meetings, 538 creating search folders, 533–534 memory cards, 157, 429 deleting messages, 526 Memory option, OpenOffice.org, 470 flagging messages, 527 memory sticks, 157–158 junk e-mail, 532 Memory test option, Boot menu, 52 overview, 530 Memos mode, Evolution, 523, 540 reading e-mail, 526 Memtest86 program, 52, 71, 77 sending and receiving e-mail, 524 Menu Bar applet, 254 sorting and filtering messages, 532–535 menus Mail Preferences icon, Preferences dialog adding all menus to Panel, 249 box, Evolution, 526 adding Applications menu to Panel, mailbox (.mbox) files, Thunderbird's, 527 249–250 mailing lists, 678 adding, deleting, or modifying items, 224 Main Distribution repository, 551 customizing, in OpenOffice.org, 468 Main Menu applet, 254 deleting, 250–251 Main section, 552 overview, 249 main toolbar window, GIMP, 435 Menus element, 105 Main work area, 503 metapackages, 557 make command, 572 Microsoft, 3, 176 make install command, 572 Microsoft Access, 264 Make Link option, 248 Microsoft Office, 453–454 Makefile file, 572 Microsoft Outlook, 169, 527 man ufw command, 200 Microsoft Virtual PC 2004, 36 managing users. See users, managing middle mouse button, 113 Manual backups mode, Simple Backup, 602 Mines, 276 manual mode, NetworkManager, 125 movie playback, 269 manual partitioning screen, 81 overview, 257–259, 273 Manual Proxy Configuration, 144 photo editing, 271–272 Pidgin Internet messenger, 275
- 751. ■I N D E X 715 presentation, 263–264 Move tool, GIMP, 437 running, 110, 289–291 Movie/DVD player, 258 spreadsheet, 261–262 movies web browsing, 266–268 editing software, 425 word processing, 260–261 overview, 422 Minix, 13 watching, 420–422 Mist theme, 214 moving files, BASH shell, 316–317 MIT Artificial Intelligence Lab, 17 Mozilla Firefox Bookmarks, 38 mkdir command, 319 Mozilla Foundation, 38, 546 mkdir command, sftp, 625 Mozilla Plug-in option, OpenOffice.org, 473 mkisofs command, 674 Mozilla Thunderbird e-mail client, 38 /mnt directory, 335, 339 mozilla-plugin-vlc, 555 /mnt/windows directory, 340 MP3 audio file format, 407 Modem Monitor_ applet, 254 MP3 playback, 391 modems, 141–143 MP3 player, 258 Modify category, OpenOffice.org, 467 MP3-ripping support, adding to Sound modulename, 138 Juicer, 407 Monitor model option, Screens and Graphics MPAA (Motion Picture Association of Utility, 86 America), 423 more command, 348 MS-DOS prompt, 258 Motion path option, Add button dialog Multics, 6 box, 505 multimedia. See also digital audio; movies Motion Picture Association of America DVDs, 423 (MPAA), 423 flash animations, 425 mount command, 322 installing playback software mount points, 59, 64 adding Flash support, 417–419 mounting, 280 adding Java support, 419–420 drive, manually, 338–340 installing codecs, 414–416 mount command, 337–338 installing RealPlayer, 416–417 overview, 337 overview, 413–414 removing mounted system, 340 overview, 413 mouse, 113 TV, 426 Bluetooth, 166 multiple virtual desktops, 213 options, 233–234 multiple-speaker surround sound, 168 pointer Multiverse section, 553 controlling with keyboard, 239 MusE sequencer, 409 customizing, 217 music. See digital audio mouse (KVM) switch, 76 music stores, online. See online music stores Mouse Orientation option, 234 mutt e-mail program, 555 Mouse Preferences dialog box, 233 mv command, 316
- 752. 716 ■I N D E X My Computer/Computer icon, NetworkManager, 124–125 Windows, 108 New Panel option, 248 My Documents/Documents folder, newbie status, 10 Windows, 108 NI column, top program, 367 My Network Places, 108, 294 Noise filters, GIMP, 446 myprogram program, /home/keir Norton's Partition Magic, 33 directory, 310 NoScript tool, 212 ■N Notes heading, man page, 673 n command, 349, 352 Notification Area, 148, 254 N command, 352 Notification area, Ubuntu desktop, 106 Name heading, man page, 673 Novell GroupWise, 169 names of files, 280 Numbering category, OpenOffice.org, 467 nano text editor, GNU, 614 nVidia GeForce 6600 graphics card, 162 Nautilus program, 259, 270–271 nyy command, vim command mode, 353 file and folder icons, 288 overview, 283–286 ■O O command, vim command mode, 353 searching for files, 286 o command, vim command mode, 353 special windows, 288–289 o option, 674 Navigate category, OpenOffice.org, 467 OASIS OpenDocument Format (ODF), 457 ndd command, vim command mode, 352 object modes, Nautilus, 288 NdisWrapper, using to install Windows wireless network drivers obtaining Linux, 25–26 blacklisting existing drivers, 138–139 ODF (OpenDocument Format), 457, 476 extracting driver components, 137–138 Office file format, 456 installing configuration tools, 133 Office, Microsoft. See Microsoft Office installing Windows XP drivers, 133–134 official sites, 678 installing wireless networking hardware, Ogg media format, 392 134–136 Ogg Theora, 422 overview, 131–133, 139–140 Ogg Vorbis audio file format, 406 removing drivers, 140–141 On AC Power tab, 146–147 NeoOffice, 456 On Battery Power tab, 147–148 network address of printer, 153 one-off tasks, using at command to Network button, Finder, 109 schedule, 618 Network Manager program, 590 online help Network Monitor applet, 254 forums, 676–677 network name, 295 mailing lists, 678 Network Neighborhood, 294 other official sites, 678 network printers, configuring, 152–156 overview, 676 networked files, accessing, 294–296 third-party sites, 679
- 753. ■I N D E X 717 online music stores Options category, OpenOffice.org, 466 Jamendo, 400–401 Options configuration dialog box, Writer, 489 Magnatune, 400 Options heading, man page, 673–674 overview, 399–400 outbound traffic, 202 online radio stations, 401–402 outgoing connections, 205 online updates, 197–198 Outlook, Microsoft, 169, 527 open source drivers, 82, 118–119 ■P OpenDocument Format (ODF), 457, 476 p command, vim command mode, 353 OpenOffice.org. See also Base program; Calc package files, cache of, emptying, 597 program; Impress program; Writer program package management configuration options, 470 from command prompt creating macros, 475–476 overview, 558 customizing interface using APT tools, 561–565 adding functions to toolbars, 465–467 using dpkg, 558–561 adding new toolbar, 467–468 dependency management, 548–549 configuring options, 469–473 overview, 547–548 customizing menus, 468 package repositories overview, 465 categories of, 551 file compatibility, 455–457 overview, 550 fonts repository components, 552–553 copying Windows fonts, 458 package-manipulation command, 558 installing TrueType Core Fonts, 459–460 Paintbrush tool, GIMP, 438 overview, 458 pairing, 163 getting help, 474 Panel entry, GIMP, 434 inserting objects with Object Linking and panel items, moving, 251 Embedding, 474–475 panels, personalizing, 248–249 interface, 463–464 Paragraph dialog box, Writer, 480 key features, 454–455 parent directory, 319 overview, 453, 463 parent processes, 369 saving files, 476–477 partitioning, 31–33 similarities with Microsoft Office, 453–454 passphrase, 130 using wizards, 474 passwd command, 582–583 openoffice.org-base package, 264 passwords, 196 open-source software, 457 adding and changing, 583–584 Opera browser, 259 displaying/hiding, 241 operating systems, 3–4 pasting text, 114 opt directory, 335 patented software, 391 Optimal Page Wrap, Writer, 484 Path creation tool, GIMP, 437 Options button, 99 PATH variable, 309
- 754. 718 ■I N D E X paths, GIMP, 440 Perspective Clone tool, GIMP, 439 Paths option, OpenOffice.org, 470 Perspective tool, GIMP, 438 Paths tab, 603 phone over Internet, 411–412 pax command, 606 photo editing. See GIMP program PCI ID numbering system, 134 pictures, inserting in Writer, 483–484 PCMCIA card, 141 PID column, top program, 366 PDF (Portable Document Format) files, 290, PID number, 370 454, 476 Pidgin program, 169, 172, 275 PDKSH (Public Domain Korn SHell), 304 Pilot Applet, 254 Pencil tool, GIMP, 438 PIN (personal ID number), 163 period (.), 599 pipe symbol (|), 362, 383 permissive policy, 202 piping and directing output personal ID number (PIN), 163 of commands, 383–385 personal information management program. overview, 383 See Evolution program redirecting output, 385–386 personalization Places menu, 102 desktop items Places pane, Nautilus window, 286 applets, 251–252 plain text (passphrase), 130 menus, 249–251 playback software, installing overview, 246 adding Flash support, 417–419 personalizing panels, 248–249 adding Java support, 419–420 shortcuts, adding, 246–248 installing codecs, 414–416 desktop visual effects, 225–233 installing RealPlayer, 416–417 font preferences, 222–224 overview, 413–414 general interface, 224–225 player application, 394 input devices .pls file, 401 keyboard settings, 237–240 plugdev system group, 582 mouse options, 233–234 podcasts, 402 overview, 233 Pointer Capture applet, 254 keyboard shortcuts, 240 port numbers, of printers, 153 login options, 241–245 Portable Document Format (PDF) files, 290, accessibility settings, 243 454, 476 general settings, 241–242 Ports tab, Properties, 156 local settings, 242–243 postinstallation problems, 81–83 overview, 240–241 overview, 83 remote settings, 243 Windows Vista, 83–84 security settings, 243–244 Windows XP, 84 user settings, 244–245 pound sterling symbol (£ ), 54 login picture, 246 Power Manager program, 590 moving panel items, 251 PowerPC processor, 73 overview, 213–214
- 755. ■I N D E X 719 PowerPoint (PPT), 263, 264 processes power-saving features, configuring controlling overview, 145 killing processes, 369–370 power-management preferences overview, 368–369 On AC Power, 146–147 using other commands for, 371–372 On Battery Power, 147–148 Zombie processes, 370–371 General tab, 148 viewing, 365–368 overview, 145–146 process-killing command, 372 spinning down hard disk, 149–150 profiling application, 199 PPT (PowerPoint), 263, 264 program window, Evolution, 521 PR column, top program, 367 programs. See names of specific programs precompiled kernels, 595 Properties dialog box, 46 preinstallation problems, 75–79 Properties option, context menu, 286 prelink command, 594 Proposed Updates repository, 552 prelinking proprietary drivers, 81, 118–119, 129 configuring, 594 proprietary software, and GPL, 17–18 deactivating, 594–595 Proxy option, OpenOffice.org, 473 overview, 593–594 proxy servers, 144 Presentation file types, 290 ps command, 371 presentation program. See Impress program Public Domain Korn SHell (PDKSH), 304 Presentation Wizard, 263, 502 public key primary key, Base, 518 exporting, 185–186 Print option, OpenOffice.org, 470–472 importing and signing, 188, 190 Print Queue applet, 590 publishing, 186–187 Print Scr button, 39 put command, sftp, 625 print server module, 152 pwd command, 341 printers pwd command, sftp, 625 administering, 156 ■Q configuring local printer, 150–152 :q command, vim command-line mode, 355 configuring network printer, 152–156 :q! command, vim command-line mode, 355 configuring Windows/SMB shared QEMU virtualization software, 36 printer, 154 queries, Database pane, Base, 513 overview, 150 querying packages, 560–561 sharing, 151 question mark (?), 348 privacy, when web browsing, 212 queue name, of printer, 153 private key, 180 quick desktop guides, 107–109 proc directory, 335 Quick Launch toolbar function, Windows, 108
- 756. 720 ■I N D E X QuickTime format, 414 removing Quit applet, 254 applications, 557–558 NdisWrapper drivers, 140–141 ■R packages, 548 r command option, 316, 358 unused software, 597 r switch, 583 Windows, 35 radio stations. See online radio stations Render filters, GIMP, 447 RAM subsystem, 145 renice value, 368 RDP (Remote Desktop Protocol), 629 renicing, 368 README files, 348, 675–676 repartitioning hard disks, 37 Ready To Install screen, 69 manually editing partitioning table, 59–65 Real Simple Syndication (RSS), 402 overview, 55–56 Real Video format, 414 resizing main partition, 56–57 RealPlayer, installing, 416–417 using entire disk, 57 reboot command, 341 using largest contiguous free space, 58 rebooting Ubuntu, 71–73 Reply button, Evolution, 265 receiving e-mail, 524 Reply To All button, Evolution, 265 Recommended backup mode, Simple Backup, 602 reports, Database pane, Base, 513 Recommended Updates repository, 551 repositories, 145, 549–550 recording macros, OpenOffice.org, 475 Backports, 552 Rectangle Select tool, GIMP, 436 gutsy, 551 Recurrence tab, Evolution, 539 hardy, 551 Recycle Bin, 102, 108 Main Distribution, 551 redirecting output, 385–386 Proposed Updates, 552 Reduce Backlight Brightness option, 147 Recommended Updates, 551 rEFlt software, 73 Security Updates, 551 refresh rate option, Screens and Graphics Skype, 568–569 Utility, 87 RES column, top program, 367 Regex tab, 603 Rescue Mode entry, boot menu, 197 regexes, 359 resizing windows, 113 reiserfs file system, 336 resolution, 105 Reload button, 123, 289, 553 Resolution option, Screens and Graphics Remember Password box, Evolution, 524 Utility, 87 remote access to computers, 626–629 Restart option, 104 Remote Desktop, accessing Ubuntu via, Restore As button, 605 627–629 restoring data, 605–606 Remote Desktop Protocol (RDP), 629 restrictive policy, 202 remote shell session, 622 Resume − Resume normal boot option, 98 removable storage, 157, 298–300 reverse dependencies, 548–549, 560
- 757. ■I N D E X 721 Rhythmbox program, 268–269, 393, 397, 399 Save Background Image box, Theme adding podcast, 403 Preferences window, 217 listening to audio CDs, 404–405 saving backup file to CD-R/RW, 609–611 ripping tracks with, 408 sbin directory, 335 Rich Text Format (RTF) files, 347, 456 Scale tool, GIMP, 438 right angle bracket (>), 361, 385 scaled option, Style drop-down list, 221 ripping music from CDs scanner system group, 582 adding MP3-ripping support to Sound scanners, configuring, 158–160 Juicer, 407 scheduling tasks choosing format, 406–407 with anacron, 616–617 overview, 405–406 with crontab, 613–615 process, 408–409 overview, 613 rm command, 318, 625 using at command to schedule one-off rmdir command, 625 tasks, 618 roaming mode, NetworkManager, 125 SchoolTool Calendar, 688 root and ordinary users, 177–178 Scissors Select tool, GIMP, 437 root directory, 335, 378 scp, transferring files between remote computers using, 623–624 Root − Drop to root shell prompt option, 98 Screen arrangement option, Screens and root file system, 59 Graphics Utility, 87 root password, 577 screen program, 623 root user, 177, 576–577 screenlets, difference from applets, 252 Rosegarden sequencer, 409 Screenreader, 245 Rotate tool, GIMP, 438 Screens and Graphics Utility, 86–90, 92 RSS (Real Simple Syndication), 402 Search button, Synaptic Package Manager RTF (Rich Text Format) files, 347, 456 toolbar, 553 Ruler, OpenOffice.org, 464 search folders, in Evolution, 533–534 Run Application applet, 255 Search for Files applet, 255 run level, 312 Search option, OpenOffice.org, 473 Run Xclient Script option, 241 searching for files, 342–344 running programs, 110, 289–291 secondary channels, 59 rw- file permissions, 328 Secure Remote Connection option, 241 Secure Shell (SSH) tool, 202 ■S S (status) column, 370 secure shell, remote access to computers using S column, top program, 367 logging in to remote computer, 620–623 -s command option, 332 overview, 619–620 S command option, 344 transferring files between remote s command option, 344 computers, 623–625 Sanskrit, 306 Secure Socket Layer (SSL), 141 Save As drop-down list, OpenOffice.org, 476
- 758. 722 ■I N D E X security, 8–9 Sharpen filter, GIMP, 445 common-sense security, 196–197 sharpening, in GIMP, 445 encryption Shear tool, GIMP, 438 decrypting files, 193 shell commands, 341, 383 of files, 190–192 shell scripting, 386 overview, 179–180 ShipIt page, of Ubuntu website, 9 setting up for, 180–188, 190 shortcuts, 332–333. See keyboard, shortcuts Firestarter, 201–207 adding online updates, 197–198 creating launchers, 247 overview, 175–176 creating links, 248 root and ordinary users, 177–178 overview, 246 signing and encrypting e-mail, 194–196 Show Desktop applet, 255 Ubuntu firewall, 200. See also Firestarter Show Hide Buttons, 249 virus scanning, 207 SHR column, top program, 367 for web browsing, 212 shred command, 341 Windows security vs. Linux security, shriek, 382 176–177, 179 Shut Down option, 104 Security option, OpenOffice.org, 470 Shutdown/Reboot button, Windows, 108 Security tab, Login Windows Preferences Shuttleworth, Mark, 681 dialog box, 243 signatures, e-mail, 529–530 Security Updates repository, 551 signing Select by tool, GIMP, 437 e-mail, 194–196 self-installing binaries, 547 public key, 188, 190 self-installing package, Windows, 631 Simple Backup Sensitivity setting, 235 changing backup file destination, 604 Separator applet, 255 changing time period between serial port, 141 backups, 605 Serpentine program, 270–271 excluding files and folders, 603 Service Set Identifier (SSID), 129 including files and folders, 603 Sessions program, 589 overview, 601–603 setting up for. See also firewalls restoring data via, 605–606 settings of user accounts, importing, 68 Skype setup.exe program, 44 installing, 411–412 sftp repository, 568–569 commands, 625 slash (/), 348 transferring files between remote sleep (standby) mode, 146, 148 computers using, 624–625 sliders, GIMP, 443 Shading option, 3D effect, 508 slides, animating, 504–506 shared folder, accessing, 295–296 Slides pane, 503 sharing printers, 151
- 759. ■I N D E X 723 slow keys, 239 standard error, 386 Smudge tool, GIMP, 439 standard input (stdin), 383, 386, 674 software standard output (stdout), 383, 386, 674 installing, 122–124, 196 Standard toolbar, OpenOffice.org, 463 patents, 391 standby (sleep) mode, 146, 148 removing, 597 Star Office, 453 setting up online software Start menu function, Windows, 108 repositories, 145 Start or install Ubuntu option, Boot menu, 51 Software Update Notifier, 109 starting up, 97–99 Software Updates tool, 591 static addresses, 39, 592 Sophos antivirus labs, 177 Statistics tab, 567 Sort By drop-down list, Calc, 495 status (S) column, 370 sort command, 385 Status bar, OpenOffice.org, 464 Sort Lists option, OpenOffice.org Calc, 472 stdin (standard input), 383, 386, 674 sorting stdout (standard output), 383, 386, 674 data, in Calc, 495–496 sticky keys, 238 e-mail messages, 532–535 Sticky Notes applet, 255 sound cards, configuring, 168–169 storage devices, removable Sound Juicer program, 268, 393, 404, 407, 408 ejecting media from drives, 299–300 source code, 14, 546 overview, 298 Spaces function, 110 storage, file, 281–282 speed command option, 674 storing Speex audio format, 406 backup data, 609 spell-checking, in Writer, 481–482 files, 281–283 spinning down hard disk, 149–150 Style and Formatting palette, in Writer, 481 Spotlight function, 110 subdirectories, 282 Spreadsheet file types, 290 submenus, GIMP, 446 spreadsheet program. See Calc program sudo apt-get build-essential command, 569 spyware, 203 sudo apt-get dist-upgrade square brackets, 360 command-line, 564 srv directory, 335 sudo apt-get update command, 564 SSH (Secure Shell) tool, 202 sudo apt-get upgrade command-line, 564 ssh remote shell session, 620 sudo command, 331, 577, 580 ssh server program, 620 sudo passwd root command, 576 ssh suite, 619 sudo system, 325 ssh-keygen program, 622 suid bit, 328 SSID (Service Set Identifier), 129 Sum icon SSL (Secure Socket Layer), 141 Calc, 494 Stallman, Richard, 16–17 Writer, 485
- 760. 724 ■I N D E X Summary field, Evolution, 538 System Restore, 35 Sun Microsystems, 20, 453 system variable, 309 superusers, 177, 324 ■T supplementary groups, 581 t command option, 340 support, hardware t option, 608 overview, 117–118 Tab key, and BASH, 377 proprietary vs. open source drivers, Table category, OpenOffice.org, 467 118–119 Table option, OpenOffice.org Suspend option, 103 Writer/Web, 472 swap partition, 59, 61 Table tool, Writer, 484 Sweep audio editing software, 409 Table toolbar, Writer, 485 SWF, 264, 509 Table Wizard, Base, 514 Switch User option, 103, 109 tables switches command-line, 314 adding to databases, 514–515 symbolic links, 248, 332 Database pane, Base, 513 symbols in file names, 280 editing database table, 518 Synaptic Package Manager, 25, 120, 122, 394, Writer, 472 426, 460, 549–550, 594, 601, 620 in Writer, 484–485 installing software, 555–557 tagging images, 433 overview, 553 tail command, 348–350 removing software, 557 tail mytextfile command, 349 searching for software, 553–555 Tanenbaum, Andrew, 14 Synopsis heading, man page, 673–674 tape system group, 582 sys directory, 335 tar archives .sys files, 132, 137 compressing, 607–608 system control, keyboard shortcuts for, 380–381 extracting files from, 608 system, controlling viewing information, 608 controlling jobs, 373–374 tar command, 606, 614, 617 controlling processes .tar files, 606 controlling Zombie processes, 370–371 tarballs, 547, 570–571 killing processes, 369–370 .tar.gz archive, 219 overview, 368–369 Task Details dialog box, 541 using other commands for, 371–372 task field, 617 overview, 365 Tasks, Evolution, 266, 523, 540–541 viewing processes, 365–368 Tasks pane, Base, 513 system fonts, 222 tasks, scheduling. See scheduling tasks System menu, 102 telephone over Internet, 411–412 System Monitor applet, 255 television, 426 System Preferences icon, 110 templates, 501
- 761. ■I N D E X 725 Templates category, OpenOffice.org, 466 tilde (~), 615 terminal emulator program, 307 tiled option, Style drop-down list, 221 terminal programs, 303 Time bar, Totem Movie Player, 269, 421 Terminal Server Client Applet, 255 time zone, selecting, 53–54 Terminal Server Client program, 630 TIME+ column, top program, 367 terminal window, 122, 682 /tmp folder, 335, 596, 613 Texinfo system, 674 Tomboy Notes applet, 255 Text editor/viewer, 259 toolbars text files adding functions to, 465–467 comparing, 361–362 adding new toolbar, 467–468 overview, 347 text in buttons, 225 searching through top program, 365 overview, 358 Torvalds, Linus, 10, 13, 15 using grep, 358–359 Totem Movie Player, 269, 307, 393 using regular expressions, 359–361 totem-xine package, 424–425 types, 290 touch command, 341 viewing touchpad settings, 236 overview, 347 Tracker Applet, 590 using cat command, 347 Tracker process, 590 using head and tail commands, 348–350 transferring files using less command, 348 between Bluetooth devices, 164–165 Text Formatting toolbar, 263 between remote computers, 623–625 text in toolbar buttons, 225 Trash, 102, 108, 110, 251, 255, 526 Text tool, GIMP, 438 TrueType Core Fonts, 458–460 text-based shell, 304 Tux Paint, 688 Textures option, 508 TV (television), 426 Theme Preferences dialog box, 214 TWAIN modules, Windows, 430 themes Typing Break tab, Keyboard Preferences changing individual components, 215–217 dialog box, 240 installing additional components, ■U 217–219 u command, vim command mode, 353 overview, 214–215 UAC (User Account Control) dialog boxes, Third Party tab, 566 Windows Vista, 176 third-party sites, 679 Ubuntu blog, 679 Third-Party Software tab, 566 Ubuntu Document Storage Facility, 678 three dashes (---), 329 Ubuntu firewall, 200. See also Firestarter Thunderbird e-mail client, 38 Ubuntu forums, 123, 142 Thurderbird e-mail client, 527 Ubuntu Guide, 124, 679 TightVNC system service, 631 Ubuntu root file system, 334
- 762. 726 ■I N D E X Ubuntu Server, 682 userdel command, 583 Ubuntu Software tab, 566 Username box, 295 ufw tool, 200 users and file permissions UIDs, 577 altering permissions, 330–331 umount command, 340 overview, 324–325 underscore (_) character, 280 viewing permissions undo command option, 594 overview, 325–328 Unique Udev ID (UUID) number of Windows permissions on directory owned by root, partition, 292 329–330 United States Computer Emergency permissions on user's directory, 329 Readiness Team, 6 typical data file permissions, 328–329 Universe section, 552 users, managing Unix operating system, 13, 20 adding and changing passwords, 583–584 Unlock button, 576, 578, 580 adding and deleting groups at command Unmatched Search Folder, 534 line, 580–583 Unmount Volume, 299, 430 adding and deleting users unused software, removing, 597 at command line, 580–583 unzip command, 373 via GUI, 578–579 Update Manager, 198 creating and deleting groups via GUI, 580 Update Notifier tool, 591 Users tab, Login Windows Preferences dialog updates, online, 197–198 box, 244 Updates tab, 566 user-scheduled tasks, 613 uppercase letters, 280 usr directory, 336 uptime command, 341 /usr/share/doc directory, 675 usage restrictions, 9 UUID (Unique Udev ID) number of Windows partition, 292 USB Legacy Support, 76 USB memory sticks, 81, 157–158 ■V USB socket, 321 v option, 608 User Account Control (UAC) dialog boxes, validating e-mail, 194–195 Windows Vista, 176 /var directory, 336, 345 User Account Editor dialog box, 578 /var/backup directory, 604 user accounts, importing documents and variables, 309 settings, 68 VBA (Visual Basic for Applications), 261, 455 USER column, top program, 366 vCard, Evolution, 537 User Data option, OpenOffice.org, 470 vector graphics creation tool, 454 User folders update tool, 591 versions of Ubuntu User Privileges tab, 579 Edubuntu, 687–689 User Switcher applet, 255 installation of, 684–685 useradd command, 580–583 Kubuntu, 685–687 user-defined string, 384 overview, 683
- 763. ■I N D E X 727 Ubuntu Server, 682 Visual Assistance utility, 591 Xubuntu, 689 Visual Basic for Applications (VBA), 261, 455 Vertical message window, 535 visually impaired tools, 226 video system group, 582 VMware, 8, 36 videos, 420–422 VNC (Virtual Network Computing) View As Icons/List, Nautilus window, 285 software, 627 View category, OpenOffice.org, 466 VoIP (Voice over IP), 411–412 View menu, Nautilus, 284 Volume Control applet, 255 View option, OpenOffice.org, 470–473 Volume Manager program, 591 vim command mode, 352, 355 vv option, 608 vim text editor ■W creating new text file using, 357–358 w command, vim command mode, 353 modes :w command, vim command-line mode, 355 Command mode, 351–353 :w! command, vim command-line mode, 355 Command-Line mode, 354–355 wallpaper Insert mode, 353–354 changing, 221 overview, 351 personalizing, 219–222 overview, 350–351 WAV audio format, 407 using to edit file, 355–357 Weather Report applet, 255 viewing web browsers, 258, 266–268 creating new text file using, 357–358 Web filters, GIMP, 448 modes, 351–355 web of trust, 189 overview, 350–351 web proxy, 144 using to edit file, 355–357 websites VIRT column, top program, 367 official sites, 678 virtual desktops, 111–113, 213, 227 third-party sites, 679 virtual files, 321–323 WEP encryption, 131 Virtual Network Computing (VNC) whatis command, 341 software, 627 whereis command, 344 Virtual PC 2004, Microsoft, 36 widgets, 215 virtualization software, 36 Wi-Fi networks, 128, 592 viruses, 7, 175–176 Wi-Fi Protected Access (WPA) system, 131 Clam Antivirus window borders, 215, 216 dealing with infections, 210–211 Window List applet, 255 scanning for viruses, 209 Window Selector applet, 255 updating database, 208 windows overview, 207 Nautilus, special windows, 288–289 Visible Buttons entry, 465 resizing, 113
- 764. 728 ■I N D E X Windows worms, 176 connecting to Windows computers WPA (Wi-Fi Protected Access) system, 131 remotely, 629–632 WPA (Windows Product Activation), 9 files, accessing Writer program, 260–261 accessing networked files, 294–296 adding headers and footers, 489–490 overview, 291 formatting text working with files in Windows context menu, 480–481 partitions, 292, 294 Formatting toolbar, 479–480 fonts, copying, 458 overview, 479 installing Ubanu inside, 47–48 Style and Formatting palette, 481 partitions, preparing for resizing, 46 inserting pictures, 483–484 printer sharing, 150 mail merging, 486–489 problems with, 6–8 overview, 479 removing, 35 spell-checking, 481–482 security of, vs. Linux security, 176–177, 179 working with tables, 484–485 Start button, 249 Writing Aids settings, 471 Windows Genuine Advantage, 9 Wubi, 47–48 Windows List bar, 106 Windows Media Player 9 format, 414 ■X Windows Product Activation (WPA), 9 X flag, 626 Windows Update program, 109 X graphical subsystem, 626 Windows Vista x option, 608 burning CDs using, 692 X server communications, 626 freeing up space, 33–34 x86_64 driver file, 136 and security, 176 x86-based processors, 565 security in, 281–283 Xen, 36 Windows XP, 6 Xfce 4 environment, 107 burning CDs using, 692 Xfce Desktop Environment, 689 Professional version, 630 Xfix −Try to fix X server option, 99 security in, 281–283 xfs file system, 336 Windows/SMB shared printer, 154 Ximian, 521 WinZip archive tool, 545–546 X.org, 75, 85 wired networks, 125 XSane utility, 158, 430 wireless network cards, 128, 131, 132 Xterm, 259 wireless networks, 128–131 Xubuntu, 44, 107, 689 wizards, 474 XviD file format, 422 wodim command, 609 ■Y word processing program. See Writer y option, 362 program yy command, vim command mode, 353 Workspace Switcher, 111, 251, 255
- 765. ■I N D E X 729 ■Z .zip files, 132, 258, 273 z command option, 608 Zombie processes, 370–371 z option, 608 Zoom controls, Nautilus window, 284 Z SHell (ZSH), 304 zoom option, Style drop-down list, 221 zero (0) value, 586 Zoom tool, GIMP, 437, 440 Zeroconf (Zero Configuration Networking) ZSH (Z SHell), 304 system, 126 zero-day exploit, 199