Source code version control and git

What is version control system ?
History of version control system
Local version control system.
Centralized version control system
Distributed version control system.
A short history of ‘Git’.
‘Git’ installation and some basics.
Submitted to :Mr. shakirullah 'waseeb' 26/3/2018

 Version control system is a system that records changes to a file or set of files
over time over time so that you can call specific versions latter .
 If you are a graphic or web designer and want to keep every version of an
image or layout , a version control system is a very wise thing to use to do the
following
1- to revert your selected file or files to a previous version.
2- allows you to revert entire project to a specific previous version.
3- compare changes over time.
4- see who made changes in your project.

Continue…
 Or a version control system is a piece of software that helps a team of
developers to work on one single software and archive a complete history of
there work. For the following reasons :
 we want programmers to work simultaneously not serially
 When programmers work together we want there work to not conflict
each other that the VCS solves this problem easily.
 We want to archive every version of something that has ever exited with
the information that who did it why and when did it.

History of version control system:
 Version control systems can be divided into three generations:
 First : in the first generation tools concurrent development was handled only by looks
only one person could be working on a file at the same time. Tools examples: RCS, SCCS.
 Second : the second generation tools are a little bit more permissive than the first
generation but with a less restrictions such that the developer must marge the file before to
commit. Tools examples are : CVS, SourceSafe, sub version ….
 Third : this generation allowed marge and commit to be separated. Tools examples are
: git ...

Local version control system:
 Many peoples’ version control method is to copy into another directory (to
time stamped directory if the programmer is a clever ).
 For the reason that this is a very simple approach that is why it is also very
common.
 The problem is this that if we forget the directory or write into a wrong file
over file we don’t mean.
 To deal with this problems programmers long ago developed a Local VCS the
had a database that kept all the changes made through the file. An example of
local VSCs is : RCS.

Centralized Version control system:
 The other important issue is that a group of programmers should work as a
group on the same software . To solve this problem centralized version
control system was use. The versions such as subversion and purpose.
 In this system we have a server and a number of the clients . For many years
this version was the standard for the version control .
 The main problem with this approach is that if the server goes down no one
can save the new version of there codes to the server.
 Whenever your data is just in one place there is the high risk of losing the
data if the server dies.

Centralized version
Control system
96/3/2018

Distributed version control system:
In DVCS such as Git ,Bazaar or Darcs clients not only check the
latest snapshot of the files and they can fully mirror the
repository including its full history.
 thus if the server dies every client’s data can be backed up to the
server.
It allows you to set up deferent types of workflows that isn’t
possible in centralized database system.

Short history of ‘GIT’:
 Futilisoft began work on a new product calculated the probability (as an
integer percentage ) of winning the power ball for any given set of numbers.
 The company has assigned two developers to work on the same project.
 Harray located in Birmingham ,England. And Sally located in Alamba and
worked together share to the one server in Cleveland .
 They decided to develop this product as a command line product in C and
they used Git 1.7.5 for it.

The image show the
firs git usage
136/3/2018

Next lecture:
‘Git’ installation and basics
6/3/2018Submitted to :Mr. shakirullah 'waseeb' 14

Questions or
suggestions
6/3/2018 15

References:
 www.git.com
 www.sourceCodeControl.com
 www.gitofficial.com
 Pro git by : Scott chockon
 Version control by example By: Erick sink

Source code version control and git

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