![External Commands (contd)
CHKSDK [d:]
• This command is used for checking the
disk and reporting back the status of the
system
• It checks for the memory and gives the
detailed information about the memory
consumed as well as free memory
Example :
CHKDSK A:
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![External Commands (contd)
DISKCOPY [d:] [d:]
used to copy a diskette into another. This
makes the diskette in the first drive on the
diskette in another drive
Example:
DISKCOPY A: B:
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![External Commands (contd)
DISKCOMP [d:] [d:]
• Compare the contents of two diskettes on the
drives specified
• If there is any difference in the contents of the
disks, it gives the message
• Otherwise it asks to compare any other disks
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![External Commands (contd)
TREE [d:] [/F]
This is used to display all the directories and
subdirectories. /F displays all files if specified
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![External Commands (contd)
PRINT: [d:] [path] filename
• This command is used for printing the
contents of documents or files
• This command sends the document or the
file specified to the printer for printing
Example
C:>PRINT D:DOSLETTERMY
LETTER.LET
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![External Commands (contd)
FORMAT [d:] [S] [V]
• This command is used to prepare a fresh
diskette to be used by the DOS for all its
storage purposes
• It divides the disk into tracks and segments
so that the data can be stored
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![External Commands (contd)
DEL TREE [d:] [path]
This command is used to delete the directory
including all the sub directories and the files
This command has to be used carefully as it is
dangerous such that it deletes all the files and
subdirectories permanently
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![External Commands (contd)
XCOPY [drive1:] pathname1 [drive2:] pathname2
It copies files and directories, including
lower level directories
Where drive1 & pathname1 is the source
file or directory, drive2 & pathname2 is the
target file or directory
It is similar to copy command but it also
copies all the subdirectories including
empty directories
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![External Commands (contd)
ATTRIB [+R | -R] [+A | -A] [+S | -S] [+H | -H]
[drive:] [path] [filename] [/S [/D]]
It displays or changes file attributes
+ Sets an attribute
- Clears an attribute
R Read-only file attribute
A Archive file attribute
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![External Commands (contd)
S System file attribute
H Hidden file attribute
[drive:] [path] [filename] It specifies a file for
attrib to process
/S Processes matching files in the current folder
and all subfolders
/D Processes folders as well
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Xternal commands.31
- 1. External commands http://improvec.blogspot.in/ 1
- 2. Objective On completion of this period, you would be able to know External commands-FORMAT, CHKDSK, SCANDISK etc http://improvec.blogspot.in/ 2
- 3. Recap What are internal commands? Internal commands are built – in commands Examples: COPY, DEL, DIR, TYPE, CD, MD, RD, MODE, PATH, DATE, TIME, COPY CON etc http://improvec.blogspot.in/ 3
- 4. Prerequisite What is meant by commands Instructions used to communicate with the computer system http://improvec.blogspot.in/ 4
- 5. External Commands External commands are included in a set of programs called utility programs that are stored on a disk When these commands are used, DOS loads appropriate utility programs from disk and then executes them As a result, external commands are executed much more slowly than internal commands http://improvec.blogspot.in/ 5
- 6. External Commands (contd) CHKSDK [d:] • This command is used for checking the disk and reporting back the status of the system • It checks for the memory and gives the detailed information about the memory consumed as well as free memory Example : CHKDSK A: http://improvec.blogspot.in/ 6
- 7. External Commands (contd) DISKCOPY [d:] [d:] used to copy a diskette into another. This makes the diskette in the first drive on the diskette in another drive Example: DISKCOPY A: B: http://improvec.blogspot.in/ 7
- 8. External Commands (contd) DISKCOMP [d:] [d:] • Compare the contents of two diskettes on the drives specified • If there is any difference in the contents of the disks, it gives the message • Otherwise it asks to compare any other disks http://improvec.blogspot.in/ 8
- 9. External Commands (contd) TREE [d:] [/F] This is used to display all the directories and subdirectories. /F displays all files if specified http://improvec.blogspot.in/ 9
- 10. External Commands (contd) PRINT: [d:] [path] filename • This command is used for printing the contents of documents or files • This command sends the document or the file specified to the printer for printing Example C:>PRINT D:DOSLETTERMY LETTER.LET http://improvec.blogspot.in/ 10
- 11. External Commands (contd) FORMAT [d:] [S] [V] • This command is used to prepare a fresh diskette to be used by the DOS for all its storage purposes • It divides the disk into tracks and segments so that the data can be stored http://improvec.blogspot.in/ 11
- 12. External Commands (contd) • If we want to create a system diskette .i.e., a booted diskette which can be used to boot a system as it has the basic operating system in it, use ‘S’ as option • This V to create a label http://improvec.blogspot.in/ 12
- 13. External Commands (contd) DEL TREE [d:] [path] This command is used to delete the directory including all the sub directories and the files This command has to be used carefully as it is dangerous such that it deletes all the files and subdirectories permanently http://improvec.blogspot.in/ 13
- 14. External Commands (contd) XCOPY [drive1:] pathname1 [drive2:] pathname2 It copies files and directories, including lower level directories Where drive1 & pathname1 is the source file or directory, drive2 & pathname2 is the target file or directory It is similar to copy command but it also copies all the subdirectories including empty directories http://improvec.blogspot.in/ 14
- 15. External Commands (contd) Example C>XCOPY A: /S Result The above command is used to copy all files and subdirectories on the disk in drive A to the disk in the drive C http://improvec.blogspot.in/ 15
- 16. External Commands (contd) ATTRIB [+R | -R] [+A | -A] [+S | -S] [+H | -H] [drive:] [path] [filename] [/S [/D]] It displays or changes file attributes + Sets an attribute - Clears an attribute R Read-only file attribute A Archive file attribute http://improvec.blogspot.in/ 16
- 17. External Commands (contd) S System file attribute H Hidden file attribute [drive:] [path] [filename] It specifies a file for attrib to process /S Processes matching files in the current folder and all subfolders /D Processes folders as well http://improvec.blogspot.in/ 17
- 18. Summary In this class, you have learnt about External commands – FORMAT, CHKDSK, SCANDISK, XCOPY, ATTRIB, DISKCOPY, PRINT, TREE, DELTREE etc http://improvec.blogspot.in/ 18
- 19. Frequently Asked Questions 1. List any four DOS external commands 2. What is DOS external command? 3. Explain any four external commands in DOS. http://improvec.blogspot.in/ 19
- 20. Quiz C>XCOPY A: /S - This command is used to copy all files and subdirectories on the disk in a. drive A to the disk in the drive C. b. drive C to the disk in the drive A. Answer: a http://improvec.blogspot.in/ 20
- 21. Quiz The command used to copy a diskette into another a. DISKCOPY b. XCOPY Answer: a http://improvec.blogspot.in/ 21 21