comp (command)

In computing, comp is a command used on DEC OS/8,[1] DOS,[2] DR FlexOS,[3] IBM OS/2,[4] Microsoft Windows[5] and related computer operating systems such as ReactOS. It is used to perform comparisons of multiple computer files to show the differences between them.[6]

comp
The ReactOS comp command
Developer(s)DEC, IBM, Microsoft, Digital Research, Novell, Paul Vojta, ReactOS Contributors
Initial releaseAugust 1981 (1981-08)
Operating systemOS/8, PC DOS, MS-DOS, FlexOS, SISNE plus, OS/2, Windows, DR DOS, FreeDOS, ReactOS
TypeCommand
LicenseFreeDOS: MIT
ReactOS: GNU GPL 2

History
COMP.COM in IBM PC DOS 1.0

In DOS, the comp command first appeared in PC DOS 1.0[7] and has been included in most versions of MS-DOS and PC DOS. A newer command, fc was added in DOS 3.3 which allows for line comparisons in addition to binary comparisons. DR DOS 6.0 also includes an implementation of the comp command.[8]

The FreeDOS version was developed by Paul Vojta and is licensed under the MIT License.[9] Ged Murphy developed the ReactOS version. It is licensed under the GNU GPL 2.[10]

The command is also available in the EFI shell.[11]

Syntax

The command-syntax is:[12]

comp [<Data1>] [<Data2>] [/d] [/a] [/l] [/n=<Number>] [/c]

Parameters
  • <Data1> – Location and name of the first file or set of files
  • <Data2> – Location and name of the second file or set of files
  • /d – Display differences in decimal format (Default is hexadecimal)
  • /a – Display differences as characters
  • /l – Display the number of the line, instead of the byte offset
  • /n=<Number> – Compare only the specified number of lines for each file
  • /c – Perform a non case-sensitive comparison
  • /off[line] – Process files with the offline attribute set
  • /? – Display Help
gollark: NEVER!
gollark: You could argue that the reason my phones have problems is that I just don't treat them very well, but really, it's a utility device for my benefit, and I'm not going to go around trying to treat it with reverence, avoid taking it to places it might be damaged, and never using it, to try and protect it.
gollark: The circuitry, I think some of the frame, and any high-temperature parts, can't be printed.
gollark: You can't 3D print an *entire* 3D printer yet.
gollark: And my 4D printer broke.

See also

References
  1. "Concise Command Language" (CCL)."OS/8 Handbook" (PDF). April 1974. Retrieved 28 November 2017.
  2. Jamsa, Kris A. (1993), DOS: The Complete Reference, Osborne McGraw-Hill, p. 206, ISBN 0078819040.
  3. http://www.bitsavers.org/pdf/digitalResearch/flexos/1073-2003_FlexOS_Users_Guide_V1.3_Nov86.pdf
  4. "Archived copy". Archived from the original on 2019-04-14. Retrieved 2019-07-20.CS1 maint: archived copy as title (link)
  5. https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-xp/bb490883(v%3dtechnet.10)
  6. Wolverton, Van (2003). Running MS-DOS Version 6.22 (20th Anniversary Edition), 6th Revised edition. Microsoft Press. ISBN 0-7356-1812-7.
  7. http://www.bitsavers.org/pdf/ibm/pc/dos/6172220_DOS_1.0_Jan82.pdf
  8. "DR DOS 6.0 User Guide Optimisation and Configuration Tips" (PDF). Archived from the original (PDF) on 2019-09-30. Retrieved 2019-08-13.
  9. http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.2/repos/pkg-html/comp.html
  10. https://github.com/reactos/reactos/blob/master/base/applications/cmdutils/comp/comp.c
  11. "EFI Shells and Scripting". Intel. Retrieved 2013-09-25.
  12. MS-DOS and Windows command line comp command

Further reading
  • Cooper, Jim (2001). Special Edition Using MS-DOS 6.22, Third Edition. Que Publishing. ISBN 978-0789725738.
  • Dyson, Peter (1995). Mastering OS/2 Warp. Sybex. ISBN 978-0782116632.
  • Stanek, William R. (2008). Windows Command-Line Administrator's Pocket Consultant, 2nd Edition. Microsoft Press. ISBN 978-0735622623.
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