cmp is a command line utility for computer systems that use Unix or a Unix-like operating system. It compares two files of any type and writes the results to the standard output. By default, cmp is silent if the files are the same; if they differ, the byte and line number at which the first difference occurred is reported.
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Switches
cmp may be qualified by the use of the following command-line switches, (the long versions are in brackets):
-b, --print-bytes- Print differing bytes.
-i SKIP, --ignore-initial=SKIP- Skip the first SKIP bytes of input.
-i SKIP1:SKIP2, --ignore-initial=SKIP1:SKIP2- Skip the first SKIP1 bytes of FILE1 and the first SKIP2 bytes of FILE2.
-l, --verbose- Output byte numbers and values of all differing bytes.
-n LIMIT, --bytes=LIMIT- Compare at most LIMIT bytes.
-s, --quiet, --silent- Output nothing; yield exit status only.
-v, --version- Output version info.
--help- Outputs a help file.
Return values
- 0 - files are identical
- 1 - files differ
- 2 - inaccessible or missing argument
See also
References
External links
- Comparing and Merging Files: Invoking cmp The section of the manual of GNU cmp in the diffutils free manual.
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