cmp (Unix)

cmp (Unix)

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.

Contents

Switches

cmp may be qualified by the use of command-line switches. The switches supported by the GNU version of cmp are:

-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


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