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COMM(1)                                   User Commands                                   COMM(1)



NAME
       comm - compare two sorted files line by line

SYNOPSIS
       comm [OPTION]... FILE1 FILE2

DESCRIPTION
       Compare sorted files FILE1 and FILE2 line by line.

       With  no options, produce three-column output.  Column one contains lines unique to FILE1,
       column two contains lines unique to FILE2, and column three contains lines common to  both
       files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

       --check-order
              check that the input is correctly sorted, even if all input lines are pairable

       --nocheck-order
              do not check that the input is correctly sorted

       --output-delimiter=STR
              separate columns with STR

       --help display this help and exit

       --version
              output version information and exit

       Note, comparisons honor the rules specified by 'LC_COLLATE'.

EXAMPLES
       comm -12 file1 file2
              Print only lines present in both file1 and file2.

       comm -3 file1 file2
              Print lines in file1 not in file2, and vice versa.

       GNU  coreutils  online help: <http://www.gnu.org/software/coreutils/> Report comm transla-
       tion bugs to <http://translationproject.org/team/>

AUTHOR
       Written by Richard M. Stallman and David MacKenzie.

COPYRIGHT
       Copyright (C) 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL  version  3  or
       later <http://gnu.org/licenses/gpl.html>.
       This  is free software: you are free to change and redistribute it.  There is NO WARRANTY,
       to the extent permitted by law.

SEE ALSO
       join(1), uniq(1)

       The full documentation for comm is maintained as a Texinfo manual.  If the info  and  comm
       programs are properly installed at your site, the command

              info coreutils 'comm invocation'

       should give you access to the complete manual.



GNU coreutils 8.22                        November 2016                                   COMM(1)

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