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COMM(1)                          User Commands                         COMM(1)

       comm - compare two sorted files line by line

       comm [OPTION]... FILE1 FILE2

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

              do not check that the input is correctly sorted

              separate columns with STR

       --help display this help and exit

              output version information and exit

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

       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.

       Written by Richard M. Stallman and David MacKenzie.

       Report comm bugs to
       GNU coreutils home page: <>;
       General help using GNU software: <>;
       Report comm translation bugs to <>;

       Copyright  (C)  2010  Free  Software  Foundation,  Inc.   License  GPLv3+:   GNU   GPL   version   3   or   later
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permit-
       ted by law.

       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 8.4                 March 2017                           COMM(1)