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) 2011 Free Software Foundation, Inc.  License GPLv3+:  GNU
       GPL version 3 or later <>.
       This  is  free  software:  you  are free to change and redistribute it.

GNU coreutils 8.12.197-032bb    September 2011                         COMM(1)
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