Provided by: coreutils_8.25-2ubuntu2_i386 bug


       comm - compare two sorted files line by line


       comm [OPTION]... FILE1 FILE2


       Compare sorted files FILE1 and FILE2 line by line.

       When FILE1 or FILE2 (not both) is -, read standard input.

       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

       -z, --zero-terminated
              line delimiter is NUL, not newline

       --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.


       GNU coreutils online help: <>
       Report comm translation bugs to <>


       Copyright © 2016 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 permitted by law.


       join(1), uniq(1)

       Full documentation at: <>
       or available locally via: info '(coreutils) comm invocation'