COMM(1)                         User Commands                        COMM(1)

NAME         top

       comm - compare two sorted files line by line

SYNOPSIS         top

       comm [OPTION]... FILE1 FILE2

DESCRIPTION         top

       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

              output a summary

       -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'.

EXAMPLES         top

       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.

AUTHOR         top

       Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS         top

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

COPYRIGHT         top

       Copyright © 2017 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.

SEE ALSO         top

       join(1), uniq(1)

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

COLOPHON         top

       This page is part of the coreutils (basic file, shell and text
       manipulation utilities) project.  Information about the project can
       be found at ⟨⟩.  If you have a
       bug report for this manual page, see
       ⟨⟩.  This page was obtained
       from the tarball coreutils-8.29.tar.xz fetched from
       ⟨⟩ on 2018-02-02.  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

GNU coreutils 8.29              December 2017                        COMM(1)