Manual Reference Pages  - COMM (1)

NAME

comm - compare two sorted files line by line

CONTENTS

Synopsis
Description
Examples
Author
Copyright

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.

AUTHOR

Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS

Report comm bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report comm translation bugs to <http://translationproject.org/team/>

COPYRIGHT

Copyright © 2011 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 8.12.197-032bb COMM (1) September 2011
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