comm
compare two sorted files line by line
see also :
join - uniq
Synopsis
comm
[OPTION]... FILE1 FILE2
add an example, a script, a trick and tips
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.
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’.
copyright
Copyright © 2012 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.
reporting bugs
Report comm bugs to bug-coreutils[:at:]gnu[:dot:]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/>
see also
join ,
uniq
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.
author
Written by
Richard M. Stallman and David MacKenzie.