comm - compare two sorted files line by line


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 lines unique to FILE1
-2 suppress lines unique to FILE2
-3 suppress 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


Written by Richard M. Stallman and David MacKenzie.


Report comm bugs to GNU coreutils home page: <> General help using GNU software: <>


Copyright © 2009 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.


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.

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