NAME
comm - compare two sorted files line by line  
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 lines unique to FILE1
-2
    suppress lines unique to FILE2
-3
    suppress lines that appear in both files
--help
    display this help and exit
--version
    output version information and exit

 
AUTHOR
Written by Richard Stallman and David MacKenzie.  
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.  
COPYRIGHT
Copyright © 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
SEE ALSO
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

should give you access to the complete manual.