comm - compare two sorted files line by line
[-123] [--help] [--version] file1 file2
This manual page
documents the GNU version of
prints lines that are common, and lines that are unique, to two input
files. The two files must be sorted before
can be used. The file name `-' means the standard input.
With no options,
produces three column output. Column
one contains lines unique to
column two contains
lines unique to
and column three contains lines common to both files.
suppress printing of the corresponding columns.
Print a usage message and exit with a status code indicating success.
Print version information on standard output then exit.