comm(1)

     NAME
          comm - compare two sorted files line by line

     SYNOPSIS
          comm [-123] [--help] [--version] file1 file2

     DESCRIPTION
          This documentation is no longer being maintained and may be
          inaccurate or incomplete.  The Texinfo documentation is now
          the authoritative source.

          This manual page documents the GNU version of comm.  comm
          prints lines that are common, and lines that are unique, to
          two input files.  The two files must be sorted before comm
          can be used.  The file name `-' means the standard input.

          With no options, comm produces 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.

        OPTIONS
          The options -1, -2, and -3 suppress printing of the
          corresponding columns.

          --help
               Print a usage message and exit with a status code
               indicating success.

          --version
               Print version information on standard output then exit.