COMM(1)                                                   COMM(1)

     NAME
          comm - select or reject lines common to two sorted files

     SYNOPSIS
          comm [ -123 ] file1 file2

     DESCRIPTION
          Comm reads file1 and file2, which are in lexicographical
          order, and produces a three column output: lines only in
          file1; lines only in file2; and lines in both files.  The
          file name `-' means the standard input.

          Flag `1', `2', or `3' suppresses printing of the correspond-
          ing column.

     EXAMPLE
          comm -12 file1 file2

               Print lines common to two sorted files.

     SOURCE
          /sys/src/cmd/comm.c

     SEE ALSO
          sort(1), cmp(1), diff(1), uniq(1)