    COMM(I)                      5/15/74                      COMM(I)

    NAME
         comm - print lines common to two files

    SYNOPSIS
         comm [ - [ 123 ] ] file1 file2

    DESCRIPTION
         Comm  reads  file1  and  file2, which should be in sort, and
         produces a three column output: lines only in  file1;  lines
         only  in  file2;  and lines in both files.  The filename `-'
         means the standard input.

         Flags 1, 2, or 3 suppress printing of the corresponding col-
         umn.   Thus comm -12 prints only the lines common to the two
         files; comm -23 prints only lines in the first file but  not
         in the second; comm -123 is a no-op.

    SEE ALSO
         cmp(I), diff(I)

    BUGS

                                  - 1 -