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