.\" @(#)comm.1 6.1 (Berkeley) %G%
comm \- select or reject lines common to two sorted files
which should be ordered in ASCII collating sequence,
and produces a three column output: lines only in
The filename `\-' means the standard input.
Flags 1, 2, or 3 suppress printing of the corresponding
prints only the lines common to the two files;
prints only lines in the first file but not in the second;