#!/bin/bash
. opts
# export LC_ALL=C
if [ "$#" != 2 ]; then
	. usage "[comm-opts] dir1 dir2
  -1              suppress column 1 (lines unique to FILE1)
  -2              suppress column 2 (lines unique to FILE2)
  -3              suppress column 3 (lines that appear in both files)

  --check-order     check that the input is correctly sorted, even
                      if all input lines are pairable
  --nocheck-order   do not check that the input is correctly sorted
  --output-delimiter=STR  separate columns with STR"
	# I refuse to license this script under GPL
	# although I did cut and paste the above from comm --help!
	# It's public domain.
fi
a="$1" b="$2"
exec comm "${OPTS[@]}" <(find_in "$a") <(find_in "$b")