BSD 4_4 release

[unix-history] / usr / src / usr.bin / diff / diff3 / diff3.sh

#!/bin/sh -
#
# Copyright (c) 1991, 1993
#       The Regents of the University of California.  All rights reserved.
#
# This module is believed to contain source code proprietary to AT&T.
# Use and redistribution is subject to the Berkeley Software License
# Agreement and your Software Agreement with AT&T (Western Electric).
#
#       @(#)diff3.sh    8.1 (Berkeley) 6/6/93
#

e=
case $1 in
-*)
       e=$1
       shift;;
esac
if test $# = 3 -a -f $1 -a -f $2 -a -f $3
then
       :
else
       echo usage: diff3 file1 file2 file3 1>&2
       exit
fi
trap "rm -f /tmp/d3[ab]$$" 0 1 2 13 15
diff $1 $3 >/tmp/d3a$$
diff $2 $3 >/tmp/d3b$$
/usr/libexec/diff3 $e /tmp/d3[ab]$$ $1 $2 $3