dirs revision 1557 
1# Copyright (c) 1991, 1993
2#	The Regents of the University of California.  All rights reserved.
3#
4# This code is derived from software contributed to Berkeley by
5# Kenneth Almquist.
6#
7# Redistribution and use in source and binary forms, with or without
8# modification, are permitted provided that the following conditions
9# are met:
10# 1. Redistributions of source code must retain the above copyright
11#    notice, this list of conditions and the following disclaimer.
12# 2. Redistributions in binary form must reproduce the above copyright
13#    notice, this list of conditions and the following disclaimer in the
14#    documentation and/or other materials provided with the distribution.
15# 3. All advertising materials mentioning features or use of this software
16#    must display the following acknowledgement:
17#	This product includes software developed by the University of
18#	California, Berkeley and its contributors.
19# 4. Neither the name of the University nor the names of its contributors
20#    may be used to endorse or promote products derived from this software
21#    without specific prior written permission.
22#
23# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33# SUCH DAMAGE.
34#
35#	@(#)dirs	8.1 (Berkeley) 5/31/93
36
37# pushd, popd, and dirs --- written by Chris Bertin
38# Pixel Computer Inc. ...!wjh12!pixel!pixutl!chris
39# as modified by Patrick Elam of GTRI and Kenneth Almquist at UW
40
41pushd () {
42	SAVE=`pwd`
43	if [ "$1" = "" ] 
44	then	if [ "$DSTACK" = "" ]
45		then	echo "pushd: directory stack empty."
46			return 1
47		fi
48		set $DSTACK
49		cd $1 || return
50		shift 1
51		DSTACK="$*"
52	else	cd $1 > /dev/null || return
53	fi
54	DSTACK="$SAVE $DSTACK"
55	dirs
56}
57
58popd () {
59	if [ "$DSTACK" = "" ] 
60	then	echo "popd: directory stack empty."
61		return 1
62	fi
63	set $DSTACK
64	cd $1
65	shift
66	DSTACK=$*
67	dirs
68}
69
70dirs () {
71	echo "`pwd` $DSTACK"
72	return 0
73}
74