popd revision 4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 
1#	$NetBSD: popd,v 1.7 1995/05/11 21:31:13 christos Exp $
2# Copyright (c) 1991, 1993
3#	The Regents of the University of California.  All rights reserved.
4#
5# This code is derived from software contributed to Berkeley by
6# Kenneth Almquist.
7#
8# Redistribution and use in source and binary forms, with or without
9# modification, are permitted provided that the following conditions
10# are met:
11# 1. Redistributions of source code must retain the above copyright
12#    notice, this list of conditions and the following disclaimer.
13# 2. Redistributions in binary form must reproduce the above copyright
14#    notice, this list of conditions and the following disclaimer in the
15#    documentation and/or other materials provided with the distribution.
16# 3. All advertising materials mentioning features or use of this software
17#    must display the following acknowledgement:
18#	This product includes software developed by the University of
19#	California, Berkeley and its contributors.
20# 4. Neither the name of the University nor the names of its contributors
21#    may be used to endorse or promote products derived from this software
22#    without specific prior written permission.
23#
24# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34# SUCH DAMAGE.
35#
36#	@(#)popd	8.2 (Berkeley) 5/4/95
37
38# pushd, popd, and dirs --- written by Chris Bertin
39# Pixel Computer Inc. ...!wjh12!pixel!pixutl!chris
40# as modified by Patrick Elam of GTRI and Kenneth Almquist at UW
41
42pushd () {
43	SAVE=`pwd`
44	if [ "$1" = "" ] 
45	then	if [ "$DSTACK" = "" ]
46		then	echo "pushd: directory stack empty."
47			return 1
48		fi
49		set $DSTACK
50		cd $1 || return
51		shift 1
52		DSTACK="$*"
53	else	cd $1 > /dev/null || return
54	fi
55	DSTACK="$SAVE $DSTACK"
56	dirs
57}
58
59popd () {
60	if [ "$DSTACK" = "" ] 
61	then	echo "popd: directory stack empty."
62		return 1
63	fi
64	set $DSTACK
65	cd $1
66	shift
67	DSTACK=$*
68	dirs
69}
70
71dirs () {
72	echo "`pwd` $DSTACK"
73	return 0
74}
75