Initial import from FreeBSD RELENG_4:
[dragonfly.git] / bin / sh / funcs / popd
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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# @(#)popd 8.2 (Berkeley) 5/4/95
36# $FreeBSD: src/bin/sh/funcs/popd,v 1.6 1999/08/27 23:15:35 peter Exp $
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}