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# @(#)pushd 8.1 (Berkeley) 5/31/93 36# $Id$ 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