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 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