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popd revision 1.8 
      1 #	$NetBSD: popd,v 1.8 2016/02/29 23:50:59 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 #
     17 # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     18 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20 # ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     21 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27 # SUCH DAMAGE.
     28 #
     29 #	@(#)popd	8.2 (Berkeley) 5/4/95
     30 
     31 # pushd, popd, and dirs --- written by Chris Bertin
     32 # Pixel Computer Inc. ...!wjh12!pixel!pixutl!chris
     33 # as modified by Patrick Elam of GTRI and Kenneth Almquist at UW
     34 
     35 pushd () {
     36 	SAVE=`pwd`
     37 	if [ "$1" = "" ] 
     38 	then	if [ "$DSTACK" = "" ]
     39 		then	echo "pushd: directory stack empty."
     40 			return 1
     41 		fi
     42 		set $DSTACK
     43 		cd $1 || return
     44 		shift 1
     45 		DSTACK="$*"
     46 	else	cd $1 > /dev/null || return
     47 	fi
     48 	DSTACK="$SAVE $DSTACK"
     49 	dirs
     50 }
     51 
     52 popd () {
     53 	if [ "$DSTACK" = "" ] 
     54 	then	echo "popd: directory stack empty."
     55 		return 1
     56 	fi
     57 	set $DSTACK
     58 	cd $1
     59 	shift
     60 	DSTACK=$*
     61 	dirs
     62 }
     63 
     64 dirs () {
     65 	echo "`pwd` $DSTACK"
     66 	return 0
     67 }
     68