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pushd revision 1.7 
      1 #	$NetBSD: pushd,v 1.7 1995/05/11 21:31:15 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 #	@(#)pushd	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 
     42 pushd () {
     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 $DSTACK"
     56 	dirs
     57 }
     58 
     59 popd () {
     60 	if [ "$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 
     71 dirs () {
     72 	echo "`pwd` $DSTACK"
     73 	return 0
     74 }
     75