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pushd revision 1.6 
      1 #	$NetBSD: pushd,v 1.6 1995/03/21 09:11:04 cgd Exp $
      2 #
      3 # Copyright (c) 1991, 1993
      4 #	The Regents of the University of California.  All rights reserved.
      5 #
      6 # This code is derived from software contributed to Berkeley by
      7 # Kenneth Almquist.
      8 #
      9 # Redistribution and use in source and binary forms, with or without
     10 # modification, are permitted provided that the following conditions
     11 # are met:
     12 # 1. Redistributions of source code must retain the above copyright
     13 #    notice, this list of conditions and the following disclaimer.
     14 # 2. Redistributions in binary form must reproduce the above copyright
     15 #    notice, this list of conditions and the following disclaimer in the
     16 #    documentation and/or other materials provided with the distribution.
     17 # 3. All advertising materials mentioning features or use of this software
     18 #    must display the following acknowledgement:
     19 #	This product includes software developed by the University of
     20 #	California, Berkeley and its contributors.
     21 # 4. Neither the name of the University nor the names of its contributors
     22 #    may be used to endorse or promote products derived from this software
     23 #    without specific prior written permission.
     24 #
     25 # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28 # ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35 # SUCH DAMAGE.
     36 #
     37 #	@(#)pushd	8.1 (Berkeley) 5/31/93
     38 
     39 # pushd, popd, and dirs --- written by Chris Bertin
     40 # Pixel Computer Inc. ...!wjh12!pixel!pixutl!chris
     41 # as modified by Patrick Elam of GTRI and Kenneth Almquist at UW
     42 
     43 pushd () {
     44 	SAVE=`pwd`
     45 	if [ "$1" = "" ] 
     46 	then	if [ "$DSTACK" = "" ]
     47 		then	echo "pushd: directory stack empty."
     48 			return 1
     49 		fi
     50 		set $DSTACK
     51 		cd $1 || return
     52 		shift 1
     53 		DSTACK="$*"
     54 	else	cd $1 > /dev/null || return
     55 	fi
     56 	DSTACK="$SAVE $DSTACK"
     57 	dirs
     58 }
     59 
     60 popd () {
     61 	if [ "$DSTACK" = "" ] 
     62 	then	echo "popd: directory stack empty."
     63 		return 1
     64 	fi
     65 	set $DSTACK
     66 	cd $1
     67 	shift
     68 	DSTACK=$*
     69 	dirs
     70 }
     71 
     72 dirs () {
     73 	echo "`pwd` $DSTACK"
     74 	return 0
     75 }
     76