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dirs revision 1.4 
      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 #	@(#)dirs	8.1 (Berkeley) 5/31/93
     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 
     41 pushd () {
     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 $DSTACK"
     55 	dirs
     56 }
     57 
     58 popd () {
     59 	if [ "$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 
     70 dirs () {
     71 	echo "`pwd` $DSTACK"
     72 	return 0
     73 }
     74