[apple/shell_cmds.git] / sh / funcs / pushd

#!/bin/sh

#-
# Copyright (c) 1991, 1993
#	The Regents of the University of California.  All rights reserved.
#
# This code is derived from software contributed to Berkeley by
# Kenneth Almquist.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 4. Neither the name of the University nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#	@(#)pushd	8.2 (Berkeley) 5/4/95
# $FreeBSD$

# pushd, popd, and dirs --- written by Chris Bertin
# Pixel Computer Inc. ...!wjh12!pixel!pixutl!chris
# as modified by Patrick Elam of GTRI and Kenneth Almquist at UW

pushd () {
	SAVE=`pwd`
	if [ "$1" = "" ] 
	then	if [ "$DSTACK" = "" ]
		then	echo "pushd: directory stack empty."
			return 1
		fi
		set $DSTACK
		cd $1 || return
		shift 1
		DSTACK="$*"
	else	cd $1 > /dev/null || return
	fi
	DSTACK="$SAVE $DSTACK"
	dirs
}

popd () {
	if [ "$DSTACK" = "" ] 
	then	echo "popd: directory stack empty."
		return 1
	fi
	set $DSTACK
	cd $1
	shift
	DSTACK=$*
	dirs
}

dirs () {
	echo "`pwd` $DSTACK"
	return 0
}
Commit	Line	Data
71aad674 A	1	#!/bin/sh
	2
	3	#-
	4	# Copyright (c) 1991, 1993
	5	# The Regents of the University of California. All rights reserved.
	6	#
	7	# This code is derived from software contributed to Berkeley by
	8	# Kenneth Almquist.
	9	#
	10	# Redistribution and use in source and binary forms, with or without
	11	# modification, are permitted provided that the following conditions
	12	# are met:
	13	# 1. Redistributions of source code must retain the above copyright
	14	# notice, this list of conditions and the following disclaimer.
	15	# 2. Redistributions in binary form must reproduce the above copyright
	16	# notice, this list of conditions and the following disclaimer in the
	17	# documentation and/or other materials provided with the distribution.
	18	# 4. Neither the name of the University nor the names of its contributors
	19	# may be used to endorse or promote products derived from this software
	20	# without specific prior written permission.
	21	#
	22	# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	# SUCH DAMAGE.
	33	#
	34	# @(#)pushd 8.2 (Berkeley) 5/4/95
	35	# $FreeBSD$
	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	}