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/bin/sh/funcs/popd

https://bitbucket.org/freebsd/freebsd-head/
Shell | 73 lines | 31 code | 5 blank | 37 comment | 5 complexity | c39945a829764f5875ec6cbf84d65f27 MD5 | raw file
 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#	@(#)popd	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
41pushd () {
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 $DSTACK"
55	dirs
56}
57
58popd () {
59	if [ "$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
70dirs () {
71	echo "`pwd` $DSTACK"
72	return 0
73}