shell_cmds-198.tar.gz

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

diff --git a/sh/funcs/pushd b/sh/funcs/pushd
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+#!/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
+}