4 # Copyright (c) 1991, 1993
5 # The Regents of the University of California. All rights reserved.
7 # This code is derived from software contributed to Berkeley by
10 # Redistribution and use in source and binary forms, with or without
11 # modification, are permitted provided that the following conditions
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 # 3. 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.
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
34 # @(#)popd 8.2 (Berkeley) 5/4/95
36 # pushd, popd, and dirs --- written by Chris Bertin
37 # Pixel Computer Inc. ...!wjh12!pixel!pixutl!chris
38 # as modified by Patrick Elam of GTRI and Kenneth Almquist at UW
43 then if [ "$DSTACK" = "" ]
44 then echo "pushd: directory stack empty."
51 else cd $1 > /dev/null || return
53 DSTACK="$SAVE $DSTACK"
59 then echo "popd: directory stack empty."