sh/funcs/pushd

   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 }