usr/src/bin/sh/funcs/pushd

# Copyright (c) 1991 The Regents of the University of California.
# All rights reserved.
#
# This code is derived from software contributed to Berkeley by
# Kenneth Almquist.
#
# %sccs.include.redist.sh%
#
#       @(#)pushd       5.1 (Berkeley) %G%

# 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
}