another pushd/popd for sh

[chris]

   I have seen several pushd/popd for the shell, lately, but they don't
behave like the Cshell's. This one looks to the user like the 4.1 version
(it doesn't have the '+n' option).
				----------

DSTACK=''

pushd(){
	SAVE=`pwd`
	DSTACK="$SAVE $DSTACK"
	if [ "$1" = "" ] ; then
		if [ "$DSTACK" = "$SAVE " ] ; then
			echo "pushd: No other directory"
			DSTACK=""
			return 1
		fi
		set $DSTACK
		cd $2
		shift
		shift
		DSTACK="$SAVE $*"
	else
		if (cd $1) ; then
			cd $1 >&-
		else
			popd > /dev/null
			return 1
		fi
	fi
	dirs
	return 0
}

popd(){
	if [ "$DSTACK" = "" ] ; then
		echo "popd: Directory stack empty"
		return 1
	fi
	set $DSTACK
	cd $1
	shift
	DSTACK=$*
	dirs
	return 0
}

dirs(){
	echo "`pwd` $DSTACK"
	return 0
}
-- 

 Chris Bertin            :         (617) 657-8720 x2318
 Pixel Computer Inc.     :
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