1#!/bin/sh
2UP=
3DN=${PWD:?}
4TP=${TOPDIR:?}
5
6while [ ! $TP/$UP/. -ef $DN ] ;do
7	UP=`basename $PWD`/$UP
8	cd ..
9	if [ "$PWD" = "/" ]; then echo "Lost"; exit 1; fi
10done
11
12echo $UP
13exit 0
14