#! /bin/sh
#
#	@(#)dirname.sh 1.5 89/03/22 SMI; from S5R2 1.2
#
PATH=/bin:/usr/bin
expr \
  ${1-.}'/' : '\(/\)[^/]*//*$' \
  \| ${1-.}'/' : '\(.*[^/]\)//*[^/][^/]*//*$' \
  \| .