list directory tree shell script

The shell script can be listed in the directory tree. It can show sed full advantage of the powerful pattern-matching ability.

#!/bin/sh
# dtree: Usage: dtree [any directory]
dir=${1:-.}
(cd $dir; pwd)
find $dir -type d -print | sort -f | sed -e "s,^$1,," -e "/^$/d" -e "s,[^/]*/([^/]*)$,`----1," -e "s,[^/]*/,| ,g"