marukuru-dmenu/dmenu_path

#!/bin/sh -f
CACHE=$HOME/.dmenu_cache
IFS=:

qfind() {
	find "$@" 2>/dev/null
}

uptodate() {                                                                       
	test -f $CACHE &&
		test "$(echo "$PATH")" = "$(sed 1q "$CACHE")" &&
		! qfind $PATH -maxdepth 0 -newer $CACHE >/dev/null
}

if ! uptodate
then
	{
		echo "$PATH"
		qfind $PATH -type f -maxdepth 1 '(' -perm -u+x -o -perm -g+x -o -perm -o+x ')' |
			sed 's,.*/,,' | sort | uniq
	}
	mv $CACHE.$pid $CACHE
fi

tail -n +2 $CACHE