marukuru-dmenu/dmenu_path

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

uptodate() {
	test -f "$CACHE" &&
	for dir in $PATH
	do
		test ! $dir -nt "$CACHE" || return 1
	done
}

if ! uptodate
then
	for dir in $PATH
	do
		cd "$dir" &&
		for file in *
		do
			test -x "$file" && echo "$file"
		done
	done | sort | uniq > "$CACHE".$$ &&
	mv "$CACHE".$$ "$CACHE"
fi

cat "$CACHE"