marukuru-dmenu/dmenu_path

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

uptodate() {
	test ! -f $CACHE && return 1
	for dir in $PATH
	do
		test $dir -nt $CACHE && return 1
	done
	return 0
}

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

cat $CACHE