dmenu/dmenu_run

#!/bin/sh
CACHE=${XDG_CACHE_HOME:-"$HOME/.cache"}/dmenu_run
if [ ! -d "`dirname "$CACHE"`" ]; then
	CACHE=$HOME/.dmenu_cache
fi
(
	IFS=:
	if test "`ls -dt $PATH "$CACHE" 2> /dev/null | sed 1q`" != "$CACHE"; then
		lsx $PATH | sort -u > "$CACHE"
	fi
)
cmd=`dmenu "$@" < "$CACHE"` && exec sh -c "$cmd"