/usr/bin/dmenu_run is in suckless-tools 40-1+deb8u2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #!/bin/sh
cachedir=${XDG_CACHE_HOME:-"$HOME/.cache"}
if [ -d "$cachedir" ]; then
cache=$cachedir/dmenu_run
else
cache=$HOME/.dmenu_cache # if no xdg dir, fall back to dotfile in ~
fi
(
IFS=:
if stest -dqr -n "$cache" $PATH; then
stest -flx $PATH | sort -u | tee "$cache" | dmenu "$@"
else
dmenu "$@" < "$cache"
fi
) | ${SHELL:-"/bin/sh"} &
|