Slackware :: Sudo Does Not Allow Access To Root Commands

In order to allow me to shutdown my PC from within fluxbox without being root I ran "visudo" and added the following line:

Code:

psionl0 ALL=(ALL) NOPASSWD: ALL

A check that the line had been accepted showed all ok:

Code:

bash-4.1$ sudo -l

User psionl0 may run the following commands on this host:

(ALL) NOPASSWD: ALL

Yet when I tested it out, I got nowhere:

Code:

bash-4.1$ sudo pkgtool
sudo: pkgtool: command not found
bash-4.1$ sudo shutdown -h now
sudo: shutdown: command not found
bash-4.1$

Have I done something wrong or isn't sudo meant to be used this way?