[6.3] Assigning "shutdown" to eg. Syst?

[perryh at pluto.rain.com]

> The only other thing being in group operator lets you run,
> apart from what you've added into /etc/devfs.{conf,rules} is
> /sbin/mksnap_ffs ..

In a default devfs config, it grants read permission to
the disk devices (presumably to enable running dump(8)).