how do I shutdown, install updates, and reboot?

I am getting a lot of confusing stuff about this out
there on Google, so I thought I’d just ask.

I have a ws03 server. I want to do the following,
from the command line (scheduled tasks):

1) shutdown the computer
2) install any Microsoft updates that are pending
3) automatically restart the computer

Has to be all unattended (scheduled tasks).

Many thanks,
-T