WiFi Help through shell

So as a graduation gift (:D) I was given a laptop... But not just a laptop a OLPC (laptop.org) and I'm trying to access my local LAN but because of security issues and compatibility issues I opted to drop the wpa and wep for a hidden SSID (I monitor it closely and change the SSID regularly).

So the built in network viewer doesn't see my LAN so I decided to do it through the shell but I haven't seen any good articles concerning this topic (probably because its a simple thing to do)

Although I probably didn't need to explain it I did anyways, sorry for wasting your time, but can you help?