[tor-relays] Traffic stats without vidalia

I've done some searching, but I can't seem to find any references to how I check the traffic stats (current b/w use, total MB passed, etc) for my node when running on a linux (CentOS 6) platform. I've built a new vps with a huge pipe that's command-line-only to maximize performance, but I'm noticing that I can't tell if it's working well without being able to view basic statistical info within that CLI environment.

Does anyone know the solution to this?

Thank you very much.