[CentOS] yum update in background

> thing is, i need to learn how to make a new screen and be able to attach
> back to it as i wasnt able o attach to this one even though it was still
> there till done and went away.

"screen -r" to reattach or "screen -d -r" to detach another connection and 
reattach here.

Cheers,
MaZe.