shell output history in screen(1)

We all know the great things screen can do for a sysadmin – you can detach running process and come back to see it anytime.

But if you want to see what was happening while you were gone, you need to browse the history of the shell process.

It’s simple, CTRL+A [. That means CTRL+A to enter command mode, then release it and press character “[“.

More in detail here.