Scrollback / Terminal History in screen or byobu

This is another case of “should have read the manual”, but there are ways to see previous output in both screen and byobu.

In screen: ctrl + a + [
In byobu: F7

These key combinations cause screen/byobu to enter copy mode, where you can navigate using vi keys, can set marks for copying using return and the like.

This should have been blindingly obvious, but I guess years ago I got used to using screen without scrollback. There more you know… the more it seems that you don’t know anything at all.