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Command+Shift+4 on mac. And on Ubuntu there was something too, but I’ve forgotten the combo

Shift+PrintScreen. It freezes the screen and lets you draw a rectangle over the area you want to capture.

> It freezes the screen and lets you draw a rectangle over the area you want to capture.

This is what Windows 10 does when you hit print screen on its own (as of a recent'ish update).

Then there's also:

alt + print screen to automatically capture the focused window.

And ctrl + print screen to capture all monitors instead of the focused window.