Another one, not quite as handy but still awesome: ctrl s / ctrl-q. This freezes/unfreezes the terminal output so you can read it, without interrupting your program. Useful for very fast walls of text.

Oh so that is what this is for. I thought ctrl-q / ctrl-s are there as a nasty way to screw with users, who every now and then accidentally press one of these, and find their terminal frozen and no longer visibly reacting to input, for no apparent reason.

I remember when the Pause key did that! It's long enough ago that I don't remember which systems did so, and most laptops don't even have a Pause key any more, but it was often very handy for reading fast-moving console output.

It can’t always not interrupt your program. Think about it: after you press Control S to trigger XOFF, the fast output has to be buffered in memory. That memory is certainly not unlimited. There’s no way for the program to keep outputting text. Indeed some programs (including Claude Code, at least a while ago) really don’t like it when you press Control S and let the terminal be frozen for a very long time.