Ctrl-S hang Terminal

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It happened to me a lot many times. While working on terminal, sometime the terminal hangs due to pressing Ctrl-S.

Ctrl-S and Ctrl-Q have been around since the days of green-screens and dumb terminals (aka the 80s). Ctrl-S is scroll-lock on, and Ctrl-Q is scroll lock off. This works in a lot of places on a lot of operating systems. Try it when booting or shutting down at a text screen. Chances are Ctrl-S will stop the scrolling messages. When done, press Ctrl-Q to continue.

To resume the terminal press Ctrl-Q.