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Linux Magic SysRq + R S E I V B key chord will immediately shut down while still properly flushing disk cache and such. A bit annoying to enter, but a handy tool to have in your toolbox.

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That's not the right keys and not the right order to do that. You should not flush caches before you terminated as much processes as possible correctly. And you are rebooting at the end.

REISUB for a somewhat safe EMERGENCY reboot and O instead of B at the end for shutdown.

Oh hmm, you're right. I've always done it with the other order and never had problems. Forget where I learned it that way...

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