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Magic SysRq key (PrtSc) + REISUB gives you a fast and safe kernel landing..

- unRaw (take control of keyboard back from X),
- tErminate (send SIGTERM to all processes, allowing them to terminate gracefully),
- kIll (send SIGKILL to all processes, forcing them to terminate immediately),
- Sync (flush data to disk),
- Unmount (remount all filesystems read-only),
- reBoot.

Nice!
Although I need REISUO -> shutdOwn instead of reBoot

ALT + PrtSc + REISUO
(keep alt pressed)

I use it to safely shutdown a Raspberry Pi whilst a script is running activated via system.d and when I can't ssh to the Pi.

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