Raspberry Pi: SysRq magic to reboot or shutdown headless

Based on this and this articles.

Ellipses below are short delays of a few seconds – to let your machine complete system requests after pressing the letters.

Hold Alt+SysRq and press one by one with small pauses r…e…i…s…u…b/o, b – for reboot, o – for shutdown.

Depending on your keyboard – say, it’s German, and the Right Alt is AltGr actually, then the Alt should be the Left Alt.

If SysRq is missing on your keyboard – try PrintScreen instead. The PrintScreen on multimedia keyboards sometimes is accessible in combination with a Fn button.

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