--> Using Linux for about 15 years and I never knew the magic SysRq key.. It enables you to talk to your kernel more directly.
---> You can also call it PrtSc - Print screen..
'The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system's state. It is often used to recover from freezes, or to reboot a computer without corrupting the filesystem. Its effect is similar to the computer's hardware reset button (or power switch) but with many more options and much more control. '
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