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How to use Magic System Request Keys in Ubuntu Linux -- Ubuntu Geek
by tadeufilippini (via)
The magic SysRq keys are key combinations within the Linux kernel that allows the user to perform various low level commands regardless of the system’s state, except during kernel panics or freezes. It is often used to recover from X-Server freezes, or to reboot a computer without corrupting the filesystem.
Restarting Ubuntu safely when it is frozen
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