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# The "magic SysRq key" provides a way to send commands
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# directly to the kernel through the /proc filesystem
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# kernel documentation: https://www.mjmwired.net/kernel/Documentation/sysrq.txt
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# using keyboard: Alt-SyqRq-KEY
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# activate the magic SysRq option (root)
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echo 1 > /proc/sys/kernel/sysrq
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# activate the magic SysRq option (sudo)
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echo 1 | suto tee /proc/sys/kernel/sysrq
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# permanently activate sysrq
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echo "kernel.sysrq = 1" >> /etc/sysctl.conf
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# k – Kills all the process running on the current virtual console.
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# s – This will attempt to sync all the mounted file system.
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# b – Immediately reboot the system, without unmounting partitions or syncing.
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# e – Sends SIGTERM to all process except init.
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# m – Output current memory information to the console.
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# i – Send the SIGKILL signal to all processes except init
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# r – Switch the keyboard from raw mode
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# (the mode used by programs such as X11), to XLATE mode.
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# s – sync all mounted file system.
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# t – Output a list of current tasks and their information to the console.
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# u – Remount all mounted filesystems in readonly mode.
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# o – Shutdown the system immediately.
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# p – Print the current registers and flags to the console.
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# 0-9 – Sets the console log level, controlling which kernel messages will be
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# printed to your console.
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# f – Will call oom_kill to kill process which takes more memory.
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# h – Used to display the help (any key except the listed above will print help)
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