Force linux to shutdown or restart

A solution for your PC when feel lag and freeze

Sometimes restart PC with

ctrl + alt + delete

not working and you should to press the power button but this is not recommended because can damage computer performance

Usually I use this way to resolve that:
Holding down

ALT + PrntSct/SysRq

(which is the Print Screen key) while slowly typing

R+E+I+S+U+B

will get you safely restarted.

R+E+I+S+U+O

will do a shutdown rather than a restart.

Here are the steps each button performs:

• R: Switch the keyboard from raw mode to XLATE mode
• E: Send the SIGTERM signal to all processes except init
• I: Send the SIGKILL signal to all processes except init
• S: Sync all mounted filesystems
• U: Remount all mounted filesystems in read-only mode
• B: Immediately reboot the system, without unmounting partitions or syncing

source codepolitan blog.kember.net