In the Rare Event that it Freezes

Difficulty:
Very Easy
Average rating:
This article teaches you how to soft reboot a "hang" Linux computer safely without having to touch that power/reset button.
So, you have tweaked something in your Linux kernel/driver and miraculously caused it to crash. Nothing you have entered seems to work. It just "hanged" there. Before you start to reach for the power/reset button and risk causing more problems to your machine, do the following.
Step 1:

Hold down the keys Alt and PrintScrn/SysRq.

Step 2:

While holding down the Alt and SysRq keys (there will be no visible output), type the following keys (in this order, one by one): R, E, I, S, U, B. The system will reboot after the last letter B is typed. 

Each letter does a particular command and REISUB combined will enable a safe reboot. (It is not as safe as a normal reboot, but it's far better than pushing that power button.)

Step 3:

The screen will go black and the system reboots.

This is a second to last resort (last being pushing that power button) for rebooting your computer. Do not use it if you can afford a normal reboot.
Required Tools:
A hanged Linux computer
Useful Links:
Magic SysRq key - Wikipeda

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