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How to shut down a computer using Command Prompt

In this video you will learn how to shut down a computer using this command:
shutdown -s -f -t 120 -c "Hello", where:
-s means shutdown
-f - force shutdown
-t - the time in which the computer will shutdown, for instance 120 seconds
-c - a comment that will appear to the user, e.g. "hello"
In order to abort, start cmd.exe and type shutdown - a
You can write the command in a notepad file and save it as whatever.bat. Further, you can change its location, icon or name in order to fool people it's a virus. However, remember to use this command to shutdown only your own PC and not to send it to your friends!
The command works in Windows XP, Vista and 7, only the message box that appears when clicking the file looks different. Enjoy!