There are so many ways to shutdown and restart your computer. There are applets, there are also widgets you could use. However, what happens if your desktop environment freezes or what if you’re on the command line? How do you reboot or shutdown? Here are some ways:
The Halt Command
Halt! Sounds like an old word for stop. But there really is a command you could use when you want to shut down the computer. Type ‘halt’ on the command line. You might need sudo/root access for this.
Reboot!
If you want to reboot your computer, just type ‘reboot’ on the command line and you will have your computer reboot.
There’s also the shutdown command…There’s also the shutdown command…
I used to issue the shutdown command before. If it was for shutting down the computer, I’d use shutdown -h now so that it shuts down. You could also specify the time it shuts down. In my [...]

Full story: Clair Ching