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Special System commands

sudo

This command makes a program run as root (the system administrator). This command is only allowed to be used by few users. Such users are called sudoers. You can modify the sudoers using

sudo visudo

shutdown

This command makes the system shutdown. You can use the following command to shut down the system immediately

shutdown -h now

The alternative command to shutdown immediately is: halt

Restart the system

To restart the system, you can use the reboot command.

Please note that above commands (shutdown, halt, reboot) can only be run as root.


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