Linux Basics for Big Data

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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 shutdown the system immediately

shutdown -h now

The alternative command to shutdown immediately is: "halt"

Restart the system

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

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