The most consistent way to shut down a Unix system properly via the command line is to use one of the following commands −
| Command | Description |
|---|
| halt | Brings the system down immediately. |
| init 0 | Powers off the system using predefined scripts to synchronize and clean up the system prior to shutdown |
| init 6 | Reboots the system by shutting it down completely and then bringing it completely back up |
| poweroff | Shuts down the system by powering off. |
| reboot | Reboots the system. |
| shutdown | Shuts down the system. |
You typically need to be the superuser or root (the most privileged account on a Unix system) to shut down the system, but on some standalone or personally owned Unix boxes, an administrative user and sometimes regular users can do so.
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