Red Hat – Run Levels

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So Linux has this concept of run levels.  Basically, a run level represents the state of the machine.  Here’s a quick list of the run levels available.

Run Level

Name

Description

0

Halt Immediately shuts down the system

1

Single User Context Brings system into single user mode for maintenance

2

User Defined N/A

3

Multi-User Console only System up and running normally in console mode

4

User Defined N/A

5

Multi-User with GUI and console System up and running normally in console or GUI mode

6

Reboot Immediately reboots the system

 

So if you want to shutdown the system you can issue a ‘init 0’.  Same goes for a reboot (init 6).  To set what you want the machine to do on boot you can change the initdeafult command in /etc/inittab to reflect the run level you want on boot.  Usually this only changes between 3 and 5 as far as I can tell. 

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