# **Linux RunLevels report** 

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## What are RunLevels?

We can define runlevel as a system boot mode, in other words, we can choose what services and funcionalities we want in that OS session.

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There are diffrent runlevels, and they are divided by numbers:

* ### **Runlevel 0**
`sudo init 0`

This runlevel can be used to shutdown the whole system.

* ### **Runlevel 1**
`sudo init 1`

This runlevel is used only for administration, the networking and multitasking are disabled, only root can be used in this mode.

* ### **Runlevel 2**
`sudo init 2`

This runlevel has all the local users, but it doesn't have networking.

* ### **Runlevel 3**
`sudo init 3`

This runlevel has all the system's funcionalities but without the graphical interface (GUI).

* ### **Runlevel 4**
`sudo init 4`

This runlevel is used for research only.

* ### **Runlevel 5**
`sudo init 5`

This runlevel has the system working with all of its funcionalities.

* ### **Runlevel 6**
`sudo init 6`

This runlevel can be used for rebooting the system.


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**Sources:**
* http://www.tldp.org/LDP/sag/html/run-levels-intro.html
* https://linuxonfire.wordpress.com/2012/10/19/what-are-init-0-init-1-init-2-init-3-init-4-init-5-init-6-2/

Made by: Rodrigo Oliveira TIIGR0916B