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| "Init is the father of all [[process]]es. Its primary role is to create processes from a script stored in the file <code>/etc/inittab</code>. This file usually has entries which cause init to spawn [[getty]]s on each line that users can log in. It also controls autonomous processes required by any particular system. A run level is a software configuration of the system which allows only a selected group of processes to exist. The processes spawned by init for each of these run levels are defined in the /etc/inittab file.
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|– manual page for Init<ref name="man_init">[http://man.he.net/man8/init init<!-- Bot generated title -->]</ref>
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Init's job is "to get everything running the way it should be" <ref name="p2b_6">[http://axiom.anu.edu.au/~okeefe/p2b/power2bash/power2bash-6.html From Power Up To Bash Prompt: Init<!-- Bot generated title -->]</ref> once the kernel is fully running. Essentially it establishes and operates the entirety of [[user space]]. This includes checking and mounting [[file system]]s, starting up necessary user services, and ultimately switching to a user-based environment when system startup is completed. It is similar to the [[Unix]] and [[BSD]] init processes, from which it derived, but in some cases has diverged or become customized. In a standard Linux system, Init is executed with a parameter, known as a [[runlevel]], that takes a value from 1 to 6, and that determines which subsystems are to be made operational. Each runlevel has its own [[script]]s which codify the various processes involved in setting up or leaving the given runlevel, and it is these scripts which are referenced as necessary in the boot process. Init scripts are typically held in directories with names such as <code>"/etc/rc..."</code>. The top level configuration file for init is at <code>/etc/inittab</code>.<ref name="p2b_6" />
During system boot, it checks whether a default runlevel is specified in /etc/inittab, and requests the runlevel to enter via the system [[console]] if not. It then proceeds to run all the relevant boot scripts for the given runlevel, including loading [[module]]s, checking the integrity of the root file system (which was mounted read-only) and then remounting it for full read-write access, and sets up the [[Computer network|network]].<ref name="oldfield" />
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