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⇤ ← Revision 12 as of 2009-01-04 15:44:15 →
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Comment: update Debian "official material" banner
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||<tablestyle="width:100%;" style="width:32px;border-color:#ff9ec2" >inline:Portal/IDB/official-doc.png||<style="border-color:#ff9ec2;background-color:#ffe4f1" >[http://www.debian.org/doc/manuals/reference/#s-runlevels http://www.debian.org/doc/manuals/reference/] - Debian Reference's runlevels section|| {{{#!wiki debian
[[http://www.debian.org/doc/manuals/reference/#s-runlevels|http://www.debian.org/doc/manuals/reference/]] - Debian Reference's runlevels section
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The groups of processes or working modes of a Linux which are started by ["init"] are controlled by the runlevel. The runlevel is a digit from 0 to 6 or the letter S. Runlevels 0, 6 and S are reserved for shutdown, reboot and single user mode. Runlevel 1 is also single user mode. The groups of processes or working modes of a Linux which are started by [[init]] are controlled by the runlevel. The runlevel is a digit from 0 to 6 or the letter S. Runlevels 0, 6 and S are reserved for shutdown, reboot and single user mode. Runlevel 1 is also single user mode.
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 * sysv-rc README files in [http://sysinf0.klabs.be/usr/share/doc/sysv-rc/ /usr/share/doc/sysv-rc/].
 * manpages : [http://manpages.debian.net/man/5/inittab inittab],[http://manpages.debian.net/man/8/init init],[http://manpages.debian.net/man/5/rcS rcS], [http://manpages.debian.net/cgi-bin/man.cgi?query=update-rc.d&format=html&locale=en update-rc.d], [http://manpages.debian.net/man/8/runlevel runlevel].
 * ''Debian Reference's'' [http://www.debian.org/doc/manuals/reference/ch-system.en.html#s-custombootscripts RunLevels Customizing].
 * ''Debian Reference's'' [http://www.debian.org/doc/manuals/reference/ch-system.en.html#s-runlevels Runlevels].		  * sysv-rc README files in [[http://sysinf0.klabs.be/usr/share/doc/sysv-rc/|/usr/share/doc/sysv-rc/]].
 * manpages : [[http://manpages.debian.net/man/5/inittab|inittab]],[[http://manpages.debian.net/man/8/init|init]],[[http://manpages.debian.net/man/5/rcS|rcS]], [[http://manpages.debian.net/cgi-bin/man.cgi?query=update-rc.d&format=html&locale=en|update-rc.d]], [[http://manpages.debian.net/man/8/runlevel|runlevel]].
 * ''Debian Reference's'' [[http://www.debian.org/doc/manuals/reference/ch-system.en.html#s-custombootscripts|RunLevels Customizing]].
 * ''Debian Reference's'' [[http://www.debian.org/doc/manuals/reference/ch-system.en.html#s-runlevels|Runlevels]].

http://www.debian.org/doc/manuals/reference/ - Debian Reference's runlevels section

The groups of processes or working modes of a Linux which are started by ?init are controlled by the runlevel. The runlevel is a digit from 0 to 6 or the letter S. Runlevels 0, 6 and S are reserved for shutdown, reboot and single user mode. Runlevel 1 is also single user mode.

I.e. Debian has seven runlevels (0-6). 

 0 (halt the system) 
 1 (single-user mode), 
 2 through 5 (multiuser modes), and 
 6 (reboot the system).

Each runlevel designates a different system configuration (/etc/rc[0-6S].d/) and allows access to different processes.

Your system starts with the runlevel specified in /etc/inittab (which can be overridden at boot time, with kernel parameter).

See :