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## Auto-converted by kwiki2moinmoin v2005-10-07
The groups of processes or working modes of a UNIX or UNIX-compatible operating system 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.
#language en
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I.e. Debian has seven runlevels (0-6). 0 = a halted system; 1 = a single-user, stand-alone system; 2-5 = various multi- user modes; and 6 = system reboot. Each runlevel designates a different system configuration and allows access to different processes. {{{#!wiki debian
[[http://www.debian.org/doc/manuals/reference/#s-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 :
 * sysv-rc README files in [[http://sysinf0.klabs.be/usr/share/doc/sysv-rc/|/usr/share/doc/sysv-rc/]].
 * manpages : [[DebianMan:5/inittab|inittab]],[[DebianMan:8/init|init]],[[DebianMan:5/rcS|rcS]], [[DebianMan:8/update-rc.d|update-rc.d]], [[DebianMan: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 :