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| [[http://www.debian.org/doc/manuals/reference/#s-runlevels|http://www.debian.org/doc/manuals/reference/]] - Debian Reference's runlevels section | [[http://www.debian.org/doc/manuals/reference/ch03.en.html#_stage_4_the_normal_debian_system|Debian Reference's runlevels section]] |
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| * 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]]. |
* 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]]. |
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 /usr/share/doc/sysv-rc/.
manpages : inittab,init,rcS, update-rc.d, runlevel.