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Comment: merge "Runlevel" here.
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link to docs and READMEs
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* manpages : {{{inittab}}},{{{init}}},{{{rcS}}}, {{{update-rc.d}}}. | * 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]. |
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[http://www.debian.org/doc/manuals/reference/ch-system.en.html#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 : [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].