On Fri, 25 Feb 2000, Mayur Joshi wrote:
} What are runlevels in Linux. What is its significance? Why the default
} runlevel is 3? Why are the apps in different runlevels?
man init:
RUNLEVELS
A runlevel 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 runlevels are
defined in the /etc/inittab file. Init can be in one of
eight runlevels: 0-6 and S or s. The runlevel is changed
by having a privileged user run telinit, which sends
appropriate signals to init, telling it which runlevel to
change to.
Runlevels 0, 1, and 6 are reserved. Runlevel 0 is used to
halt the system, runlevel 6 is used to reboot the system,
and runlevel 1 is used to get the system down into single
user mode. Runlevel S is not really meant to be used
directly, but more for the scripts that are executed when
entering runlevel 1. For more information on this, see the
manpages for shutdown(8) and inittab(5).
Runlevel 3 (under RedHat) is the text mode (shell) for linux while 5 is
graphical (X). 1 is a single user run level.
Some people like a GUI and some like a CLUE.
Philip
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