Thursday, June 28, 2012

RunLevel in Linux

There are differences in the runlevels according to the operating system. seven runlevels are supported in the standard Linux kernel
The Runlevels in System  describe certains states :: For Example

a) Runlevel 0 : Halt(No activity, the system can be safely powered down)
b) Runlevel 1 : Single user mode(raerly used )
c) RL 2 : Multiple users , no NFS(network filesystem),also used rarely.
d) RL 3 : Multiple users, command line (i.e all text mode ) interface the standard runlevel for most linux based server hardware.
e) RL 4 : User define
f) RL 5 : Multiple users, GUI ; the standared runlevel for most linux based desktop system.
g) Renlevel 6 : Reboot


Linux change Run level command :

who -r // It give the current runlevel

init 1  //It is used for to change the runlevels.


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