what are the runlevels in linux?
There are 7 run levels. from 0-6. given below is run level - its script - description about the runlevel.
run-level script description
0 /etc/rc.d/rc0.d/ shutdown/halt system
1 /etc/rc.d/rc1.d/ Single user mode
2 /etc/rc.d/rc2.d/ Multiuser with no network services exported
3 /etc/rc.d/rc3.d/ Default text/console only start. Full multiuser
4 /etc/rc.d/rc4.d/ Reserved for local use. Also X-windows (Slackware/BSD)
5 /etc/rc.d/rc5.d/ XDM X-windows GUI mode (Redhat/System V)
6 /etc/rc.d/rc6.d/ Reboot
if we give "init 0" the system jumps to run level 0 which is shutdown process. so you can shutdown ur system using init 0 command also
to shift to any runlevel just give init [runlevel] where runlevel is 0-6
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