Changing the Run levels 



/sbin/telinit N
or 

/sbin/init N
where N is a new run level. 


/sbin/init 0
is the same as 

shutdown -h now 



/sbin/init 6
is the same as 

shutdown -r now

To figure out in what Run Level you are, run 

who -r
or 

/sbin/runlevel
It shows the previous and the current Run Levels.
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