Run level Description
0-1 Reserved for the future use of the operating system.
2 Contains all of the terminal process and daemons that are run in themultiuser environment. This is the default run level.
3-9 Can be defined according to the user’s preferences
a,b,c,h These are not true run levels; they differ from run levels in that the initcommand cannot request the entire system to enter these run levels.
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