Most versions of Unix use different run levelsto define different operational and security states of the Unix system.The `init` command is used to change the run level. Other commands which change the run level include reboot, halt, and shutdown.
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Run Level
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Description
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0
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Halt
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1
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Single user mode
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2
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Multiuser, without NFS
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3
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Full multiuser mode
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4
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Unused
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5
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X11
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6
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Reboot
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