Runlevels in Red Hat Enterprise Linux

Table 9.1. Runlevels in Red Hat Enterprise Linux
Runlevel Description
0 Used to halt the system. This runlevel is reserved and cannot be changed.
1 Used to run in a single-user mode. This runlevel is reserved and cannot be changed.
2 Not used by default. You are free to define it yourself.
3 Used to run in a full multi-user mode with a command line user interface.
4 Not used by default. You are free to define it yourself.
5 Used to run in a full multi-user mode with a graphical user interface.
6 Used to reboot the system. This runlevel is reserved and cannot be changed.
 
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