run_levels []

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Run Levels and their meanings:

Value	Explanation
0	Halt
1	Single-user text mode
2	Not used (user-definable)
3	Full multi-user text mode
4	Not used (user-definable)
5	Full multi-user graphical mode (with an X-based login screen)
6	Reboot

CentOS 6:
List run levels:

chkconfig --list