| Mode | Directory | Description |
| 0 | /etc/rc.d/rc0.d | Halt |
| 1 | /etc/rc.d/rc1.d | Single-user mode |
| 2 | /etc/rc.d/rc2.d | Not used (user-definable) |
| 3 | /etc/rc.d/rc3.d | Full multi-user mode (no GUI interface) |
| 4 | /etc/rc.d/rc4.d | Not used (user-definable) |
| 5 | /etc/rc.d/rc5.d | Full multiuser mode (with GUI interface) |
| 6 | /etc/rc.d/rc6.d | Reboot |
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source:http://linuxpoison.blogspot.com/2008/02/135781758016077.html