Linux model

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 runlevel：check current model
0 Halt the system
1 Single user mode
2 Basic multi user mode
3 Multi user mode
5 Multi user mode with GUI
6 Reboot the system
S, s Single user mode
init +number：change current model
Change startup model
Example:
Change runlevel to 5
[root@Orarac etc]# vi /etc/inittab
......
id:5:initdefault:
......


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