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This article mainly explains "what is the meaning of linux startup level". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the meaning of linux startup level".

0: stop

1: single-user mode, only root is used for maintenance

2: multi-user, cannot use net file system

3: completely multi-user

5: graphical

4: safe mode

6: restart

In fact, you can compare and understand by looking at the rc*.d file in / etc/rc.d/. Different directories contain different commands.

Init 0, the corresponding system will run the program specified in / etc/rc.d/rc0.d

S00killall 、 S01halt

Both are represented as terminating the process. Therefore, init 0 is used to indicate shutdown.

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