What is the meaning of linux startup level
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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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