Linux Init Run level

Released 2017/09/09

The init command is the process initialization tool under Linux, and the Init process is the parent process for all Linux processes, with a process number of 1. The init command is one of the most indispensable programs in the Linux operating system, and the Init process is run by the Linux kernel and is the first process in the system.

Example: # init 5

What is runlevel at run level? Simply put, the run level is the functional level that the operating system is currently running. This level is from 0 to 6 and has different functions. You can also view its English presentation in/etc/inittab.

#0 downtime (never set Initdefault to 0)

#1 Single-user mode

#2 Multi-user, no NFS (similar to Level 3, will stop some services)

#3 full Multi-user mode

#4 not used #5 X11 (Xwindow)

#6 reboot (never set Initdefault to 6

Linux Init Run level