linux都有哪些运行级别？

答: 一共有七种运行级别,如下:

• 0 – System halt i.e the system can be safely powered off with no activity.
• 1 – Single user mode.
• 2 – Multiple user mode with no NFS(network file system).
• 3 – Multiple user mode under the command line interface and not under the graphical user interface.
• 4 – User-definable.
• 5 – Multiple user mode under GUI (graphical user interface) and this is the standard runlevel for most of the LINUX based systems.
• 6 – Reboot which is used to restart the system

转载于:https://www.cnblogs.com/dakewei/p/11607944.html