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命令行的运行级别：3

图形界面的运行级别：5

查看当前运行的级别

[root@localhost ~]# runlevel  

图像界面到命令行到：

[root@localhost ~]# systemctl isolate multi-user.target PolicyKit daemon disconnected from the bus. We are no longer a registered authentication agent.

开机自启命令行

sudo systemctl set-default multi-user.target     

 

命令行到图像界面：

[root@localhost ~]# systemctl isolate graphical.target PolicyKit daemon disconnected from the bus. We are no longer a registered authentication agent. PolicyKit daemon reconnected to bus. Attempting to re-register as an authentication agent. We are now a registered authentication agent.

开机自启图形界面

sudo systemctl set-default graphical.target  

 

快捷键 ctrl+alt+F2 图形界面和命令行界面来回切换

    —在图像界面右键还可以调出命令行

 

 

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