linux 系统图形界面与文本界面切换
[root@hadoop03 sbin]# systemctl get-default
graphical.target
[root@hadoop03 sbin]# systemctl set-default multi-user.target
[root@hadoop03 sbin]# systemctl get-default
graphical.target
[root@hadoop03 sbin]# systemctl set-default multi-user.target