#mount /dev/sr0 /mnt                          \\  把光盤掛載到“/mnt”上面 
#df                                            \\查看是否已經(jīng)掛載

 #yum clean all                            \\  清楚yum倉庫緩存 
 #yum makecache                             \\ 創(chuàng)建yum倉庫緩存
 #yum repolist                              \\ 列出可用yum倉庫
 #yum grouplist                              \\ 列出程序組

#startx           
\\ 啟動xwindow 進入圖形化桌面

[root@localhost Desktop]# systemctl get-default          \\查看默認運行級別
multi-user.target
[root@localhost Desktop]# cat /etc/inittab
# inittab is no longer used when using systemd.
#
# ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# Ctrl-Alt-Delete is handled by /etc/systemd/system/ctrl-alt-del.target
#
# systemd uses 'targets' instead of runlevels. By default, there are two main targets:
#
# multi-user.target: analogous to runlevel 3                \\運行級別3：多用戶界面
# graphical.target: analogous to runlevel 5                  \\運行級別5：圖形化界面
# # To set a default target, run: # # ln -sf /lib/systemd/system/.target 
/etc/systemd/system/default.target #
[root@localhost Desktop]# systemctl set-default graphical.target \\設置默認圖形化運行級別
rm '/etc/systemd/system/default.target'
ln -s '/usr/lib/systemd/system/graphical.target' '/etc/systemd/system/default.target'
[root@localhost Desktop]# systemctl get-default                    \\查看默認運行級別
graphical.target                                                    \\圖形化設置OK
[root@localhost Desktop]#