hostnamect1 view the host name
hostnamect1 set-hostname my.smile.com set a new hostname
hostnamect1 status View hostname
nmcli connection add con-name default type Ethernet ifname ens33 create a new connection configuration
nmcli connection delete default delete a connection
nmcli connection add con-name test2 ipv4.method manual ifname ens33 autoconnect no type Ethernet ipv4.addresses 192.168.10.100/24 gw4 192.168.10.1 create a new connection configuration test2. specify a static ip address is not automatically connect