Description
nmcli is tool that allows NetworkManager management from command line. This tool is useful in those cases in which a graphical frontend is not available.
Connect/disconnect to an already configured connection
List already configured connections
nmcli con list
Connect to a configured connection by name or uuid
nmcli con up id <connection id>
nmcli con up uuid <uuid>
Disconnection by name or uuid
nmcli con down id <connection id>
nmcli con down uuid <uuid>
Network interfaces
List available devices and their status
nmcli dev status
Disconnect an interface
nmcli dev disconnect iface <interface>
Wifi
Get Wifi status
nmcli nm wifi
Turn wifi on or off
nmcli nm wifi <on|off>
List available access points(AP) to connect to
nmcli dev wifi list
Create a new connection to an AP
nmcli dev wifi connect <(B)SSID>
Modify an already configured connection
Open with a text editor the configuration file of the connection. The file is located in "/etc/sysconfig/network-scripts/" under the name of "ifcfg-<connection name>"
Connect automatically to that connection
Edit to or add the line "ONBOOT=yes"
Make the connection available only to one user
Edit or add the line "USERS=<username>"
Spoof MAC address
Edit or add the line "MACADDR=<spoofed MAC>". Don't change the line "HWADDR=<real MAC>" to spoof your MAC address.
Finally save the file and to apply changes to an already active connection execute
nmcli con up id <connection id>
Edit a connection password
To modify a connection password open with a text editor and edit the file "keys-<connection id>" located in "/etc/sysconfig/network-scripts/". The password is stored in plain text
Notes
nmcli maybe contain some bugs and lack some features graphical tools for NetworkManager have.
To see available options for nmcli deeper
man nmcli