NetworkManager

NetworkManager is the default connectivity daemon on most desktop distributions and many servers. nmcli is its CLI; it stores connection profiles in /etc/NetworkManager/system-connections/ and brings them up automatically based on hardware presence and policy.

operator@system:~$ nmcli device status
operator@system:~$ nmcli con show
operator@system:~$ nmcli con up wifi-home
operator@system:~$ nmcli dev wifi connect <SSID> password <pwd>