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To complete a command or show values press the TAB key twice and that is showed as [TAB][TAB].
To indicate where you need to input your Wi-Fi network credentials is indicated with <>,
ex.: <wifi-ssid>. Replace the text <wifi-ssid> with your Wi-Fi network name (SSID) and <network-password> with your WiFis password.
sudo nmcli radio wifi on
sudo nmcli device wifi connect up <wifi-ssid> password "<network-password>"
To view if a network is already configured type: sudo nmcli device wifi connect[TAB][TAB] or sudo nmcli device wifi list