Export your password
export WIFI_PASSWORD=<your-password>
If you don't want to see your password in bash history, just add a space before above command. This is not specific to this command, for any command in bash shell.
How to see existing wifi list
sudo nmcli dev wifi
Connect to your WiFi
sudo nmcli dev wifi connect "<your-wifi-name-or-ssid>" password "$WIFI_PASSWORD"
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