What works for me Get IP assigned to wlan0 on LinuxMint

NetWhere.bash.sh

Wlan_ip () {
   # Get ip assigned to wlan0 interface if it is up.
    nmcli --pretty con status uuid 'ac868f68-fd04-41c2-ac0e-2ff40fd71b7c' |
      cut -d ':' -f2 |
      awk '/ip_address/{print $3}' |tee /tmp/w0ip
}

NetWhere () {

    case "$(nmcli --terse --fields device,state dev status|grep --color=never wlan0)" in
       ( wlan0:connected )  Wlan_ip
            ;;
       ( wlan0:* ) :
            ;;
       ( *       ) :
            ;;
esac
}