The answer in this sub-forum is the same as it was in the other sub-forum where you asked the exact same question:
As far as I'm aware, you'd have to process the entire blockchain using commands such as getblockhash, getblock, and getrawtransaction to search for any and all unspent transaction outputs associated with the address you are interested in. Then you'd have to add up all the unspent outputs to arrive at a total balance.
To avoid having to repeatedly scan the entire blockchain, you'd probably be better off scanning it once and building a database table with the complete UTXO set. Then you'd want to use blocknotify to update your UTXO table everytime a new block is created. That way you could just query your UTXO table to find address balances.