The clerk before entering on the duties of his office shall, in addition to the oath of office prescribed by the Constitution, take the oaths required of such officer by § 8-3-20. Said oaths must be endorsed upon the commission, subscribed by the officer and attested by a magistrate or notary public of the county for which the clerk shall have been elected or appointed. At the opening of the first term of the court which may be held thereafter the clerk shall produce his commission, with the endorsement aforesaid, and after the same has been read in open court shall make a fair entry thereof in the journals of the court.