If you wish to update all DNS zones, you can use perl command to accomplish this task. Let's say you want to update the Nameservers, SSH to the server and run the following command: (replace the words in caps/green color with your own)

cd /usr/local/directadmin/data/users
perl -pi -e 's/NS1.OLD.TLD/NS1.NEW.TLD/' */user.conf
perl -pi -e 's/NS2.OLD.TLD/NS2.NEW.TLD/' */user.conf
perl -pi -e 's/NS1.OLD.TLD/NS1.NEW.TLD/' */reseller.conf
perl -pi -e 's/NS2.OLD.TLD/NS2.NEW.TLD/' */reseller.conf

cd /var/named #(or whatever the path to your *.db files is, eg: /etc/bind, /etc/named)
perl -pi -e 's/NS1.OLD.TLD/NS1.NEW.TLD/' *.db
perl -pi -e 's/NS2.OLD.TLD/NS2.NEW.TLD/' *.db

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