Edit the Hosts File – Mac Jul 28, 2020 | Uncategorized Open Terminal.Enter: sudo nano /etc/hostsClick Enter.Enter the admin password.Make edits.Save file: Ctrl + OExit: Ctrl + XTo clear DNS cache, enter in terminal: sudo killall -HUP mDNSResponderClick Enter. Overrides DNS and maps a specific domain name to an IP address that you define.