It removes a line from the known_host file. When spinning up a new VM/container or reaching a machine that has an IP/hostname you've used before (happens a lot

It removes a line from the known_host file. When spinning up a new VM/container or reaching a machine that has an IP/hostname you've used before (happens a lot in dev environments/NATed networks), you'll get a warning about a possible MITM attack. ncurses is not involved though.