the key is added to the user's known_hosts file. If a key is found
but is unacceptable for the host, any matching keys are removed from
the user's known_hosts file. If no gpg key is found for the host,
the key is added to the user's known_hosts file. If a key is found
but is unacceptable for the host, any matching keys are removed from
the user's known_hosts file. If no gpg key is found for the host,