set-expire (e) [EXPIRE] set host key expiration
add-hostname (n+) NAME[:PORT] add hostname user ID to host key
revoke-hostname (n-) NAME[:PORT] revoke hostname user ID
set-expire (e) [EXPIRE] set host key expiration
add-hostname (n+) NAME[:PORT] add hostname user ID to host key
revoke-hostname (n-) NAME[:PORT] revoke hostname user ID