subcommands:
update-known_hosts (k) [HOST]... update known_hosts file
update-authorized_keys (a) update authorized_keys file
- import-subkey (i) FILE [KEYID] import existing ssh key as gpg subkey
gen-subkey (g) [KEYID] generate an authentication subkey
--length (-l) BITS key length in bits (2048)
ssh-proxycommand monkeysphere ssh ProxyCommand