ssh-keyscan version (return code: 0)
getaddrinfo version: Name or service not known
getaddrinfo version: Name or service not known
getaddrinfo version: Name or service not known
ssh-keyscan -H (return code: 1)
usage: ssh-keyscan [-46cHv] [-f file] [-p port] [-T timeout] [-t type]
[host | addrlist namelist] ...