Usage: kf [-FGh] [--port=port] [-p port] [--login=login] [-l login] [--ccache=ccache] [-c ccache]
   [--forwardable] [--no-forwardable] [--help] [--version] hosts
-p port, --port=port       port to connect to
-l login, --login=login    remote login name
-c ccache, --ccache=ccache remote cred cache
-F, --forwardable          Forward forwardable credentials
-G, --no-forwardable       Don't forward forwardable credentials