SSH 的详细使用方法如下：
ssh [-l login_name] [hostname | user@hostname] [command] ssh [-afgknqtvxCPX246] [-c blowfish | 3des] [-e escape_char] [-i identity_file] [-l login_name] [-o option] [-p port] [-L port:host:hostport] [-R port:host:hostport] [hostname | user@hostname] [command] ssh [-l login_name] [hostname
ssh [-l login_name] [hostname | user@hostname] [command] ssh [-afgknqtvxCPX246] [-c blowfish | 3des] [-e escape_char] [-i identity_file] [-l login_name] [-o option] [-p port] [-L port:host:hostport] [-R port:host:hostport] [hostname | user@hostname] [command] ssh [-l login_name] [hostname
