ssh -J (ProxyJump)指定多主机

今天读了一下ssh的man手册，期望发现可以jump多主机跳转到目标机器的方法，果然找到了，记录如下：

ssh -J "user@host1:port,user@host2:port,user@host3:port"  user@host4
#mam手册的解释：
-J [user@]host[:port]
             Connect to the target host by first making a ssh connection to the jump host and then establishing a TCP forwarding to the ultimate destination from there.  Multiple jump hops may be
             specified separated by comma characters.  This is a shortcut to specify a ProxyJump configuration directive.

多主机之间用逗号隔开，如果某个主机的sshd服务不是默认22端口，需要在IP后加“:port”（冒号和端口号）指定主机端口