ssh login and execute command

ssh -t wang@172.31.33.211 "ssh -t -g -R 33334:172.31.32.100:22322 xxxx@172.31.33.3 "ssh -p 33334 qch.wang@localhost" "

通过命令
   ssh -t wang@172.31.33.211
   登录到172.31.33.211
   并且，登录后立即执行命令
        ssh -t -g -R 33334:172.31.32.100:22322 xxxx@172.31.33.3
        登录到172.31.33.3，把其所有访问其33334端口的请求，转发到172.31.32.100:22322
        并且，登录后立即执行命令
            ssh -p 33334 qingchuan.wang@localhost
            登录到本机的33334端口

整条命令执行完，会登录到qingchuan.wang@172.31.32.100:22322

为了避免输入密码的麻烦，可以把:
本机的id_rsa.pub                         添加到    wang@172.31.33.211:~/.ssh/authorized_keys
wang@172.31.33.211:~/.ssh/id_rsa.pub    添加到    xxxx@172.31.33.3:~/.ssh/authorized_keys
xxxx@172.31.33.3:~/.ssh/id_rsa.pub    添加到    xxxx@172.31.33.3:~/.ssh/authorized_keys