SSH hacks – a little sanity for remote workers
> <i>What are your favorite SSH tips & tricks?</i><p><pre><code>    $ ssh -J user1@host1 user_final@host_final
</code></pre>
or<p><pre><code>    $ ssh -J user1@host1,user2@host2 user_final@host_final
</code></pre>
Not many people know it, you don't need to launch a SSH within a SSH session - SSH has built-in support of using one SSH server as a proxy to another SSH server. Useful for <del>hacking servers</del> accessing servers behind a firewall, or using your own server as a proxy to bypass a bottleneck in the network.