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Nested SSH tunnels

So you need to get with SSH to host C via A and B. One intermediate host is frequently taken care of by giving a separate proxycommand, but this approach leads to a horrible mess of nested quotation if you need more jumps along the route.

A good solution is to use -J, which is massively awesome.

 $ ssh -J user@A:22,user@B:22 user@C

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