how to ssh in two machine one after another (in sequence) using shell script
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I have a somewhat neater solution for this problem now. I couldn't get it to work properly previously, but had a need to use it myself, so spent some time sorting it out.
Step one: Set up keys on the intermediate machine (call this "server") so that user@server can ssh to the node without needing a password (ie, from account user on server, ssh user@node is passwordless).
Step two: ssh to server forcing pseudo-terminal creation, and passing the final ssh command to ssh
$ ssh -t user@server ssh user@node
I'd been trying the -t on the second invocation on ssh (ie ssh user@server ssh -t user@node) which doesn't work properly.