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middlehost allows ssh access from where you are but not securehost.
Use nice ssh piping to simulate scp through A => B => C
setting up the shell function if left as an exercise for the reader. ;-)
Agent forwarding should avoid password typing.
There are 4 alternatives - vote for the best!
Stop tormenting the poor animal cat!
Also you should not that you need a private key not protected by a passphrase on middlehost that grants you access to securehost..
If you can do better, submit your command here.
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