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How do I forward a single arbitrary SSH key to a given host?

Forwarding keys is a security tradeoff, so when you do it, it's ideal to send only what you need.

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Start up a ssh-agent just for this connection, add the desired key, then SSH in the subshell.

ssh-agent bash -c 'ssh-add /home/username/.ssh/some_key_id_rsa; ssh -A some_host'
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