Quoting Niall O Broin (niall at linux.ie):
> I know that one way is to have a key with a null keyphrase, and
> another way is to have sshagent running. The null passphrase is a
> problem if the destination box is ever cracked....
Well, not if the SSH key is locked down to perform only one specific,
well-chosen function on the remote end. I've been known to use this to
auto-mirror directories between machines using rsync, for example.
http://linuxmafia.com/~rick/linux-info/ssh-publickey-process
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