Github user nickwallen commented on the pull request:
https://github.com/apache/incubator-metron/pull/122#issuecomment-221157587
This fix was not working for @dlyle65535 today. It would error out because
it did not understand `%C`.
I dug a little and found that this option was added in [OpenSSH
6.7](http://www.openssh.com/txt/release-6.7). I wanted to provide a warning
for other users who have older versions of OpenSSH.
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