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From: Mark Felder <feld@FreeBSD.org>
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Subject: Re: ssh-copy-id
Date: Fri, 28 Feb 2014 14:20:27 -0600
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I modified it like this:

                        echo "alg $alg"              
                        echo "key $key"
                        echo "comment $comment"
                        printf "$alg $key $comment\n" >> "$keyfile" ; \


so I could see where printf was breaking. It's breaking on the first one
-- $alg

Unmatched '.
key: Undefined variable.
comment: Undefined variable.