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[leafnode-list] [suggestion] Unreadable error message

I had some weird junk at stdout from 1.9.9, so I just installed
1.9.12.  (RedHat 6.0, installed like clockwork.)  I still got
some junk at stdout.  I thought it was binary leaking out until
I decided to pass it through `od -c`.

It turned out there was some garbage in interesting.groups/. and
the binary I was getting was the garbage filename.

Before putting a filename into an error message, pass it through
a filter to replace unprintable chars with '?', as ls does.  Most
programs never need to, but leafnode is letting an outside agency
define those names.  :-/

Oisin  "Curly++"  Curtin                     ocurtin@SPAM@usa.net
Surface Liaison, Minetown Digger                    Send no SPAM@

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