I have modified the code here: http://code.google.com/p/serial-logger/source/browse/trunk/logger.pl and added: use warnings It now complains about $sub I have searched for some information but haven't come up with much. Since this is a very short program - very close to the same size as the logger code referenced I see little need to knowing where the error occured as there is only one statement like this so it seems like I could just drop that part of the error output. Also wondering what "smdr" in the error message refers to.

In reply to use of $sub by JimLS

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