in reply to Format definition query

I suggest you read the warning message. It tells you what to do.

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Re^2: Format definition query
by pme (Monsignor) on Jan 12, 2015 at 20:33 UTC
    If you need more verbose explanation of warning messages then they can be piped through splain command like this: 
    $ perl -wc myscript.pl 2>&1 | splain

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