Just to clarify one point about 

while (<STDIN>)

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Q: Why does this not stop on a blank line?

A: <STDIN> is returning a newline character '\n', which is true. In practice, regardless of O/S, you never get the empty string or a bare 0, hence the only false value you encounter is undef.

In reply to Re: Re: question about $_ and eof by rinceWind
in thread question about $_ and eof by wageslave

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