Perl or perl?
When you read this book and other works about Perl, you'll see an apparent inconsistency in capitalization: sometimes it's written as "Perl", and others as "perl". There's really no inconsistency; the authors are referring to two different things. Perl is the language itself; perl is the program that runs Perl programs. There is only one Perl, but there are many perls (one or more for each type of computer).
Sometimes this distinction gets a bit blurred: For instance, most people will write, "Perl objects to mismatched parentheses" when it is arguably the program that's doing the objecting and not the language. Just don't write "PERL"; Perl isn't an acronym, it doesn't stand for anything. (Well, aside from standing for diversity of expression, freedom from artificial constraints, and the right to have fun in your work. But we'll get to those later.)
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