Not that having a newer, shinier book is not nice, but if $$$ count, do two things before diminution of trust is a absolute reason to buy a new one:
- Check in internet (publisher's site) for a listing of errata. Good books tend to have them. Reliable publishers tend to post them.
- Check the head section for an explanation of any formatting conventions. Granted, what you've quoted sounds pretty-non-standard and confusing, well-edited books on any programming language tend to have a set of conventions that are explained "up front" (for some somewhat variable value of "up front") and then used without further ado.
And if/when you do go looking for a new book, I recommend that you search first, foremost, and likely last at O'Reilly and Apress. Not all publishers of texts on Perl can/do provide reference or tutorials that come even close, although you may want to search this site for some recommended sources -- in print and online.
Jumping to conclusions is poor exercise!
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I would also definitely recommend O'Reilly, you'll be sure to have books written by some of the best experts.
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