Sams Teach Yourself Perl in 21 Days, Second Edition

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Because you're on Unix, Perl was written for you. All core Perl man pages, FAQs, utilities, modules, and documentation were originally written for Unix, so you should be fine starting right off. The central repository of all things Perl is at www.perl.com; start from there and work downward. And, of course, there are always the pointers scattered throughout this book.