Read e-book online Beginning Perl PDF

By Simon Cozens

ISBN-10: 1861003145

ISBN-13: 9781861003140

Perl is an immensely well known scripting language that mixes the simplest positive aspects of C, key UNIX utilities and a strong use of standard expressions. It has a variety of makes use of past easy textual content processing and is often used for internet programming - developing and parsing CGI types, validating HTML syntax and links - in addition to email and Usenet information filtering. Perl is more and more the process administrator's scripting language of selection and is used for dossier and listing manipulation, database entry and a complete variety of day-by-day process operator chores.

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The next number, number two, is represented as 10. Then 11. And we need some more of our circuit. Number four is 100, 5 is 101, and so ad infinitum. If we got used to it, and we used the binary system naturally, we could count up to 1023 on our fingers. This may sound like an abnormal way to count, but even stranger, counting mechanisms are all around us. As I write this, it's 7:59pm. In one minute, it'll be 8:00pm, which seems unremarkable. But that's a base 60 system. In fact, it's worse than that – time doesn't stay in base 60, because hours carry at 24 instead of 60.

0::Text User Contributed Perl Documentation Text::Wrap(3) NAME Text::Wrap - line wrapping to form simple paragraphs ... The pages are written in a special mark-up language called 'POD' (which sounds mysterious, but in fact stands for 'Plain Old Documentation'). The perldoc utility attempts to translate this into ordinary text when you view it, but if for some reason it cannot, you may need to specify the –t option to perldoc. pod =head2 How do I reverse a string? Use reverse() in scalar context, as documented in • $reversed = reverse $string; then you will need to run perldoc –t –q reverse instead.

In comparison, Perl's virtual machine doesn't much resemble any existing computer processor and is far less likely to be built. Once you've got this machine code, which we call bytecode, you can do a number of things with it. You can: ❑ Save it away to be run later. ❑ Translate it to the native machine code of your computer, and run that instead. ❑ Run it through a program that pretends to be the virtual machine and steps through the bytecode, and performs the appropriate actions. We don't really do the first of these in Perl, although Java does.

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Beginning Perl by Simon Cozens


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