http://www.devshed.com Perl - RSS Feeds en-us Thu, 26 Nov 2009 08:13:51 -0500 Thu, 26 Nov 2009 08:13:51 -0500 Mon, 14 Sep 2009 09:00:01 -0400 http://www.devshed.com/c/a/Perl/More-Perl-Bits/?kc=rss - In this article, we'll finish learning about bits. We'll take a look at a few more operators and an important Perl function for working with bits. Finally, we'll implement the algorithm we looked at. You may want to read the previous article if you haven't (or review it if you have) before you d...]]> http://www.devshed.com/c/a/Perl/More-Perl-Bits/?kc=rss Tue, 04 Aug 2009 09:00:46 -0400 http://www.devshed.com/c/a/Perl/Perl-Bit-by-Bit/?kc=rss - For many programmers, bits aren't an issue that receives any serious attention. Whenever someone mentions a bit, they get a vague idea of ones and zeros strung together, deep within the heart of a computer, at a level they don't have to work with or even think about. Creating a functioning program, ...]]> http://www.devshed.com/c/a/Perl/Perl-Bit-by-Bit/?kc=rss Wed, 20 May 2009 09:00:46 -0400 http://www.devshed.com/c/a/Perl/Basic-Charting-with-Perl/?kc=rss - One way of presenting data is in a chart. There are a variety of chart types, each of which has its particular strength. Perl, not surprisingly, offers a wealth of modules for creating charts to present data. In this article, we'll examine a collection of modules, appropriately named Chart, that all...]]> http://www.devshed.com/c/a/Perl/Basic-Charting-with-Perl/?kc=rss Tue, 19 May 2009 09:00:46 -0400 http://www.devshed.com/c/a/Perl/Using-GetoptLong-More-Command-Line-Options-in-Perl/?kc=rss - The Getopt::Std module allows you to read and respond to short options, that can either take values or function as boolean values. The module even aids in the creation of help and version information, taking much of the work out of things. However, sometimes you'll need to support a large number of...]]> http://www.devshed.com/c/a/Perl/Using-GetoptLong-More-Command-Line-Options-in-Perl/?kc=rss Mon, 18 May 2009 09:00:46 -0400 http://www.devshed.com/c/a/Perl/Command-Line-Options-in-Perl-Using-GetoptStd/?kc=rss - Command line arguments play a significant role in the creation of command line programs in any language. These arguments can tell the program a number of things, such as what to operate on, or how to operate on something. Perl, like most other languages, makes it very easy to read these arguments. ...]]> http://www.devshed.com/c/a/Perl/Command-Line-Options-in-Perl-Using-GetoptStd/?kc=rss Thu, 14 May 2009 09:00:45 -0400 http://www.devshed.com/c/a/Perl/Web-Access-with-LWP/?kc=rss - The Web is a wonderful resource. It contains a wealth of information about nearly every conceivable topic, and in order to access much of that information, you only need a Web browser, of which there are several to choose from. For example, if I need to check the weather before I head outside to fig...]]> http://www.devshed.com/c/a/Perl/Web-Access-with-LWP/?kc=rss Thu, 04 Sep 2008 09:00:46 -0400 http://www.devshed.com/c/a/Perl/More-Templating-Tools-for-Perl/?kc=rss - Completing the Portal But first, let's complete our portal by writing the RSSBox library that all these sources use. First, we want a ONCE block to load up the modules we need: lt;%ONCE gt; use XML::RSS; use LWP::Simple; lt;/%ONCE gt; Next we take our arguments, setting appr...]]> http://www.devshed.com/c/a/Perl/More-Templating-Tools-for-Perl/?kc=rss Thu, 28 Aug 2008 09:00:46 -0400 http://www.devshed.com/c/a/Perl/Site-Layout-with-Perl-Templating-Tools/?kc=rss - Perl Blocks There's a final way of adding Perl logic to your components, but it's not used much in the form we're about to describe. If you've got long Perl sections, you won't want to put a % at the beginning of every line. Instead, you can wrap the whole thing up in a lt;%PERL gt;... lt;/%PERL...]]> http://www.devshed.com/c/a/Perl/Site-Layout-with-Perl-Templating-Tools/?kc=rss Thu, 21 Aug 2008 09:00:46 -0400 http://www.devshed.com/c/a/Perl/Build-a-Perl-RSS-Aggregator-with-Templating-Tools/?kc=rss - Loops If we're going to get anywhere with our RSS example, we'll need to loop over a series of items--the stories in our newsreel. Thankfully, HTML::Template provides the lt;TMPL_LOOP gt; pseudotag for treating a variable as an array. For instance, the following code: lt;ul gt; lt;TMPL...]]> http://www.devshed.com/c/a/Perl/Build-a-Perl-RSS-Aggregator-with-Templating-Tools/?kc=rss Thu, 14 Aug 2008 09:00:46 -0400 http://www.devshed.com/c/a/Perl/looping-Security-and-Templating-Tools/?kc=rss - Loops, Arrays, and Hashes So much for simple templates. Because Text::Template evaluates the code in braces as honest-to-goodness Perl code, we can do a whole lot more with templates. Let's suppose we're invoicing for some design work: $client = quot;Acme Motorhomes and Eugenics Ltd. quot;; ...]]> http://www.devshed.com/c/a/Perl/looping-Security-and-Templating-Tools/?kc=rss Tue, 12 Aug 2008 09:00:46 -0400 http://www.devshed.com/c/a/Perl/Perl-Bon-Voyage-Lists-and-Hashes/?kc=rss - In our previous article we created a “database” of a bookshelf with some books on it. We then learned how to add rows to it, add a single column, and automate a process to add columns to every row. Here, we will continue working with the @Bookshelf “database.” Just so you don't have to go seeking ou...]]> http://www.devshed.com/c/a/Perl/Perl-Bon-Voyage-Lists-and-Hashes/?kc=rss Thu, 07 Aug 2008 09:00:48 -0400 http://www.devshed.com/c/a/Perl/Templating-Tools/?kc=rss - A recent thread on comp.lang.perl.moderated enumerated the Perl rites of passage-- the perfectly good wheels that every journeyman Perl programmer reinvents. These were found to be a templating system, a database abstraction layer, an HTML parser, a processor for command-line arguments, and a time/d...]]> http://www.devshed.com/c/a/Perl/Templating-Tools/?kc=rss Tue, 05 Aug 2008 09:00:47 -0400 http://www.devshed.com/c/a/Perl/Perl-Number-Crunching/?kc=rss - The year was...well I don't know exactly what year it was. But there stood Pythagoras of Samos, the great Greek magician and founder of the religion, Pythagoreanism, which is almost as wacky as Scientology, except L. Ron Hubbard didn't name it Hubbardism. You probably know this Greek bad-ass as the ...]]> http://www.devshed.com/c/a/Perl/Perl-Number-Crunching/?kc=rss Thu, 31 Jul 2008 09:00:47 -0400 http://www.devshed.com/c/a/Perl/Perl-Debuggers-in-Detail/?kc=rss - Wrapping Subroutines I dont have to copy a module file to change its behavior. I can override parts of it directly in my code. Damian Conway wrote a wonderful module called Hook::LexWrap to wrap a subroutine around another subroutine. That means that my wrapper subroutine can see the arguments com...]]> http://www.devshed.com/c/a/Perl/Perl-Debuggers-in-Detail/?kc=rss Thu, 24 Jul 2008 09:00:48 -0400 http://www.devshed.com/c/a/Perl/Debugging-Perl/?kc=rss - The standard Perl distribution comes with a debugger, although its really just another Perl program, perl5db.pl. Since it is just a program, I can use it as the basis for writing my own debuggers to suit my needs, or I can use the interface perl5db.pl provides to configure its actions. Thats just th...]]> http://www.devshed.com/c/a/Perl/Debugging-Perl/?kc=rss