Learning Perl

This weekend I've been trying my hand at revising some of TWiki's code, which is written in Perl. Before today I'd never worked in Perl, so I spent most of my time learning the basic syntax, but thanks to a number of online references I was able to make the changes I wanted. Here are the sites that were of particular use:

• Practical Perl Programming - includes dozens of pages covering everything from variables, arrays, and functions to regular expressions and modules, including a very handy list of array functions.
  
• Picking Up Perl - another online book about Perl, again with dozens of useful pages. Their associative array page was particularly useful.
  
• Tizag.com - has a moderately-sized Perl tutorial that includes lots of sample code.
  
• CGI101.com - has a good tutorial on Perl variables, including arrays and associative arrays (hashes).
  
• Pageresource.com - has a series of tutorials on a range of Perl topics, including sections on operators and conditionals.

Of course, I didn't find perl.org until after I'd done most of my work. They have a very nice beginners area, which includes links to four online textbooks that are free to read online.