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Perl tutorials and courses

Modern Perl Web Frameworks

  • Mojolicious light-weight web framework with rainbows and unicorns.
  • Perl Dancer light-weight web framework to rock.
  • Catalyst The MVC web framework of Perl.
  • PSGI/Plack, the low-level superglue between Perl web application frameworks and web servers.
  • CGI, the Common Gateway Interface, for old-school web applications.

Object Oriented Perl

  • OOP, the classic way to write Object Oriented Perl code.
  • Moo, the Minimalist Object Oriented system for Perl.
  • Moose, the 'post modern' Object Oriented system for Perl.

Other Series

Projects and Collections

Code-Maven series

If you are a beginner, or would like to refresh your Perl programming knowledge, you can go over the Perl tutorial or watch the Beginner Perl Maven video course.

If you need to maintain a large piece of software written in Perl by other people in the last 5-10-15 years, that's a challenge. Especially if you did not get proper training in Perl. You are probably limited to a specific and old version of Perl. Check out, the Perl tutorial! You can probably skip the part about installing Perl, but the rest of the tutorial will be relevant for you.

Perl is often used in Test Automation. If you work in this field, or if you'd like to work in this field (it is much more fun to find bugs in other people's code than in yours :), then you can read the Perl tutorial and the series on Test Automation using Perl.

If you build new web applications - either privately or inside a company - you can start by reading the article comparing CGI, mod_perl and PSGI. From there you can go on reading the generic Perl tutorial or the articles on Mojolicious, Perl Dancer, Catalyst, PSGI/Plack, or even CGI, the Common Gateway Interface, for old-school web applications.

Recent Articles

readline() on closed filehandle in Perl

In a Perl program all kinds of things can go wrong and if you don't use warnings then you might not even know about it.

Take this examples that has a programming mistake. Perl would generate a readline() on closed filehandle warning if warnings were enabled helping you locate the problem, but it would silently and probably incorrectly(!) work without the warnings.


readline() on closed filehandle in Perl


Pro: How to replace a column in a CSV file using Perl

Given a CSV file, how can we replace the values in one of the columns?

For example given this file:

examples/test_cases.csv

170,test,best,one,0.1314
171,test,best,two,0.1695
172,test,best,two,0.1784
173,test,best,three,0.3748

how can we replace the 4th column to contain the value 'CIS' in every line?


How to replace a column in a CSV file using Perl