Perl 5 Internals
by Simon Cozens
Publisher: NetThink 2001
This is a three-hour course which provides a hands-on introduction to how the perl interpreter works internally, how to go about testing and fixing bugs in the interpreter, and what the internals are likely to look like in the future of Perl, Perl 6.
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by Nick Parlante - Stanford University
An introduction to the main features of the Perl language. It's intended for people who know some programming but need an introduction to Perl. Topics: scalar variables, strings, arrays, hash tables, file input and output, regular expressions, etc.
by A. D. Marshall - Cardiff School of Computer Science
Introduction to Perl: variables, arrays, operators, statements, functions, references, input and output, regular expressions, reports, special variables, handling errors and signals, objects, modules, debugging, command-line options, etc.
Perl 6 is the sixth edition of the Perl programming language, representing a major backwards-incompatible rewrite of the language. This online book is going to introduce the reader to the Perl 6 language and its many features.
by Chan Bernard Ki Hong
This is a free Perl tutorial that is packed with everything you need to know to get started on Perl programming. Throughout the text there are many examples examples, illustrations and exercises in the form of concept consolidation questions.