Perl Programming by Nathan Clement
This note provides a brief introduction to the language for students who want to add Perl to their toolbox. It assumes familiarity with the fundamental elements of computer programming, but no prior experience with Perl or any other particular language is necessary. Topics covered includes: Data types, Variables, Sigils, Defined-ness, Truth, Control flow, Advanced iteration, Functions, Regular expressions, Using modules and objects, Tied variables, Perl CGI and Perl DBI.
Author(s): Nathan Clement
NA Pages 
Perl Programming by Wikibooks.org
This book assumes that you know absolutely nothing about programming at all and that Perl is your first language. However, basic operations such as making text files are outside of the realm of this tutorial.
Author(s): Wikibooks.org
NA Pages
This PDF covers the following topics related to Perl : Getting Started with Perl, Arrays, Hashes and Loops, File Handling, Regular Expressions, Subroutines, References and Complex Data Structures, Perl Modules, Interacting with external programs.
Author(s): Babraham BioInformatics
76 Pages
This PDF covers the following topics related to Perl : Introduction and philosophy, Basics, Variables and data types, Important concepts, Control structures, I/O, Interacting with UNIX.
Author(s): Brent Yorgey
28 Pages
The aim of this note is to give you not just an understanding of the workings of the perl interpreter, but also the means to investigate more about it, to analyze and solve bugs in the Perl core, and to take part in the Perl development process.
Author(s): Simon Cozens
NA Pages
Beginning Perl Free Book by Simon Cozens
Perl is an immensely popular scripting language that combines the best features of C, key UNIX utilities and a powerful use of regular expressions. This book promotes the use of Perl as a programming language, encouraging the creation of legible and sensible programs so as to dispel the image of Perl as a confusing and obscure language.
Author(s): Simon Cozens
NA Pages
This book invites Perl programmers and their customers to take a fresh look at software development. It explains Extreme Perl to both programmers and business people.
Author(s): Robert Nagler
194 Pages
