Introduction to Perl and BioPerl
This note explains the following topics: Perl program structure, Variable types, Scalars , Pragmas , Operators , Arrays , Hashes , Control structures, Loop modifers, Subroutines , Reading and Writing a file, Filehandles , Regular expressions, Regex anchors and operators, Running perl, POD tools, What is Bioperl, Gotchas , Objects in Perl, Interfaces and Inheritance in Bioperl, Bioperl components, Parse a sequence from file, output, Read in sequence and write out in different format, Sequence Databases.
Author(s): Heikki Lehväslaiho
104 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 contents include:Prerequisites, Grading policies, Acquiring Perl, Perl Resources, Shameless Plugs, The Very Basics,Scalars, Lists and Arrays, Hashes, Filehandles, Subroutines, Perl Syntax, Datatypes, Control Structures, I/O, Regular Expressions, References, Modules etc.
Author(s): Bryan Jurish, Universitat Potsdam
104 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
