Perl Beginner Guide
Introduction
1.
Basics
1.1.
Data types
1.1.1.
Scalars
1.1.2.
Arrays
1.1.3.
Hashes
1.1.4.
References
1.1.5.
Contants
1.2.
Flow control
1.3.
Modules
1.3.1.
Functions
1.3.2.
Packages
1.4.
Operators
2.
Unit Tests
2.1.
Test::More
2.2.
Test::Class
2.3.
Advanced Tests
3.
Object Orientation
3.1.
Basic concepts
3.2.
Methods
3.3.
Variables
4.
Text Processing
4.1.
Regular Expressions
4.2.
File IO
4.3.
User input
5.
Miscellaneous
5.1.
Dump variable contents
5.2.
Glossary
5.3.
Tutorials
5.4.
Date and Time
5.5.
Global variables
5.6.
Argument handling
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Perl Beginner Guide
Glossary
http://perldoc.perl.org/perlglossary.html
lvalue: a storage location to which a value can be assigned (e.g. variable, array)