CP050 - Perl Programming

Course Description: Perl has been described as C, awk, sed, and shell programming all wrapped into one language. Learn how to take advantage of Perl's power through examples and extensive hands-on exercises. This course introduces object-oriented programming in Perl.

Audience: Programmers and system administrators.

Prerequisites: Fundamentals of UNIX. C Programming is recommended.

Course Contents

Overview of Perl

What is Perl?

Running Perl Programs

Example Programs

Perl Variables

Three Types of Variables

Variable Names and Syntax

Variable Naming

Lists

Scalar and List Contexts

The Repetition Operator

Arrays and Hashes

Arrays

Example - The @ARGV Array

Array Functions

Array Slices

Hashes

Hash Functions

Scalar and List Contexts Revisited

I/O: Input Operations and File I/O Filehandles

The open Function

The Input Operator <>

Default Input Operator

The print Function

File Operation Functions

Reading Directories

Operators

Perl operators

Operators, Functions and Precedence

File Test Operators

Assignment Operator Notations

The Range Operator

Quotation Operators

Pattern Matching Operators

Flow Control

Simple Statements

Simple Statement Modifiers

Compound Statements

The next, last and redo Statements

The for Loop

The foreach Loop

Regular Expressions

Pattern Matching Overview

The Substitution Operator

Regular Expressions

Special Characters

Quantifiers (*, +, ?, {})

Assertions (^, $, \b, \B)

Subroutines

Overview of Subroutines

Passing Arguments

Local Variables

Passing Names

Returning Values

Quoting and Interpolation

String Literals

Interpolation

Array Substitution

Backslashes and Single Quotes

Command Substitution

Here Documents

References

References

Creating References

Using References

Passing References as Arguments to Subroutines

Anonymous Composers

Hard References as Hash Keys

The Symbol Table

Complex Data Structures

Two-dimensional Arrays in Perl

Anonymous Arrays and Anonymous Hashes

Arrays of Arrays

Arrays of References

A Hash of Arrays

A Hash of Hashes

Packages and Modules

Packages

BEGIN and END Routines

require vs. use

Modules

The bless Function

Object-Oriented Programming in Perl

What is Object-Oriented?

Why Use Object-Oriented Programming?

Classes, Objects, and Methods in Perl

Inheritance, the "is-a" Relationship

Containment, the "has-a" Relationship

Overloaded Operators

Destructors

Advanced Regular Expressions

Substrings

Substrings in List Context

RE Special Variables

RE Options

Multiline Res

Substituting with an Expression

Binary Data Structures

Variable-Length (Delimited) Fields

Variable vs. Fixed

Handling Binary Data

The pack() Function

The unpack() function

The read () Function

C Data Structures

Multitasking with Perl

What are Single and Multitasking?

UNIX Multitasking Concepts

Process Creation with fork

Program Loading with exec()

File Descriptor Inheritance

How UNIX Opens Files

One-Way Data Flow - Pipes

Final Result - Page Viewing

Sockets Programming in Perl

Clients and Servers

Ports and Services

Berkeley Sockets

Data Structures of the Sockets API

Socket System Calls

Generic Client/Server Models

A Little Web Server

Appendix 1 - The Perl Distribution

Where Can You Get Perl?

How Do You Build Perl?

What Gets Created and Installed?

Differences Between Platforms

Appendix 2 - The Perl Debugger

Overview of the Perl debugger

Debugger Commands

Non-Debugger Commands

Listing Lines

Single Stepping

Setting and Clearing Breakpoints

Modifying the Debugger

The -w and -D Flags

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