Numbers and Strings

Single-Quoted and Double-Quoted String Literals

String and Numeric Operators

Perl’s Built-in Warnings

Output with print

Comparison Operators

The under Value

The defined Function

List Literals

The qw Shortcut

List Assignment

Creating and Accessing Elements of an Array

Special Array Indices

The pop, push, shift and unshift Operators

The splice Operator

Interpolating Arrays into Strings

The reverse and sort Operator

Defining and Invoking a Subroutine

Return and Arguments Values

Private Variables in Subroutines

The strict use Pragma

The return Operator

Defining and Invoking a Subroutine

Return and Arguments Values

Private Variables in Subroutines

The use strict Pragma

The return Operator

Input from Standard Input and Diamond Operator

The chomp Operator

The Invocation Arguments

Output to Standard Output

Formatted Output with print

Filehandles

Opening and closing a Filehandle

Fatal Errors with die

Warning Messages with warn

Automatically die-ing

Output with say

Creating and Accessing Hash Elements

Hash Assignment

The keys and values Functions

Each Function

The exists Function

The delete Function

The %ENV hash

What Are Regular Expressions?

Matching with Regular Expressions

Processing Text with Regular Expressions

Anchors

The Binding Operator

The if Control Structure

The else Clause with unless

The elseif Clause

The unless Control Structure

The until Control Structure

The while Control Structure

The foreach Control Structure

Perl’s Favorite Default: $_

The Naked Block Control Structure

The for Control Structure

Loop Controls

The last Operator

The next Operator

The redo Operator

Labelled Blocks

Installing Modules

Using Simple Modules

The File:: Basename Module

Using Only Some Functions from a Module

Databases and DBI

Dates and Times

File Test Operators

Testing Several Attributes of the Same File

File Test Operators

Examining Several Attributes of the Same File

The stat and lstat Functions

The local time Function

Moving Around the Directory Tree

Globbing

Directory Handles

Manipulating Files and Directories

Removing, Renaming links Files

Making and Removing Directories

Modifying Permissions

Making and Removing Directories

Changing Ownership

Changing Timestamps

Finding a Substring with index

Manipulating a Substring with the substrate

Formatting Data with sprint

Using sprintf with “Money Numbers.”

Advanced Sorting

Sorting a Hash by Value

Sorting by Multiple Keys

The Smart Match Operator

Smart Match Precedence

The given Statement

Dumb Matching

The system Function

Avoiding the Shell

The Environment Variables

The exec Function

Using Backquotes to Capture Output

External Processes with

The system Function

Avoiding the Shell

The Environment Variables

The exec Function

Using Backquotes to Capture Output

External Processes with IPC::System:: Simple

Processes as Filehandles

Getting Down and Dirty with Fork

Sending and Receiving Signals

Slices

Array Slice

Hash Slice

Trapping Errors

Using Eval

More Advanced Error Handling

autodie

Picking Items from a List with grep

Transforming Items from a List with map

Fancier List Utilities