| |
| |
| |
| Introduction | |
| |
| |
| What Is a Program? | |
| |
| |
| Why Perl? | |
| |
| |
| What about CGI? | |
| |
| |
| Security Issues | |
| |
| |
| Perl and HTML | |
| |
| |
| About This Book | |
| |
| |
| What This Book Is Not | |
| |
| |
| What's New | |
| |
| |
| The Perl and CGI VQS Guide Web Site | |
| |
| |
| |
| Perl Building Blocks | |
| |
| |
| Perl Data | |
| |
| |
| Operators and Functions | |
| |
| |
| Quotation Marks | |
| |
| |
| Quoting without Quotes | |
| |
| |
| Statement, Blocks, and Scope | |
| |
| |
| Declaring Private Variables | |
| |
| |
| The Shebang Line | |
| |
| |
| Creating a Perl CGI Script | |
| |
| |
| Creating Output for a Browser | |
| |
| |
| Documenting Your Script | |
| |
| |
| Checking the Script's Syntax | |
| |
| |
| |
| About Servers, Perl, and CGI.pm | |
| |
| |
| What Is a Server? | |
| |
| |
| The Importance of Directories | |
| |
| |
| Ask Your Web Host! | |
| |
| |
| Getting a Perl Interpreter | |
| |
| |
| Getting CGI.pm | |
| |
| |
| |
| Running Perl CGI on a Unix Server | |
| |
| |
| Which Perl Are They Running? | |
| |
| |
| What About CGI.pm? | |
| |
| |
| Installing Scripts on Unix Servers | |
| |
| |
| Uploading Your Script | |
| |
| |
| Changing Permissions | |
| |
| |
| Testing Your Unix Server | |
| |
| |
| |
| Testing Scripts Locally on Windows | |
| |
| |
| Installing the Xitami or Sambar Server | |
| |
| |
| Installing Personal Web Server | |
| |
| |
| Installing IIS on Windows 2000 | |
| |
| |
| Displaying File Extensions | |
| |
| |
| Testing Your Server (Part 1) | |
| |
| |
| Installing the Perl Interpreter | |
| |
| |
| Installing CGI.pm | |
| |
| |
| Installing Scripts on Windows Servers | |
| |
| |
| Testing Your Server (Part II) | |
| |
| |
| |
| Testing Scripts Locally on the Mac | |
| |
| |
| Installing Personal Web Sharing | |
| |
| |
| The Root Web Directory | |
| |
| |
| Carefully Sharing the Root Web Directory | |
| |
| |
| Starting the Web Sharing Server | |
| |
| |
| Testing the Server (Part 1) | |
| |
| |
| Installing MacPerl | |
| |
| |
| Installing CGI.pm | |
| |
| |
| Installing Scripts on Mac Servers | |
| |
| |
| Testing Your Server (Part II) | |
| |
| |
| |
| Getting Data from Visitors | |
| |
| |
| Labeling Incoming Data | |
| |
| |
| Creating a Form | |
| |
| |
| Creating Text Boxes | |
| |
| |
| Creating Password Boxes | |
| |
| |
| Creating Larger Text Areas | |
| |
| |
| Creating Radio Buttons | |
| |
| |
| Creating Checkboxes | |
| |
| |
| Creating Menus | |
| |
| |
| Creating the Submit Button | |
| |
| |
| Resetting the Form | |
| |
| |
| Using an Image to Submit Data | |
| |
| |
| Creating a Link to a Script | |
| |
| |
| Using a Link to Input Data to a Script | |
| |
| |
| |
| Environment Variables | |
| |
| |
| Your Visitor's Browser and Platform | |
| |
| |
| Viewing Available Environment Variables | |
| |
| |
| Storing Data from Environment Variables | |
| |
| |
| |
| Getting Data into the Script | |
| |
| |
| Getting Single-Valued Form Data | |
| |
| |
| Getting Multiple-Valued Form Data | |
| |
| |
| Getting All the Form Element's Names | |
| |
| |
| Getting All the Names and Values | |
| |
| |
| |
| Simple Operations with Scalars | |
| |
| |
| Assigning a Value to a Scalar Variable | |
| |
| |
| Multiplying, Dividing, Adding, Subtracting | |
| |
| |
| Using More Than One Operator | |
| |
| |
| Raising a Number to an Exponential Power | |
| |
| |
| Using Mathematical Functions | |
| |
| |
| Getting the Remainder of a Division | |
| |
| |
| Connecting Strings Together | |
| |
| |
| Repeating a String | |
| |
| |
| Operating and Assigning in One Step | |
| |
| |
| Incrementing (or Decrementing) a Variable | |
| |
| |
| |
| Conditionals and Loops | |
| |
| |
| Comparing Numbers | |
| |
| |
| Comparing Strings | |
| |
| |
| Evaluating Conditions without Comparisons | |
| |
| |
| Testing Two or More Comparisons at a Time | |
| |
| |
| Creating a Basic Conditional Statement | |
| |
| |
| Adding Options for False Conditions | |
| |
| |
| Adding Multiple, Independent Conditions | |
| |
| |
| Using Unless | |
| |
| |
| Repeating a Block for Each Item in an Array | |
| |
| |
| Loading the Default Variable | |
| |
| |
| Repeating a Block While a Condition Is True | |
| |
| |
| Repeating a Block While a Condition Is False | |
| |
| |
| Executing the Block at Least Once | |
| |
| |
| Repeating a Block a Given Number of Times | |
| |
| |
| Nesting Conditional Statements | |
| |
| |
| Skipping a Loop Iteration | |
| |
| |
| Jumping out of a Loop Altogether | |
| |
| |
| |
| Working with Arrays | |
| |
| |
| Assigning a List to an Array Variable | |
| |
| |
| Referring to a Particular Item in an Array | |
| |
| |
| Referring to Multiple Items from an Array | |
| |
| |
| Adding or Replacing an Item in an Array | |
| |
| |
| Adding to the End or Beginning of an Array | |
| |
| |
| Removing the Last Item from an Array | |
| |
| |
| Removing the First Item from an Array | |
| |
| |
| Replacing More Than One Item in an Array | |
| |
| |
| Finding the Length of an Array | |
| |
| |
| Modifying All the Members of an Array | |
| |
| |
| Sorting Arrays | |
| |
| |
| Reversing the Order of an Array's Contents | |
| |
| |
| |
| Subroutines | |
| |
| |
| Creating a Simple Subroutine | |
| |
| |
| Using a Simple Subroutine | |
| |
| |
| Creating a Subroutine That Takes Input | |
| |
| |
| Calling a Subroutine That Takes Input | |
| |
| |
| Using a Subroutine's Return Value | |
| |
| |
| Setting the Return Value Manually | |
| |
| |
| Storing Subroutines in an External File | |
| |
| |
| Calling Subroutines from an External File | |
| |
| |
| |
| Working with Hashes | |
| |
| |
| Assigning a List to a Hash | |
| |
| |
| Getting a Value by Using a Key | |
| |
| |
| Adding or Replacing a Key-Value Pair | |
| |
| |
| Getting Several Values Using Keys | |
| |
| |
| Getting All of a Hash's Keys | |
| |
| |
| Getting All of a Hash's Values | |
| |
| |
| Getting Each Key and Value in a Hash | |
| |
| |
| Getting the Pairs in a Specified Order | |
| |
| |
| Removing Key-Value Pairs | |
| |
| |
| Checking to See If a Key Exists | |
| |
| |
| |
| Analyzing Data | |
| |
| |
| Finding Something | |
| |
| |
| Finding and Replacing | |
| |
| |
| Seeing and Using What Was Found | |
| |
| |
| Splitting a Value into Pieces | |
| |
| |
| Constructing Search Patterns | |
| |
| |
| Tips for Constructing Search Patterns | |
| |
| |
| Matching a Single Character | |
| |
| |
| Matching a String of Characters | |
| |
| |
| Matching a Character from a Group | |
| |
| |
| Matching a Character That's Not in the Group | |
| |
| |
| Using Class Shorthands | |
| |
| |
| Limiting the Location | |
| |
| |
| Choosing How Many to Match | |
| |
| |
| Curbing a Quantifier's Greediness | |
| |
| |
| Matching One Element or Another | |
| |
| |
| More on Using What You Already Matched | |
| |
| |
| |
| Remembering What Visitors Tell You | |
| |
| |
| About Hidden Fields | |
| |
| |
| Adding Hidden Fields to a Form | |
| |
| |
| Storing Collected Data in a Hidden Field | |
| |
| |
| About Cookies | |
| |
| |
| Looking at Your Browser's Cookies | |
| |
| |
| Sending a Cookie | |
| |
| |
| Setting a Cookie's Expiration Date | |
| |
| |
| Limiting a Cookie to a Domain | |
| |
| |
| Limiting a Cookie to a Part of Your Server | |
| |
| |
| Limiting Cookies to Secure Connections | |
| |
| |
| Reading and Using a Cookie | |
| |
| |
| How (and Why) Visitors Refuse Cookies | |
| |
| |
| |
| Formatting, Printing, and HTML | |
| |
| |
| Formatting Output with Perl | |
| |
| |
| Creating a Format Pattern for Integers | |
| |
| |
| Creating a Format Pattern for Non-Integers | |
| |
| |
| Creating a Pattern for Strings | |
| |
| |
| Changing the Case | |
| |
| |
| Changing Characters | |
| |
| |
| Finding the Length of a String | |
| |
| |
| Finding Where Something Is in a String | |
| |
| |
| Extracting One String from Another | |
| |
| |
| Cleaning up the End of a String | |
| |
| |
| Formatting Output with HTML | |
| |
| |
| Printing Several Lines at a Time | |
| |
| |
| Simplifying Paths to Images and Links | |
| |
| |
| Outputting Data in a Table | |
| |
| |
| |
| Security | |
| |
| |
| Reading the Security FAQs | |
| |
| |
| The Problem with Visitor Input | |
| |
| |
| Protecting Calls to the System | |
| |
| |
| Limiting Access to Files | |
| |
| |
| Using CGI.pm to Limit Incoming Data | |
| |
| |
| Keeping Information to Yourself | |
| |
| |
| Avoiding Tainted Data | |
| |
| |
| Cleaning and Using Outside Data | |
| |
| |
| |
| Files and Directories | |
| |
| |
| Opening a File | |
| |
| |
| Verifying File and Directory Operations | |
| |
| |
| Writing to an External File | |
| |
| |
| Getting Exclusive Access to a File | |
| |
| |
| Reading Data from an External File | |
| |
| |
| Closing a File | |
| |
| |
| Renaming a File | |
| |
| |
| Removing a File | |
| |
| |
| Checking a File's Status | |
| |
| |
| Opening a Directory | |
| |
| |
| Reading the Contents of a Directory | |
| |
| |
| Closing a Directory | |
| |
| |
| Changing the Working Directory | |
| |
| |
| Creating a Directory | |
| |
| |
| Changing Permissions from within a Script | |
| |
| |
| Removing a Directory | |
| |
| |
| Getting Ready to E-mail Output | |
| |
| |
| Sending Output via E-mail | |
| |
| |
| |
| Uploading Files | |
| |
| |
| Creating a Form for Uploading Files | |
| |
| |
| Getting the Name of the Uploaded File | |
| |
| |
| Finding out a File's MIME Type | |
| |
| |
| Specifying Where the File Should Be Saved | |
| |
| |
| Reading in and Limiting Uploaded Files | |
| |
| |
| |
| Debugging | |
| |
| |
| Checking the Easy Stuff | |
| |
| |
| Creating an Error Subroutine | |
| |
| |
| Using Perl's Error Reporting | |
| |
| |
| Viewing the System Error Log | |
| |
| |
| Isolating the Problem | |
| |
| |
| Following a Variable's Progress | |
| |
| |
| |
| Using Other Folks' Scripts | |
| |
| |
| Using Other Folks' Scripts | |
| |
| |
| Getting Other People's Scripts | |
| |
| |
| Expanding Compressed Scripts | |
| |
| |
| Configuring Borrowed Scripts | |
| |
| |
| Customizing Borrowed Scripts | |
| |
| |
| |
| Permissions on Unix | |
| |
| |
| Figuring out the Permissions Code | |
| |
| |
| Default Permissions | |
| |
| |
| Who's the Owner? | |
| |
| |
| |
| Unix Essentials | |
| |
| |
| Telnetting to Your Unix Server | |
| |
| |
| Executing Commands in Unix | |
| |
| |
| Dealing with Paths in Unix | |
| |
| |
| Changing the Working Directory | |
| |
| |
| Finding out Where You Are | |
| |
| |
| Listing Directory Contents | |
| |
| |
| Eliminating Files | |
| |
| |
| Creating and Eliminating Directories | |
| |
| |
| Decompressing Tar and Zipped Files | |
| |
| |
| Getting Help with Unix | |
| |
| |
| |
| Perl and CGI Resources | |
| |
| |
| Text Editors | |
| |
| |
| Telnet Programs | |
| |
| |
| Other Folks' Scripts | |
| |
| |
| Learning More | |
| |
| |
| Index | |