Special Edition Using CGI
By Jeffry Dwight and Michael Erwin
The Common Gateway Interface, or CGI, is one of the most useful tools in a Webmaster's kit. Whether you're the lone maintainer of a single home page on someone else's machine or the Webmaster of a huge domain, you'll find that CGI is essential for anything beyond presenting static text and graphics.
CGI is the magic behind Web-based interactive games, page counters, order-entry systems, online shopping carts, SQL database interfaces, animations, and clickable images. In fact, you'll find that CGI, in one of its many forms, is what brings the World Wide Web to life.
We assume throughout the book that you have at least an intermediate understanding of programming in one or more languages. This book won't teach you how to program, but it will teach you how to use your existing programming skills to make CGI scripts work.
We didn't shy away from complicated topics, but we made sure to cover the fundamentals, too. In all, if you're comfortable with C, Perl, Visual Basic, or AppleScript, you should be able to glean a great deal of information from these pages.
We explain the basics of CGI programming fairly well, so even if you've never thought of writing CGI before, you'll do fine. If you're already an accomplished CGI programmer, you'll find hundreds of tips and tricks throughout the book to expand your repertoire.
Where possible, we used pseudocode or a textual description of the process under discussion. We did this for a couple of reasons: First, this book is intended to be platform-independent, meaning that you should be able to profit from it no matter what server you run and no matter what programming environment you use. Second, a textual description forces the reader (and the author) to focus on the process rather than the syntax. The goal is for you to understand how the magic works, not just what to type.
You'll also find a lot of actual code, both in the pages of the book and on the accompanying CD-ROM. We assume that programmers, once they understand the concepts, will want to go forth and create programs. What better way than to be armed with working samples?
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