Open Source technology has revolutionized the computing world. Many large-scale projects are in

　　production use worldwide， such as Apache， MySQL， and Postgres， with programmers writing applications

　　in a variety of languages including Perl， Python， and PHP. These technologies are in use on many different

　　systems， ranging from proprietary systems， to Linux systems， to traditional UNIX systems， to mainframes.

　　The Prentice Hall Open Source Software Development Series is designed to bring you the best of these

　　Open Source technologies. Not only will you learn how to use them for your projects， but you will learn

　　from them. By seeing real code from real applications， you will learn the best practices of Open Source

　　developers the world over