We concentrate on C programming, looking at the GNU tools, and the UNIX C libraries, to teach you step by step how to write, build, and debug serious application code. Throughout the book, we'll develop a fully featured CD Database application, allowing you to see the theory of each new topic applied to a real application. As well as handling basic file operations, input and output and dealing with the way UNIX handles data, we'll introduce such advanced topics as inter-process communication, networking, and using CGI scripting to build a web interface - all the elements of client-server programming. We also introduce the GTK+ and show how to build rich graphical user interfaces for X with GNOME. Finally, there's an introduction to device drivers, to give you a window into the way the Linux kernel itself works.