Book Image

Linux Essentials - Second Edition

By : Christine Bresnahan, Richard Blum
Book Image

Linux Essentials - Second Edition

By: Christine Bresnahan, Richard Blum

Overview of this book

Linux Essentials, Second Edition provides a solid foundation of knowledge for anyone considering a career in information technology, for anyone new to the Linux operating system, and for anyone who is preparing to sit for the Linux Essentials Exam. Through this engaging resource, you can access key information in a learning-by-doing style. Hands-on tutorials and end-of-chapter exercises and review questions lead you in both learning and applying new information—information that will help you achieve your goals! With the experience provided in this compelling reference, you can sit down for the Linux Essentials Exam with confidence. An open-source operating system, Linux is a UNIX-based platform that is freely updated by developers. The nature of its development means that Linux is a low-cost and secure alternative to other operating systems, and is used in many different IT environments. Passing the Linux Essentials Exam prepares you to apply your knowledge regarding this operating system within the workforce.
Table of Contents (19 chapters)

Managing Displays


Linux provides two display modes: text-mode and GUI. A text-mode display is fairly straightforward and requires little or no management. GUI displays, on the other hand, are more complex. In Linux, the X Window System (or X for short) manages the GUI display. In the next few pages, we describe what X is and how X interacts with common display hardware.

Understanding the Role of X

Most people don’t give much thought to the software behind their computers’ displays—it all just works. Of course, behind the scenes, the task of managing the display is fairly complex. Just some of the things that the software must do on any platform include the following:

  1. Initializing the video card, including setting its resolution
  2. Allocating sections of the display to hold windows that belong to particular applications
  3. Managing windows that overlap so that only the “topmost” window’s contents are displayed
  4. Managing a pointer that the user controls...