The second edition of this book continues its balance as an introductory UNIX textbook and a reference. It begins with a Unix quick start and then tours the UNIX applications interface, guiding the student though operating system utilities including process, file storage, and I/O management. This unique organization combined with additional coverage of UNIX software development tools and a quick-reference command in the introduction benefits the beginning student as well as the skilled UNIX user in demand of a solid reference text.