The Third Edition of this invaluable tutorial and reference focuses on the Berkeley Software Distribution 4.3 and SunOS releases of UNIX, and includes appendices on the POSIX Standard and ULTRIX. Also added are chapters on Graphical User Interface, Networking, the EMACS text editor, and the KornShell. All three shells (Bourne, C, and Korn) are covered in full. Part I provides a step-by-step tutorial for anyone who wants to use UNIX for programming, e-mail, networking, or other applications. Numerous examples, exercises, and review questions contribute to "hands-on" learning of commands and functions. Part II covers more than 70 UNIX utility programs, with examples that are useful applications, making this the ideal reference for both novice and experienced UNIX users.