Thoroughly updated this expanded edition will improve productivity and save time for power users. Features the latest data on the popular Bourne, C and Korn Shells. Explains how to maximize the power of UNIX through Shell programming, create software tools to simplify routine work and step behind the facade of the Graphical User Interface (GUI) to tap the potency of UNIX and Shell. Includes more substantial introductory material, an expanded Shell tutorial and a complete reference section.