The third edition of this book has been revised to cover all the important commands and functions for System V Release 4.2, plus appendices on Solaris 2.0, AIX, Ultrix, SCO and HPUX. It features a new chapter on Graphical User Interfaces (GUI), including OpenLook and Motif, and expanded coverage of networking and e-mail commands. There is also increased information on the language programming environment and EMACS.