Contents Foreword to the Second Edition xix Preface xxi Preface to the Second Edition xxv Preface to the First Edition xxix Chapter 1. UNIX System Overview 1 1.1 Introduction 1 1.2 UNIX Architecture 1 1.3 Logging In 2 1.4 Files and Directories 4 1.5 Input and Output 8 1.6 Programs and Proc