Basic Scripting Techniques -- Shell Script Debugging -- Standard Function Library -- Date and Time Manipulation -- Comparisons and Tests -- Accepting Command-Line Options, Switches, and Parameters -- Testing Variables and Assigning Defaults -- Indirect Reference Variables -- Shell Process Tree -- Data Redirection -- Piping Input to read -- System Interaction and Advanced Techniques -- Math from the Shell -- cron -- Self-Linked Scripts -- Throttling Parallel Processes -- Command-Line Editing and History -- Scripting from the Command Line -- Automating User Input with expect -- User Input Timeout -- Instant Keyboard Response -- Directory Copying -- A Brief Tour of the X Display Environment -- X Navigation Window -- Command-Line E-mail Attachments -- Text-Processing One-Liners -- Editing Files in Place -- Evaluating Variables in a Flat File -- Read Piped Input -- Free-Format Output Using cat -- Automating Interactive Processes -- Useful Scripts -- Automating E-mail with procmail -- Process-Management Monitor -- Managing File Counts -- Processes Running from inittab -- Automatic RCS -- Colorful /proc Reporting -- Password-Aging Notification -- A Pseudo-shadow File -- Linux Gold-System Build -- System Snapshots -- Removing Large Files and Log Rolling -- Core Finder -- Network Adapter Failover.