Preface

• Welcome and Introduction
• Specific Course Objectives
• Your Questions
• Typestyle Conventions

Shell Basics

• Review of Shell Basics
• Why Write Shell Scripts?
• Why NOT Write Shell Scripts?
• Alternate Unix Scripting Languages
• Which Shell for You?
• Why use ksh93 or bash?
• Identifying a Shell
• Setting Your Login Shell

Command Line Scripting

• What is Command Line Scripting?
• Review of Command Line Editing
• Review of Startup Files
• FNG Regular Expressions

Writing Script Files

• Shell Script Structure
• Comments
• Explicit Execution
• Implicit Execution
• Executing a Script in the Current Shell
• Using print

Variables

• Variables
• Setting and Using Variables
• Using typeset
• Declaring Integers
• Read-only Variables
• Text Formatting
• Variable Scope
• Command Line Arguments
• Using shift
• Resetting Command Line Arguments
• Useful Built-in Variables

Conditional Execution

• Exit Codes
• The test command
• The let Command
• The if Statement
• Variations on if
• Command Grouping
• The Logical AND - &&
• The Logical OR - ||
• The case Statement

Substitution and Quoting

• Variable Substitution
• Default/Alternate Values
• Default/Alternate Values (continued)
• Substring Operators
• Substring Operators in ksh93 and bash
• Math Substitution
• Command Substitution
• Process Substitution
• Using expr
• Quoting and the Shell
• Quoting and Unset Variables
• Using eval

Input/Output

• The print Command Revisited
• The printf Command
• Redirection Recap
• Advanced Redirection
• Using here Documents
• The read Command
• The IFS Variable

Looping

• The while Loop
• The until Loop
• The for Loop
• Loop Flow Control
• Prompting with select
• Loops and Redirection
• Using getopts

Functions

• Why Use Functions
• Defining Functions
• Passing Parameters
• Return Values
• Summary of Local Function Variables
• Building a Function Library

Signals and Error Handling

• Printing Useful Error Messages
• Trapping Signals
• Using the EXIT Signal
• Debugging
• Using the DEBUG Signal
• Using the ERR Signal

Advanced Features

• Arrays
• More on Arrays
• Background Scripts
• Using nohup
• Co-processes

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