Bash Programming

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1. Course Introduction

Course Objectives Course Overview

Using the Workbook

Suggested References and Reading

2. UNIX Processes

What is a Process? Process Structure The ps Utility

Options to the ps Utility

Background Commands (&) Killing Background Processes Redirecting the Standard Error

3. Getting Started

What is a Shell? Running Scripts

Specifying the Script’s Interpreter

The PATH Environment Variable Sub-shells

4. Variables

Shell Variables

The read Command The export Command The Shell Environment Parameter Expansion Command Substitution

5. The Login Process

The Login Process

The System Profile Script Your .bash_profile Script The . Command

6. Conditional Statements

The Exit Status of Commands Command Line Examples The test Command

The if-then-else Construct The elif Construct case Statements

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7. Loops The for Loop

The while Loop

break and continue

Reading Lines From Files Using Arrays with Loops

8. Special Variables

$$ – PID of Shell

Command-Line Arguments $# – Number of Arguments $* – All Arguments The shift Command The set Command Getting Options

9. Quoting Mechanisms

Single vs. Double Quotes What is a Here Document? Using a Here Document Here Document Quoting Ignoring Leading Tabs

10. Functions

Shell Functions

Passing Arguments to Functions Returning Values from Functions Function Declarations

11. Advanced Programming

Shell Arithmetic

The select Statement

Terminal Independence in Scripts The eval Command

12. Debugging Techniques

Using echo