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Shell Programming

Course Objectives

Learn to read, write, and debug shell scripts.
Increase productivity by taking full advantage of the UNIX shell

Course Outline

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
Getting Started
What is a Shell?
Running Scripts
Specifying the Script’s Interpreter
The PATH Environment Variable
Sub-shells
Variables
Shell Variables
The read Command
The export Command
The Shell Environment
Variable Substitution
Command Substitution
The Login Process
The Login Process
The System Profile Script
Your .profile Script
The . Command
Conditional Statements
The Exit Status of Commands
Command Line Examples
The test Command
The if-then-else Construct
The elif Construct
case Statements
Loops
The for Loop
The while Loop
Reading Lines From Files
Using Arrays with Loops
Special Variables
$$ – PID of Shell
Command-Line Arguments
$# – Number of Arguments
$* – All Arguments
The shift Command
The set Command
Getting Options
Quoting Mechanisms
Single vs. Double Quotes
What is a Here Document?
Using a Here Document
Here Document Quoting
Ignoring Leading Tabs
Functions
Shell Functions
Passing Arguments to Functions
Returning Values from Functions
Function Libraries
Advanced Programming
Shell Arithmetic
The select Statement
Terminal Independence in Scripts
The eval Command
Debugging Techniques
Using echo
Using Standard Error
Options for Debugging
Script Tracing
Conditional Debugging
Shell IPC
Co-processes
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Shell Programming
The print and read Commands
Signals
The trap Command
Named Pipes
The wait Command

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