In this Shell Programming training, students learn to read, write, and debug Korn shell scripts. Back at work they can greatly increase productivity by automating repetitive tasks (for themselves or others), and by creating specifically tailored utilities designed to meet their precise needs. Students will read and write many shell scripts in this class, which will additionally increase their overall UNIX knowledge and skills.

The course is intended for UNIX users, programmers, and system administrators.

Class Goals

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

Class Outline

UNIX Processes
1. What is a Process?
2. Process Structure
3. The ps Utility
4. Options to the ps Utility
5. Background Commands
6. Killing Background Processes
7. Redirecting the Standard Error
Getting Started
1. What is a Shell?
2. Running Scripts
3. Specifying the Script's Interpreter
4. The PATH Environment Variable
5. Sub-shells
Variables
1. Shell Variables
2. The read Command
3. The export Command
4. The Shell Environment
5. Variable Substitution
6. Command Substitution
The Login Process
1. The Login Process
2. The System Profile Script
3. Your .profile Script
4. The . Command
Conditional Statements
1. The Exit Status of Commands
2. Command Line Examples
3. The test Command
4. The if-then-else Construct
5. The elif Construct
6. case Statements
Loops
1. The for Loop
2. The while Loop
3. Reading Lines From Files
4. Using Arrays with Loops
Special Variables
1. $$ - PID of Shell
2. Command-Line Arguments
3. $# - Number of Arguments
4. $* - All Arguments
5. The shift Command
6. The set Command
7. Getting Options
Quoting Mechanisms
1. Single vs. Double Quotes
2. What is a Here Document?
3. Using a Here Document
4. Here Document Quoting
5. Ignoring Leading Tabs
Functions
1. Shell Functions
2. Passing Arguments to Functions
3. Returning Values from Functions
4. Function Libraries
Advanced Programming
1. Shell Arithmetic
2. The select Statement
3. Terminal Independence in Scripts
4. The eval Command
Debugging Techniques
1. Using echo
2. Using Standard Error
3. Options for Debugging
4. Script Tracing
5. Conditional Debugging
Shell IPC
1. Co-processes
2. ITCourseware, LLC 2
3. Shell Programming
4. The print and read Commands
5. Signals
6. The trap Command
7. Named Pipes
8. The wait Command

Class Materials

Each student in our Live Online and our Onsite classes receives a comprehensive set of materials, including course notes and all the class examples.

Class Prerequisites

Experience in the following areas is required:

Basic knowledge of the fundamentals of UNIX

Technical Requirements

Our computer technical requirements and setup process is easy, with support just a click away.

Instructor-led Online course technical requirements and setup instructions.
WebEx system requirements for Instructor-led Online delivery option.
Onsite course technical requirements and setup instructions.

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