Unix Shell Programming

Goals

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

Outline

1. 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
2. Getting Started
   1. What is a Shell?
   2. Running Scripts
   3. Specifying the Script’s Interpreter
   4. The PATH Environment Variable
   5. Sub-shells
3. Variables
   1. Shell Variables
   2. The read Command
   3. The export Command
   4. The Shell Environment
   5. Variable Substitution
   6. Command Substitution
4. The Login Process
   1. The Login Process
   2. The System Profile Script
   3. Your .profile Script
   4. The . Command
5. 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
6. Loops
   1. The for Loop
   2. The while Loop
   3. Reading Lines From Files
   4. Using Arrays with Loops
7. 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
8. 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
9. Functions
   1. Shell Functions
   2. Passing Arguments to Functions
   3. Returning Values from Functions
   4. Function Libraries
10. Advanced Programming
    1. Shell Arithmetic
    2. The select Statement
    3. Terminal Independence in Scripts
    4. The eval Command
11. Debugging Techniques
    1. Using echo
    2. Using Standard Error
    3. Options for Debugging
    4. Script Tracing
    5. Conditional Debugging
12. 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

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