The Shell as a Process

• Objectives
• Why Bother with Shell Programming?
• Kernel, Utilities, and Shell
• The Shell
• Which Shell?
• Shell History
• How Does Your System Know What Shell to Start for You?
• Shell Startup
• Traditional Terminal Login Sequence
• Processes Tables
• Shell Questions and Answers
• Excursion: UNIX System Calls
• Starting a Process in C
• Running a Program
• Who Opens the Files?
• Redirecting I/O
• Shell Process
• Foreground/Background Processing
• Additional Shell Responsibilities
• Special Shell Features
• Examples of Features of the Shell
• Summary
• Lab 1

Creating a Command File

• Objectives
• Command File
• File Creation
• File Naming Conventions
• Revisiting Unix File Permissions
• Three Ways to Execute Shell Files
• Other Ways to Execute Shell Files
• PATH Variable
• Creating an Executable Shell File
• Shell Must Locate Executable Files
• Remembering Old Friends
• Summary
• Lab 2

Error Debugging

• Objectives
• Termination of a Shell Program
• For Debugging
• exit Status
• Execution Flags
• Invocation Flags
• Error Handling
• Summary
• Lab 3

Redirection and Pipelines

• Objectives
• Redirection (>, >>, <)
• File Descriptors
• Standard Input, Standard Output, and Standard Error
• Input/Output Redirection
• Input/Output Redirection Examples
• Pipelines: Connecting Command Processes
• Pipeline Examples
• Helpful Hints Using Pipelines
• Differences Between Pipelines and Redirection
• here Document
• here Document Examples
• here Document Examples - 2
• here Document Examples - 3
• Summary
• Lab 4

Variables

• Objectives
• Definition of a Shell Variable
• Assigning Variables Example
• Assigning Variables (read)
• Assigning Variable on the Command Line
• The Values of Shell Variables
• Assigning Variables with Quotes
• Variable Assignment
• Predefined Shell Variable
• Predefined Shell Variables (Default Values)
• .bashrc File
• Predefined Shell Variable Examples
• Example of Changing .bashrc
• Shell Defined Variables (readonly)
• Summary
• Lab 5

Parameters

• Objectives
• Positional and Special Parameters to the Shell
• Shifting Positional Parameters
• Positional Parameters to the Shell
• Parameter Substitution
• Parameter Substitution Exercises
• Parameter Substitution Summary
• Summary
• Lab 6

Pattern Matching and expr

• Objectives
• Shell File Name Substitution Characters
• Shell Pattern Matching Examples
• Quoting
• Metacharacters
• Regular Expression Special Characters
• Utility Regular Expressions
• Differences between the Shell regular expressions and regular
• expressions used
• within utilities
• Evaluate an Expression
• Notes on expr
• expr examples
• Summary
• Lab 7

More on Commands

• Objectives
• Command Line Evaluation
• Command Substitution Examples
• Shell Script
• Command Delimiter Examples
• Short-Circuit Operators
• Braces and Parentheses
• Summary
• Lab 8

Exit/Test

• Objectives
• exit Status
• The test Command
• Types of Tests
• Tests on Numerical Values
• Examples Testing Numerical Values
• Tests on Files Types
• Examples Testing File Types
• Tests on Character Strings
• Examples Testing Character Strings
• Comparison of Character Strings and Numeric Strings
• Logical AND Operator
• Logical OR Operator
• Summary

Conditional Constructs

• Objectives
• Programming Concepts
• Advantages/Disadvantages of Shell Scripts
• Flow Control - if
• Flow Control - if Examples
• Flow Control - elif
• Flow Control - elif Examples
• Flow Control - case
• Flow Control - case Example
• Patterns in the case Structure
• case Examples
• Summary
• Lab 9 and 10

Looping Constructs

• Objectives
• Flow Control: for in
• Flow Control: for in Examples
• Flow Control: while
• Flow Control: while Examples
• Comparison Between for and while
• for, while Examples
• Flow Control: until
• until Examples
• Programming Notes
• Summary
• Lab 11

Shell Functions

• Objectives
• Shell Functions
• Defining a Function
• Examples
• Lab 12

Exporting

• Objectives
• Variables in Processes
• Exporting Variables
• Exporting Notes
• Exporting
• Actions on Shell Variables
• Summary
• Lab 13

Interactive Use

• Objectives
• Bourne-Again Shell
• Command Line Editing
• Command History
• Using Previous Commands
• Built-In Integer Arithmetic
• Parameter Substitution
• alias Command
• Job Control
• Starting and Stopping Jobs
• cd Command
• Tilde Substitution
• Command Substitution
• Shell Variables
• Quoting
• Quoting Examples
• Exported Variables
• Select Command
• Summary
• Lab 14

Signals and Traps

• Objectives
• Signals
• Traps
• trap Example
• Application of Signals
• Summary
• Lab 15

Built-In Commands

• Objectives
• Built-In Commands
• Advantages/Disadvantages of Built-In Commands
• Built-In Commands Summary
• Lab 16

Bourne-Again Shell

• Objectives
• Bourne-Again Shell
• Built-In Integer Arithmetic
• Parameter Substitution
• Command Substitution
• Shell Variables
• Quoting
• Quoting Examples
• Exported Variables
• Select Command
• Summary
• Lab 17

Unix Power Tools

• Objectives
• find
• diff
• ed
• dc
• join
• comm
• sed
• tail
• Summary
• Lab 18