Shell Scripting UNIX/Linux Training Course

Introduction

• Course Objectives
• Schedule of Events
• Participant Introductions
• Prerequisite Knowledge
• Reference Materials
• Participant Obligations
• Curriculum Overview

Foundational Concepts - Optional Review

• File Management Fundamentals
• Directory Structures and Process Management
• Directory Listing - ls Command
• Accessing Documentation - man Command
• File Content Display - cat, more Commands
• Basic Command Operations
• Piping Output - | Symbol
• Output Redirection - > Symbol
• Append Redirection - >> Symbol
• Input Redirection - < Symbol
• Error Output Handling
• Utilizing /dev/null for Discarding Output
• Foreground Process Execution
• Background Process Execution - & Symbol
• Process Termination - kill Command
• Special Directory References - . and ..
• Command Prompt Configuration - PS1
• Alias Creation and Management
• Alias Execution
• Command History Navigation
• Command Line Editing - Arrow Keys
• Command Line Editing - vi Mode
• Shell Environment Customization
• Home Directory Configuration - HOME Variable
• Current Working Directory Identification - pwd Command
• Directory Navigation - cd Command
• Directory Creation - mkdir Command
• Directory Removal - rmdir Command
• Interactive File Copying - cp -i Option
• Interactive File Relocation - mv -i Option
• Interactive File Deletion - rm -i Option
• Recursive Directory Removal - rm -r Option
• Filename Generation - Wildcard Characters
• Word and Line Counting - wc Command
• File Search Operations - find Command
• Text Searching and Manipulation - grep, sort, cut, uniq, tr Commands
• Permission Modification - chmod Command

Shell Scripting Fundamentals

• Script Development Procedures
• Command Validation Techniques
• Script File Initialization
• Execution Permission Assignment
• Script Verification Testing
• Execution Timing Analysis - time Command
• Environment Source Execution - Dot Command
• Process Replacement Execution - exec Command
• Shell-Specific Execution - ksh Command
• Script Debugging Methodologies
• Argument Passing Mechanisms
• Input Acquisition - read Command
• Interactive Input Handling in Scripts
• Shell Selection Criteria
• Output Formatting and Alignment
• Input Suppression - stty Command

Special Characters and Variable Management

• Quotation Syntax
• Literal String Definition - ", '
• Escape Sequence Handling - *
• Command Substitution - `
• Modern Command Substitution - $(...)
• System Variable Inspection - set Command
• Environment Variable Management
• User-Defined Variables
• Variable Removal - unset Command
• Variable Scope in Scripts
• Variable Type Definition - Typeset Command
• Integer Arithmetic Variables
• Advanced Variable Constructs

Interactive Menu Development

• Control Structures - case Statement
• Menu Interface Construction
• Loop Control - while, until Statements
• Process Delay Implementation - sleep Command
• Input Hold via Dummy Read
• Script Termination Procedures
• Loop Termination Logic
• Concurrent Execution - Shell Forking
• Signal Handling - trap Command
• Interrupt Management Strategies
• Text Formatting and Highlighting - tput Command
• Cursor Positioning Control - backtab \b
• Korn Shell Menu Implementation

Conditional Logic and Selection

• Conditional Evaluation Frameworks
• File Attribute Validation
• Permission Level Verification
• Complex Conditional Logic - Nested ifs
• Alternative Conditional Branching - elseif
• Negation Operators
• Composite Condition Testing
• String Comparison Operations
• Bracket Notation Usage
• Null Input Prevention
• Numeric Comparison Testing
• Extended Case Statement Applications
• Variable Output Display
• Whitespace Formatting
• Command Execution Testing

Iteration and Loop Structures

• Arithmetic Evaluation - let Command
• Loop Constructs - while, until Statements
• Infinite Loop Implementation
• Iteration Constructs - for Statement
• Parameter Shift Handling - shift Command

Modular Scripting: Sub-scripts and Functions

• Variable Scope: Local versus Global
• Nested Script Execution
• Variable Exportation - Export Command
• Exit Status Interpretation
• Alias Implementation in Functions
• Function Definition and Invocation
• Standard Utility Functions
• Return Value Management
• Function Manipulation Techniques
• Integration of Functions within Scripts

Advanced System Commands

• Debugging Mode Activation - set Command
• Shell Option Configuration - set Command
• File Joining Operations - join Command
• File Merging and Path Manipulation - paste, basename, dirname Commands
• Job State Monitoring - jobs Command
• Regular Expression Fundamentals
• Pattern Searching - grep Command
• Extended Pattern Searching - egrep Command
• Fixed String Searching - fgrep Command
• Arithmetic Evaluation - expr Command
• Mathematical Computations - bc, eval Commands
• Command-Line Argument Parsing
• Option Parsing - getopts Command
• Array Data Structure Implementation

Advanced Text Editing: vi & sed

• vi Key Binding Configuration
• Control Key Mapping
• Abbreviation Expansion
• Multi-File Editing Workflows
• Regular Expression Syntax
• Global Text Insertion
• Here Document Syntax
• Stream Processing - sed Operations: delete (-d), print (-p), suppress (-n), quit (-q), file input (-f), multiple input handling
• Find and Replace Operations
• sed Implementation Examples

Text Processing with awk

• awk Programming Language Overview
• Pattern Matching Techniques
• Regular Expression Application
• Comparison-Based Patterns
• Compound Pattern Logic
• Range-Based Patterns
• Special Pattern Handling
• Built-in Function Library
• awk Script Troubleshooting
• Parameter Passing Mechanisms
• Substring Operations - Contains
• Formatted Output - printf Function
• Arithmetic Operations within awk
• Custom Function Definitions
• String Substitution - substr Function
• String Length Calculation - length Function
• Action Statement Syntax
• Control Flow Statements
• Array Data Structures in awk
• Array Iteration via for Loops
• Practical awk Examples