Bash Scripting Guide - Case Studies and Examples

This section provides real-world case studies and practical examples to reinforce your understanding of Bash scripting concepts.

Table of Contents

1. Basic Script Structure
2. File and Directory Manipulation
3. Working with Arrays
4. Advanced Control Structures
5. Input Validation and Error Handling
6. Creating a Simple Menu
7. Text Processing with awk
8. Recursive File Operations
9. Background Processes and Job Control
10. Interactive Scripting

1. Basic Script Structure

In this example, we'll create a simple Bash script to understand the basic structure and execution of scripts.

#!/bin/bash

# Your script code here
echo "Hello, World!"

2. File and Directory Manipulation

Explore how to manipulate files and directories using Bash scripting.

#!/bin/bash

# Your script code here
mkdir my_directory
cd my_directory
touch new_file.txt

3. Working with Arrays

Learn how to use arrays in Bash scripts.

#!/bin/bash

# Your script code here
fruits=("Apple" "Banana" "Orange")
for fruit in "${fruits[@]}"; do
  echo "I like $fruit"
done

4. Advanced Control Structures

See examples of advanced control structures, including nested loops and conditionals.

#!/bin/bash

# Your script code here
for ((i=1; i<=5; i++)); do
  for ((j=1; j<=i; j++)); do
    echo -n "* "
  done
  echo
done

5. Input Validation and Error Handling

Learn how to validate user input and handle errors gracefully.

#!/bin/bash

# Your script code here
read -p "Enter a number: " num
if ! [[ "$num" =~ ^[0-9]+$ ]]; then
  echo "Error: Not a valid number."
  exit 1
fi
echo "You entered: $num"

6. Creating a Simple Menu

Build a simple menu system for user interaction.

#!/bin/bash

# Your script code here
echo "Choose an option:"
select option in "Option 1" "Option 2" "Option 3"; do
  case $option in
    "Option 1") echo "You selected Option 1"; break;;
    "Option 2") echo "You selected Option 2"; break;;
    "Option 3") echo "You selected Option 3"; break;;
    *) echo "Invalid option";;
  esac
done

7. Text Processing with awk

Explore text processing using the awk command in Bash scripts.

#!/bin/bash

# Your script code here
echo "John Doe,25" | awk -F ',' '{print "Name: " $1, "Age: " $2}'

8. Recursive File Operations

Learn how to perform recursive file operations, such as searching for files in nested directories.

#!/bin/bash

# Your script code here
find . -type f -name "*.txt" -exec echo "Found file: {}" \;

9. Background Processes and Job Control

Understand how to work with background processes and job control in Bash.

#!/bin/bash

# Your script code here
./background_process.sh &
echo "Script continues while background process runs."

10. Interactive Scripting

Create an interactive script that takes user input and provides real-time feedback.

#!/bin/bash

# Your script code here
read -p "Enter your name: " name
echo "Hello, $name! Welcome to the interactive script."

These examples cover various aspects of Bash scripting, from basic structures to more advanced concepts. Use them as templates and modify them according to your specific scripting needs.

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