Day 4: Shell Scripting Basics for DevOps Engineers 🚀

Hello DevOps enthusiasts! 👋 Welcome to Day 4 of the #90DaysOfDevOps challenge. Today, we're diving into shell scripting basics, a crucial skill for automation in DevOps.

Understanding the Basics 📝

What is Kernel?

The kernel is the core component of an operating system that manages:

• System resources
• Hardware communication
• Process management
• Memory management

What is Shell?

Shell is an interface between users and the kernel, allowing us to:

• Execute commands
• Automate tasks
• Manage system resources
• Process user inputs

Task Solutions 💻

1. Print Challenge Message

#!/bin/bash
echo "I will complete #90DaysOfDevOps challenge"

2. Take User Input and Arguments

#!/bin/bash
# Read user input
read -p "Enter your name: " username
echo "Hello, $username!"

# Display script arguments
echo "Script arguments: $@"

3. Compare Two Numbers

#!/bin/bash
read -p "Enter first number: " num1
read -p "Enter second number: " num2

if [ $num1 -gt $num2 ]; then
    echo "$num1 is greater than $num2"
elif [ $num1 -lt $num2 ]; then
    echo "$num1 is less than $num2"
else
    echo "Both numbers are equal"
fi

Key Components Used 🔧

1. Shebang (#!/bin/bash)

   • Tells system to use bash interpreter

2. Echo Command

   • Displays text/variables

3. Read Command

   • Captures user input

4. If-Else Statement

   • Controls program flow
   • Compares values

5. Variables

   • Store and manipulate data

Key Takeaways 💡

• Shell scripts automate repetitive tasks
• Basic constructs enable powerful automation
• User input makes scripts interactive
• Proper script structure is important

Bash #DevOps #Automation #Linux #90DaysOfDevOps

This is Day 4 of my #90DaysOfDevOps journey. Keep learning and automating!