🐧 Linux & Shell Scripting for DevOps Engineers : Part - 2🚀

🔹 Introduction

This is Part 2 of our Linux and Shell Scripting series for DevOps Engineers. In this section, we will cover Bash, Shebang (#!), Control Statements, and Functions in Shell Scripting. These concepts are essential for writing efficient automation scripts and managing DevOps workflows.

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🔹 What is Bash?

Bash (Bourne Again Shell) is a command-line interpreter and scripting language used in Linux. It is the default shell in most Unix-based systems and is widely used for automation and server management in DevOps.

📌 Key Features of Bash

✔️ Supports variables, loops, and functions.
✔️ Can execute system commands and automate tasks.
✔️ Used in CI/CD pipelines and infrastructure automation.
✔️ Provides command history and scripting capabilities.

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🔹 What is Shebang (#!)?

A shebang (#!) is the first line in a shell script that tells the system which interpreter to use to execute the script.

Example:

#!/bin/bash

This means the script will be executed using the Bash shell.

Other common shebangs:

• #!/bin/sh – Uses the default shell.

• #!/usr/bin/python3 – Runs a Python script.

• #!/usr/bin/env bash – Finds and uses Bash dynamically.

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🔹 Control Statements in Bash

Control statements help in decision-making and looping in scripts.

🔹 For Loop in Bash

Loops allow executing a set of commands multiple times.

#!/bin/bash
for i in {1..5}; do
  echo "Iteration: $i"
done

🔹 If Statement

Conditional execution of commands.

#!/bin/bash
num=10
if [ $num -gt 5 ]; then
  echo "Number is greater than 5"
fi

🔹 If-Else Statement

Adding alternative conditions.

#!/bin/bash
num=3
if [ $num -gt 5 ]; then
  echo "Number is greater than 5"
else
  echo "Number is 5 or less"
fi

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🔹 Functions in Bash

Functions help organize scripts into reusable code blocks.

#!/bin/bash
function greet() {
  echo "Hello, $1!"
}
greet "DevOps Engineer"

📌 Why Use Functions in Bash?

✔️ Reduces repetition in scripts.
✔️ Improves readability and maintainability.
✔️ Can be used multiple times within the same script.

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🔹 Conclusion 🎯

Mastering Bash scripting is crucial for every DevOps Engineer. Understanding shebangs, loops, conditions, and functions will help you write more efficient and structured automation scripts.

💡 Stay tuned for the next part in this series! Keep practicing, automate tasks, and become a DevOps pro! 🚀

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✉️ Got questions? Drop them in the comments! Let's learn together. 🔥