Today, in my #90DaysOfDevOps journey, I focused on mastering the basics of Linux shell scripting—a foundational skill for any aspiring DevOps engineer. By understanding the relationship between the kernel and shell, you gain the power to automate tasks, manage servers, and streamline workflows.

What is the Kernel?
In Linux, the kernel is the core of the operating system, handling everything from hardware management to task scheduling. Without the kernel, your system wouldn’t be able to manage processes or allocate resources.

What is a Shell?
The shell is a command interpreter that bridges the gap between the user and the kernel. When you type a command in a terminal, the shell interprets it and instructs the kernel to perform the requested action. Common shells include bash, sh, and zsh.

Why Should DevOps Engineers Learn Shell Scripting?
DevOps is all about automation, and shell scripting is the go-to solution for automating routine tasks in Linux environments. From automating backups to configuring servers, shell scripts save time and reduce errors.

Example Tasks and Solutions:
What is #!/bin/bash? The shebang (#!/bin/bash) is used to tell the system which shell interpreter to use for the script. In this case, we’re using bash. While #!/bin/sh can also be used, it has fewer features than bash.

Simple Bash Script to Motivate Yourself:

#!/bin/bash
echo "I will complete #90DaysOfDevOps!"
Taking Input from the User:

#!/bin/bash
echo "Enter your name: "
read name
echo "Hello, $name!"
Using If-Else to Compare Two Numbers:

_#!/bin/bash
num1=15
num2=20

if [ $num1 -gt $num2 ]; then
echo "$num1 is greater than $num2"
else
echo "$num1 is less than or equal to $num2"
fi_

Takeaways from Day 4:
Shell scripting is not just about writing code; it’s about creating a smoother, more efficient workflow in a DevOps environment. Automation is key in DevOps, and shell scripting helps eliminate manual tasks while improving system reliability.

I’m excited to explore more complex scripts as I continue my journey through #90DaysOfDevOps. Stay tuned for more hands-on experiences and tips!

DevOps #Linux #BashScripting #Automation #CloudComputing #ShellScripting #DevOpsCommunity