🔹 Introduction

Linux and Shell Scripting are essential skills for any DevOps Engineer. From automation to deployment, they play a crucial role in streamlining processes and ensuring efficiency in software development and infrastructure management.

Let's dive into the fundamentals of Linux, Shell Scripting, Bash Basics, and Common Commands that every DevOps Engineer should know! 🛠️

🔹 What is Linux?

Linux is an open-source, Unix-like operating system that powers servers, cloud platforms, and DevOps tools. It offers stability, security, and flexibility, making it the preferred OS for DevOps and system administrators.

🔥 Why is Linux Important in DevOps?

✔️ Most cloud services (AWS, Azure, GCP) run on Linux.
✔️ Supports automation tools like Docker, Kubernetes, Ansible, Terraform.
✔️ Provides powerful scripting capabilities for automation.
✔️ Secure and customizable environment for deployments.

🔹 What is Shell Scripting?

A shell script is a program written in Bash or other Unix shell languages that automates repetitive tasks. It executes a series of commands in a structured manner.

📌 Why Use Shell Scripting?

🔹 Automates system tasks (file management, backups, log monitoring).
🔹 Improves efficiency by reducing manual work.
🔹 Helps in server provisioning and deployments.
🔹 Integrates with DevOps tools for CI/CD pipelines.

🔹 Use of Shell Scripting in DevOps

Shell scripting is widely used in DevOps for:

✅ CI/CD Pipelines: Automating builds, testing, and deployments.

✅ Infrastructure Automation: Managing servers, containers, and cloud services.

✅ Configuration Management: Ensuring system configurations are up-to-date.

✅ Monitoring & Logging: Automating system monitoring and log analysis.

✅ Backup & Recovery: Automating backup jobs and disaster recovery plans.

🔹 Basic Linux Commands 🖥️

Here are some essential commands every DevOps engineer should know:

📁 File & Directory Management

📌 ls – List files and directories
📌 pwd – Show current directory path
📌 cd – Change directory
📌 mkdir new_folder – Create a new folder
📌 rm -rf folder_name – Delete a folder

📑 File Operations

📌 touch file.txt – Create an empty file
📌 cat file.txt – View file contents
📌 echo "Hello" > file.txt – Write to a file
📌 cp file1.txt file2.txt – Copy a file
📌 mv file1.txt new_location/ – Move or rename a file

🔹 Working with vim

vim is a powerful text editor in Linux, commonly used for editing configuration files and scripts.

📌 Basic vi Commands

✔️ Open a file: vi filename

✔️ Insert mode (editing text): Press i

✔️ Save changes & exit: Press Esc , type :wq! and press Enter

✔️ Exit without saving: Press Esc type :q! and press Enter

✔️ Undo last change: Press u

✔️ Delete a line: Press dd

🔎 Searching & Monitoring

📌 grep "error" logfile.log – Search for text in files
📌 find /home -name "*.log" – Find files by name
📌 ps aux – Display running processes
📌 top – Monitor system performance
📌 df -h – Check disk space usage
📌 free – Display memory usage
📌 free -g – Show memory usage in GB
📌 nproc – Display the number of available processors
📌 man <command> – Display the manual for a command

🔹 Conclusion 🎯

Mastering Linux and Shell Scripting is a must for every DevOps Engineer. It helps in automation, configuration management, and optimizing deployment pipelines.

By learning: ✔️ Linux basics & commands – You can navigate and manage systems efficiently.
✔️ Shell scripting – You can automate tasks and improve workflow.
✔️ DevOps applications – You can build scalable and reliable CI/CD pipelines.

💡 Keep practicing, automate tasks, and become a DevOps pro! 🚀

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

🐧 Linux & Shell Scripting for DevOps Engineers : Part - 1🚀