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🚀 Linux Basics for DevOps

 🚀 Linux Basics for DevOps


🔍 Introduction

Linux is the backbone of modern IT infrastructure and a must-know operating system for DevOps professionals. This guide covers the fundamental concepts, commands, and utilities required to start with Linux.



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📌 1. Understanding Linux & Its Distributions

What is Linux?

Linux is an open-source, Unix-like operating system used for servers, cloud environments, and DevOps automation.


Popular Linux Distributions (Distros)

🔹 Ubuntu – Beginner-friendly, widely used in cloud environments.
🔹 CentOS / RHEL – Enterprise-focused with long-term support.
🔹 Debian – Stable and secure, often used for servers.
🔹 Arch Linux – Lightweight and customizable.


📌 2. Linux File System Structure

/	 (Root) - Base of the Linux file system.
/bin	 - Essential binaries (ls, cat, cp, mv).
/etc	 - System configuration files.
/home	 - User home directories.
/var	 - Variable files (logs, cache).
/tmp	 - Temporary files.
/dev	 - Device files.
/mnt	 - Mounted file systems.


📌 3. Basic Linux Commands

File & Directory Operations

ls         # List files and directories
pwd        # Show current directory
cd /path   # Change directory
mkdir new_folder  # Create a directory
rm -rf file  # Delete file or folder


File Viewing Commands

cat file.txt   # View file content
tac file.txt   # View file in reverse
head -n 10 file.txt  # Show first 10 lines
tail -n 10 file.txt  # Show last 10 lines
less file.txt  # Scroll through a file


📌 4. User & Permission Management

User Management Commands

whoami      # Show current user
id          # Display user ID and group ID
adduser devops_user  # Add a new user
passwd devops_user   # Set user password


File Permissions

ls -l file  # Show file permissions
chmod 755 file  # Change file permissions
chown user:group file  # Change file ownership


📌 5. Process & System Management

ps aux      # Show running processes
top         # Real-time system monitoring
htop        # Interactive process viewer
kill -9 PID  # Terminate a process


System Monitoring

uptime     # Show system uptime
free -m    # Display memory usage
df -h      # Show disk space usage


📌 6. Package Management

Debian-based Systems (Ubuntu, Debian)

apt update   # Update package list
apt install package_name  # Install a package
apt remove package_name   # Remove a package


Red Hat-based Systems (CentOS, RHEL)

yum update   # Update package list
yum install package_name  # Install a package
yum remove package_name   # Remove a package


📌 7. Networking Basics in Linux

ip a        # Show IP addresses
ifconfig    # Check network interfaces
ping 8.8.8.8  # Check connectivity
netstat -tulnp  # Show open ports


📌 8. Bash Scripting Basics

Creating a Simple Script

#!/bin/bash
echo "Hello, DevOps!"


Running a Script

chmod +x script.sh  # Make the script executable
./script.sh         # Execute the script


📌 Conclusion

This guide provides the foundation needed for DevOps professionals to get started with Linux. In the next section, we will take a Deep Dive into Advanced Linux Concepts, covering system administration, security, process automation, and troubleshooting.


🚀 Stay tuned for the next chapter: Linux Deep Dive!





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