🐧 Linux Basics

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🐧 Linux Fundamentals

Learn the Foundation of Linux Operating System

📖 What is Linux?

Linux என்பது Open Source Operating System ஆகும்.

1991 ஆம் ஆண்டு Linus Torvalds என்பவரால் Linux உருவாக்கப்பட்டது.

Linux = Free + Open Source + Secure + Powerful

📜 History of Linux

1991 - Linux Kernel உருவாக்கப்பட்டது.

1992 - GNU Tools இணைக்கப்பட்டன.

2000+ - Enterprise Servers Linux பயன்படுத்த தொடங்கின.

இன்று Cloud, Telecom, AI, Cyber Security ஆகிய துறைகளில் Linux முக்கிய பங்கு வகிக்கிறது.

🎯 Why Linux?

✔ Open Source

✔ Highly Secure

✔ Stable Performance

✔ Multi User Support

✔ Multi Tasking

✔ Server Friendly

✔ Cloud Ready

✔ Powerful Networking Features

🏗 Linux Architecture

Hardware

Kernel

Shell

System Utilities

User Applications

Hardware → Kernel → Shell → Applications

⚙ Linux Kernel

Kernel என்பது Linux Operating System-ன் இதயம்.

✔ Memory Management

✔ Process Management

✔ Device Control

✔ Network Management

✔ File System Control

🐧 Linux Distributions

Ubuntu

Debian

CentOS

Rocky Linux

Red Hat Enterprise Linux (RHEL)

Fedora

Kali Linux

OpenSUSE

📂 Linux File System

Linux File System Root Directory ( / )-இல் இருந்து தொடங்குகிறது.

அனைத்து Files மற்றும் Directories இந்த Root Directory-க்குள் இருக்கும்.

📁 Important Directories

/ → Root Directory

/home → User Files

/etc → Configuration Files

/var → Logs

/usr → User Programs

/boot → Boot Files

/tmp → Temporary Files

/dev → Devices

📄 Linux File Types

Regular File

Directory

Symbolic Link

Block Device

Character Device

Socket

Named Pipe

👥 Users & Groups

Root User

Normal User

System User

Linux Multi User Operating System ஆகும்.

🔐 Linux Permissions

Read (r)

Write (w)

Execute (x)

Example:

rwxr-xr-x

🚀 Linux Boot Process

1. BIOS / UEFI

2. GRUB Boot Loader

3. Kernel Loading

4. Systemd / Init

5. Services Start

6. User Login

🌟 Advantages of Linux

✔ Free

✔ Secure

✔ Fast

✔ Stable

✔ Flexible

✔ Cloud Ready

✔ Server Friendly

✔ Network Friendly

🌍 Real World Usage

✔ Telecom Networks

✔ ISP Infrastructure

✔ RailTel Networks

✔ Data Centers

✔ Cloud Platforms

✔ AI Servers

✔ Cyber Security Labs

✔ Banking Systems

🌐 Linux for Network Engineers

Network Engineers மற்றும் Telecom Engineers-க்கு Linux மிகவும் முக்கியமான Skill ஆகும்.

DNS, DHCP, Firewall, Proxy, VPN, Monitoring Servers ஆகியவை Linux அடிப்படையில் இயங்குகின்றன.

Linux + Networking = High Demand Career

🎤 Interview Questions

What is Linux?

Who created Linux?

What is Kernel?

What are Linux Distributions?

What is Root User?

What is Linux File System?

What are Linux Permissions?

Explain Linux Boot Process.

Why Linux is Popular in Servers?

Difference Between Linux and Windows?

📝 Summary

Linux என்பது உலகின் மிகவும் பிரபலமான Open Source Operating System ஆகும்.

Networking, Cloud, Cyber Security, AI மற்றும் Telecom Technologies-ன் அடித்தளமாக Linux உள்ளது.

Linux Basics-ஐ நன்றாக புரிந்துகொள்வது Linux Administration மற்றும் Server Management கற்றுக்கொள்ள உதவும்.

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