Linux

This comprehensive guide covers Linux system administration, usage, and best practices. Whether you're a beginner or an experienced user, you'll find valuable information about Linux system management, security, and operations.

📚 Core Topics

🛠 System Administration

• User and Group Management

• Permissions

• Services

• Package Management

📂 File Operations

• Basic Commands

• Files and Directories

• Archiving

• Copy Operations

🔒 Security

• Authorization

• Security Best Practices

• Network Security

🖥 System Information

• Hardware Information

• Operating System Details

• System Monitoring

• Process Management

• Boot Process

🔧 Development Tools

• Shell Scripting

• VI Editor

• Shell Environment

🎯 Learning Path

1. Basics

   • Start with Basic Commands

   • Learn File Operations

   • Understand Permissions

2. System Management

   • User and Group Management

   • Service Management

   • Package Management

3. Advanced Topics

   • Security

   • Shell Scripting

   • Network Configuration

4. Best Practices

   • System Monitoring

   • Security Hardening

   • Performance Optimization

💡 Quick Tips

• Use man command for detailed documentation

• Always backup before major changes

• Test commands in a safe environment first

• Keep system updated regularly

• Monitor system logs

🔍 Common Tasks

System Updates

# Ubuntu/Debian
sudo apt update
sudo apt upgrade

# CentOS/RHEL
sudo yum update

User Management

# Add user
sudo useradd username

# Set password
sudo passwd username

# Add to sudo group
sudo usermod -aG sudo username

File Operations

# File permissions
chmod 755 file.txt

# Copy with preservation
cp -p source dest

# Find files
find / -name "filename"

📚 Additional Resources

• Linux Documentation Project

• Ubuntu Documentation

• Red Hat Documentation

• ArchWiki