Linux is one of the most widely used open-source operating systems. It's fast, secure, stable, and powers everything from smartphones and servers to cloud platforms and IoT devices. Linux is especially popular among developers, system administrators, and DevOps professionals.
- A Unix-like OS used in servers, cloud infrastructure, supercomputers, personal computers and embedded systems.
- Reliable and secure, making it ideal for web hosting, networking, and automation.
- Preferred in DevOps, where it's used for scripting, configuration, containerization (Docker), and CI/CD pipelines.
- Open-source and customizable, giving users full control over their systems and workflows.
Understanding Linux Basics
This section introduces what Linux is, how it works, and foundational concepts.
Linux File System
Understand the structure, file types, paths, and navigation.
- File System
- File Hierarchy Structure
- Directory Structure
- File System Navigation Commands
- Absolute and Relative Pathnames in UNIX
Linux Commands
Learn essential terminal commands used for navigation, file management, system monitoring, and basic operations.
File Management & Permissions in Linux
Detailed operations for working with files and directories.
- File Management
- Directory Management
- Permissions
- Changing Permissions using chmod
- Changing Ownership using chown
Archiving and Compressing
- Creating and Extracting Archives using tar
- Compressing Files using gzip
- Decompressing Files using gunzip
- Compressing and Extracting Files using zip and unzip
- High-Compression Archiving using bzip2
- High-Efficiency Compression using xz
Package Management
Learn how software is installed, updated, and removed on different Linux distributions.
- Package Managers & systemctl
- apt-get Package Manager (Debian/Ubuntu)
- dpkg – Debian Package Manager
- dnf Package Manager (Fedora/RHEL 8+)
- yum Package Manager (CentOS/RHEL)
User and Group Management
Managing users and groups in Linux involves creating, modifying, and controlling user accounts, assigning permissions, and organizing users into groups for efficient access control and system security.
- User Management
- Creating Users
- Creating Users Interactively
- Deleting Users
- Managing User Passwords
- Viewing User Information
- Group Management
- Managing Groups
- Creating Groups
- Deleting Groups
- Checking User Group Membership
- Managing Administrative Access
Linux Networking
Configuring IP addresses and managing network interfaces to setting up firewalls, monitoring traffic, and enabling communication between devices and servers:
- Configuring Network Interfaces
- Managing IP Addresses and Interfaces
- Managing Network Connections
- Testing Network Connectivity
- Monitoring Network Connections
- Inspecting Socket Statistics
- Tracing Network Routes
Networking Services
Linux Firewall
Monitoring & Troubleshooting
Process Management
Learn how Linux creates, monitors, and controls running processes, including foreground, background, and system processes.
- Viewing Processes
- Real-Time Process Monitoring
- Enhanced Process Monitoring
- Managing Processes
- Controlling Process Priority
Managing Background and Foreground Jobs
System Services & systemd
Understand how Linux services are managed and controlled using systemd, including the boot process, service lifecycle, and logging.
System Monitoring
Monitor system resources, performance, and running processes to ensure Linux system stability and efficiency.
- Checking Disk Space
- Monitoring Memory Usage
- Viewing CPU Information
- Checking System Uptime and Load
- Monitoring CPU and I/O Performance
- Listing Open Files and Processes
Linux Practical Guides for System Administration
Hands-on guides for real-world Linux administration tasks.
- Enabling SSH
- Installing JDK
- Installing Atom Editor
- Installing Ubuntu on VMware in Windows
- SCP Command for Secure File and Folder Transfer
- Installing and Configuring Nginx from Source
Shell Scripting
Shell scripting is writing a series of commands in a script file to automate repetitive tasks.
Creating and Running Shell Scripts
- Creating a Shell Script
- Defining the Shell Script Interpreter
- Comments in the Shell Script
- Storing and Displaying Messages in a Shell Script
- Storing the Output of Commands
- Exit Codes of Shell Commands
Variables in Shell Scripting
Bash Scripting
- Bash Scripting
- Define Bash Variables and Its Types
- Working
- Run Bash Script
- Functions
- Difference between Shell (sh) and Bash
- Basic Operators
Advanced Topics in Shell Scripting
Linux Cloud
- Linux in Cloud Computing and DevOps
- Linux commands in DevOps
- Deploying and Managing Linux in the Cloud
Linux Interview Questions
Here are the top 90 most commonly asked Linux interview questions, covering essential topics like commands, shell scripting, system administration, networking, and troubleshooting: