Linux

Browse 86+ commands with syntax, options, and examples.

Begin with file permissions - fundamental to Linux security.

Master the Unix permission system with chmod, chown, and access control lists.

Create, modify, and manage users and groups on Linux systems.

Control, monitor, and troubleshoot Linux processes effectively.

Automate tasks with cron, systemd timers, and at commands.

Install, update, and manage software with apt, dnf, pacman, and more.

Control system services with systemctl, create custom services, and understand systemd.

Write robust Bash scripts with proper error handling, variables, and control flow.

Secure your SSH server and client configuration. Key-based auth, hardening, and tunnels.