Linux Survival Basics
The commands to inspect a machine before guessing.
Risk mix: 48 read-only
topics
Browse broad command areas
Find commands by operating area, with counts and a plain risk mix for each topic. Use Problems for specific repair paths like disk full, Nginx 502, or SSH publickey errors.
6 topics
Topic catalog
Web Server Rescue
Small checks that separate DNS, TLS, Nginx, and app failures.
Risk mix: 21 read-only
Dangerous Commands
Commands worth understanding before copying from the internet.
Risk mix: 1 read-only, 2 preview, 1 state-changing
Cybersecurity Triage
Defensive commands for checking exposure, logs, permissions, and suspicious activity.
Risk mix: 65 read-only, 4 preview
Hosting Operations
Web hosting, SSL, DNS, Nginx, deployment, backups, and VPS management.
Risk mix: 128 read-only, 1 preview, 4 state-changing
Apple Terminal
macOS and Apple-adjacent terminal workflows for developers and power users.
Risk mix: 8 read-only, 2 state-changing