Quick Reference

Short, practical guides you can look up mid-task. No fluff — just the commands you need and when to use them.

Guides

• File Permissions — chmod, chown, and chgrp on macOS: common patterns, octal numbers, real-world scenarios, and a decision tree.
• Listening Ports — How to see what's listening on your ports, investigate unknown processes, and cleanly stop unwanted services.
• MkDocs — Quickstart, config reference, useful plugins, deployment options, and a CLI cheat sheet.
• Docker — Images, containers, Compose, volumes, networks, cleanup, and a quick-reference table.