A collection of links that I find useful. Also available in GitHub.

Bash

• Parse command line arguments
• What is the difference between test, [ and [[ ?

Batch

• CMD Command Cheat Sheet
  • Redirect output

Cron

• Crontab Guru: quick and simple editor for cron schedule expressions

Docker

• FROM:latest: Dockerfile linter

Google data visualization

• Geo Heatmap
• YouTube Report

LUKS full disk encryption

• Unlock with Dropbear

NGINX

• Nginx location match tester

Python

• Python Cheatsheet

Ruby

• Rubular: regular expression editor

SpeedTests

• fast
• LibreSpeed

Windows

• Windows 10 Privacy Guide