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Devhints — TL;DR for developer documentation

cheat/cheat: cheat allows you to create and view interactive cheatsheets on the command-line. It was designed to help remind *nix system administrators of options for commands that they use frequently, but not frequently enough to remember.

Markdown Cheatsheet · adam-p/markdown-here Wiki

Yum Command Cheat Sheet for Red Hat Enterprise Linux - Red Hat Customer Portal