References Linux command cheat sheet Google "linux command cheat sheet", and choose the one you like Here are some references: Linux Command Line Cheat Sheet bash-cheatsheet.sh Linux Tutorial - Cheat Sheet Git and github git & github git-简明指南 Contributing to repository Markdown https://guides.github.com/features/mastering-markdown/ 回顾课程: 用HTML胶片 https://github.com/caodg/slidedemo