The default interactive shell is now zsh. To update your account to use zsh, please run `chsh -s /bin/zsh`. For more details, please visit https://support.apple.com/kb/HT208050. Github-Id-VampireAchao:~ achao$ cd ~/IdeaProjects/ Github-Id-VampireAchao:IdeaProjects achao$ mkdir simple-cheerpj Github-Id-VampireAchao:IdeaProjects achao$ cd simple-cheerpj/ Github-Id-VampireAchao:simple-cheerpj achao$ touch index.html Github-Id-VampireAchao:simple-cheerpj achao$ vim index.html Github-Id-VampireAchao:simple-cheerpj achao$ ls index.html Github-Id-VampireAchao:simple-cheerpj achao$ mv ~/Downloads/TextDemo.jar . Github-Id-VampireAchao:simple-cheerpj achao$ ls TextDemo.jar index.html Github-Id-VampireAchao:simple-cheerpj achao$ npx http-server -p 8080 Starting up http-server, serving ./