Operations for MacOS environment 修改默认截图格式：defaults write com.apple.screencapture type jpg;killall SystemUIServer https://git-scm.com/book/zh/v2/Git-%E5%9F%BA%E7%A1%80-%E8%8E%B7%E5%8F%96-Git-%E4%BB%93%E5%BA%93