1.去除mac自带截图阴影效果（先后执行以下两行命令）
defaults write com.apple.screencapture disable-shadow -bool TRUE
Killall SystemUIServer
2.mac隐藏和显示隐藏文件(夹)
显示defaults write com.apple.finder AppleShowAllFiles -bool true
隐藏defaults write com.apple.finder AppleShowAllFiles -bool false
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