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Toggle hidden files on macOS: Command + Shift + .
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defaults write com.apple.Finder AppleShowAllFiles false
#Change 'false' by 'true' to show hidden files
killall Finder
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#1 - Open your Macintosh HD folder
#2 - Press Command + Shift + . (period)
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>> To show hidden files, hold down: Cmd + Shift + . (dot)
>> Hold down Cmd + Shift + . (dot) a second time to hide the files again.