Mac OS: show hidden files in Finder

• Show hidden files in Finder:
• Mac OS Mavericks and later (version >= 10.9):

  defaults write com.apple.finder AppleShowAllFiles TRUE; killall Finder
  

• Mac OS Mountain Lion and before (version <= 10.8):

  defaults write com.apple.Finder AppleShowAllFiles TRUE; killall Finder
  

• Revert it back: Do not show hidden files in Finder:
• Mac OS Mavericks and later (version >= 10.9):

  defaults write com.apple.finder AppleShowAllFiles FALSE; killall Finder
  

• Mac OS Mountain Lion and before (version <= 10.8):

  defaults write com.apple.Finder AppleShowAllFiles FALSE; killall Finder