Mac OS X Finder does not show hidden (.dot) files and folders. Usually administrator will go in the Terminal and browses those hidden files and folders. This command will display all hidden files and folders.
defaults write com.apple.Finder AppleShowAllFiles -bool true
To make the command take effect, you need to restart the Finder.
killall Finder
Revert to the default setting:
defaults write com.apple.Finder AppleShowAllFiles -bool false
Restart Finder
Screencast:
*killall Finder
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