Mac OSX’s Finder by default does not show hidden files and folders and in the OSX menu ther is no option to enable this feature. Anyway, using the commands shell (the Terminal application) it is possible to enable or disable the visualization of hidden files and folders.

1. Open the Terminal application in Mac OSX
2. To enable the visualization of hidden files and folders, enter the followings commands:

   defaults write com.apple.Finder AppleShowAllFiles YES
   KillAll Finder

3. To disable the visualization of hidden files and folders, enter the followings commands::

   defaults write com.apple.Finder AppleShowAllFiles NO
   KillAll Finder