To view hidden folders:
- Open the Terminal (located in /Applications/Utilities/)
- At the command prompt type
defaults write com.apple.finder AppleShowAllFiles -bool true
- Press return to execute the command.
- For the changes to take effect, either log out then log back in again, or relaunch Finder (this can be done from the Force Quit Window or by typing 'killall Finder' in a Terminal window).
- Open the Terminal
- At the command prompt type
defaults write com.apple.finder AppleShowAllFiles -bool false
- then press return to execute the command.
- Log out then back in again, or relaunch Finder (explained above).
http://guides.macrumors.com/Viewing_hidden_files_on_a_Mac