For anyone that comes from the Windows world you will most likely know the procedure of Showing Hidden Files and Folders by going through various GUI windows that seems to change in every new version of Windows.
As far as I can see there is no way of doing this through the GUI on the Mac so I thought I would share how its done.
Just copy this into the terminal
defaults write com.apple.finder AppleShowAllFiles TRUE
Then if you want turn them back off again, you will need to restart finder first just hold down alt and right click on the finder icon in the dock. After that its all done
To stop showing hidden files and folders just type in the same thing by change the TRUE to FALSE
defaults write com.apple.finder AppleShowAllFiles FALSE