Show – hide invisible files under OSX

Launch the Terminal and enter these commands exactly as shown. The first command activates the ability to see the hidden files:

defaults write com.apple.Finder AppleShowAllFiles TRUE

Now you must relaunch the Finder by killing it, this is how the changes take effect:
killall Finder

If you want to hide hidden files again (those preceded with a .) and go back to the default Mac settings, you can just type the following:
defaults write com.apple.Finder AppleShowAllFiles FALSE

Again you will need to kill the Finder so that it can relaunch for changes to take effect:
killall Finder

That’s all there is to it!