Here’s a helpful how to if you need to create a hidden folder in Mac OS X:

1. Open Terminal.app (/Applications/Utilities)
2. At the command line, type the following: mkdir .hiddenfolder
3. Rename “hiddenfolder” to anything you would like to name your hidden folder you will be creating

And there you go, you have created a hidden folder! In order to view/show the hidden folder, here’s how:

1. Open Terminal.app (/Applications/Utilities)
2. At the command line, type the following: # defaults write com.apple.Finder AppleShowAllFiles TRUE
3. After that, type: # KillAll Finder
4. Let Finder restart, then you should be able to see that hidden folder you have created (or any other hidden files/folders)

If you want to, you can hide all the hidden folders/files while viewing Finder by doing the following:

1. Open Terminal.app (/Applications/Utilities)
2. At the command line, type the following: # defaults write com.apple.Finder AppleShowAllFiles FALSE
3. After that, type: # KillAll Finder
4. Let Finder restart, then all hidden files/folders will be hidden from view

Now, you know how to create a hidden folder, show it, and hide it!