Your Mac has a few hidden folders and files that are not visible to you . Apple hides these files and folders to stop you from changing or deleting important data that your Mac needs. But you will agree with me that there are times when you may need to view these out-of-the-way corners of your Mac's file system. Apple includes a way that you can access these hidden features in OS X, in the form of an application called Terminal. All it takes to get your Mac to spill its hidden features is a little typing in Terminal.

Using Terminal to View Hidden Folders on Your Mac. http://trendymediablog.com/2014/10/view-hidden-folders-on-your-mac-using-terminal/