The Mac OS X command line interface is home to thousands of programs that the average user doesn’t know exists. Leveraging years of hard work by the GNU foundation and others in the open source community, Apple designed a wonderful OS that doesn’t “need” any use of the command line. While using the command line in Mac OS X is not necessary for the every day operation of a Macintosh, but if harnessed correctly, it can save you a lot of time, and occasionally give you a laugh.