Oxygen O2 allows Mac OS X users to utilize the powerful UNIX tools without having to memorize, or even look up UNIX commands. Oxygen O2 not only runs the useful UNIX calls, but formats their returns into clean, and easy to read columns, as well as couples tools together. Want to quickly run a UNIX command? We've got that covered. Oxygen remembers the last 10 commands you've run. We have also added useful help. Oxygen is a great tool for OS X users that like Graphical User Interface, or quick access to command line utilities.