GUI

• Access your hard drive from "My Computer," or the equivalent for your operating system. Ubuntu uses the folder "Computer" from "Places," and Mac OS X will show your mounted hard drives that show up on you desktop. "Double-click" your main hard drive to access your files and folders.
  
  

Command Line

• Command line is more commonly used on Linux machines, though it can also be accessed on Windows and Mac computers. By entering certain commands, you can navigate your file system. The "ls" command lists files and folders in the root directory, and "cd DIRECTORY" switches the folder. See Resources for a list of basic Unix commands.
  
  

Hidden Files

• Certain system or program files may be hidden. In Windows, go to "Control Panel," "Appearance and Personalization" and "Folder Options" to make hidden files visible. In Ubuntu, you can press "Ctrl+H" on your keyboard in the file manager. In OS X, you can select the option to search for invisible files from the "Find" menu.