The keyhole into Mac OS X’s Unix innards is a program called Terminal, which sits in your Applications→Utilities folder (see Figure 16-2). Terminal is named after the terminals (computers that consist of only a monitor and keyboard) that used to tap into the mainframe computers at universities and corporations. In the same way, Terminal is just a window that passes along messages to and from the Mac’s brain.

The first time you open Terminal, you’ll notice that there’s not much in its window except the date, time and source of your last login, and the command line prompt (Figure 16-2).

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