![]() The standard shell is bash if you are running OS X v10.3 or later and tcsh if you are running an earlier version of the operating system. Although you can use any shell of your choice, the examples in this book assume that you are using the standard OS X shell. In addition to running individual tools, most shells provide some means of combining multiple tools into structured programs, called shell scripts (the subject of this book).ĭifferent shells feature slightly different capabilities and scripting syntax. A shell is a special command-line tool that is designed specifically to provide text-based interactive control over other command-line tools. Each Terminal window or SSH connection provides access to the input and output of a shell process. In the modern era, in spite of the ability to transmit graphical user interfaces over the Internet, the command line remains a powerful tool for performing certain types of tasks.Īs described previously in Before You Begin, most users interact with a command-line environment using the Terminal application, though you may also use a remote connection method such as secure shell (SSH). Historically, the command line interface provided a way to manipulate a computer over simple, text-based connections.
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