Linux is a popular, open source operating system that competes with Microsoft Windows and the Apple Macintosh. There are two ways to work with a Linux system:
A graphical user interface with windows, icons, and mouse control.
A command-line interface, called the shell, for typing and running commands like the preceding
wc.
Windows and Mac OS computers can be operated by command line as
well (Windows with its cmd and
PowerShell command tools, and OS X with its Terminal application), but
most of their users can survive without typing commands. On Linux,
however, the shell is critical. If you use Linux without the shell,
you are missing out.
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