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\marginnote{While modern graphical \glspl{desktop environment} have generally replaced early command-line interfaces, the command line can still be a quick and efficient way of performing many tasks. See \chaplink{ch:advanced-topics} for more information, and \chaplink{ch:the-ubuntu-desktop} to learn more about \gls{GNOME} and other desktop environments.} Linux was designed from the ground up with security and hardware compatibility in mind, and is currently one of the most popular \Index{Unix}-based operating systems. One of the benefits of Linux is that it is incredibly flexible and can be configured to run on almost any device\dash from the smallest micro-computers and cellphones to larger super-computers. \Index{Unix} was entirely command line-based until graphical user interfaces (\glspl{GUI}) began to emerge in the early 1990s.