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The shell is both a command language and a programming language that provides an interface to the UNIX operating system (Bourne, 1978).

The shell is the part of the operating system that the user interacts with, and is arguably the most important part of the operating system. Files can be created, renamed, moved and read from the shell. Computer hardware can be installed, used and removed through the shells. Program applications and scripting can be written, compiled, and ran through the shell.

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