What is Shell?
A shell is a command line interface, or you can say a program that takes commands from the user and instructs the operating system to perform tasks on the basis of these commands. There are many shells used in different operating systems like Bourne shell, C shell, Bourne Again shell. All have a different set of features and command behavior. Most of the Linux distributions have Bourne Again shell also known as bash as their default command line.
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