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The name "shell" for a command line interpreter and the concept of making the shell a user program outside of the operating system kernel were introduced in Unix's precursor Multics.
Almquist shell, a command-line interpreter used by the Unix computer operating system
Command Prompt, or cmd.exe, the command line interpreter in Windows and OS/2 operating systems
The Bourne shell, sh, was written by Stephen Bourne at AT&T as the original Unix command line interpreter; it introduced the basic features common to all the Unix shells, including piping, here documents, command substitution, variables, control structures for condition-testing and looping and filename wildcarding.