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An operating system software user interface, whose primary purpose is to launch other programs and control their interactions; the user's command interpreter. Shell is a way to separate the internal complexity of the implementation of the command from the user. The internals can change while the user experience/interface remains the same.
اسم "باش" هو اختصار لـ "Bourne-again shell"، وهو بدوره تورية على اسم "Bourne shell"، وهو شل يونكس سابق صممه ستيفن بورن، والمفهوم المسيحي لـ "الولادة من جديد".






























