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==Life cycle==
Shell scripts often serve as an initial stage in software development, and are often subject to conversion later to a different underlying implementation, most commonly being converted to [[Perl]], [[Python (programming language)|Python]], or [[C (programming language)|C]]. The [[interpreter directive]] allows the implementation detail to be fully hidden inside the script, rather than being exposed as a filename extension, and provides for seamless reimplementation in different languages with no impact on end users.
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==Advantages and disadvantages==