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There are over a hundred shell scripts in my /usr/bin/ dir that don't end in '.sh'. There are even Python scripts in there that don't end in '.py'. The world hasn't gone mad?

Ending the filename of a shell script in '.sh', while a useful and common convention, is unnecessary (I appreciate you that you acknowledge that) so using that to identify shell scripts is a heuristic, just like what file does.

Look, I don't want to argue about this. cat199 was catching downvotes for pointing out, quite correctly, that the '.sh' extension was just a convention, and, well... https://www.xkcd.com/386/

Filename extensions have always been a crappy hack to get around the omission of useful metadata associated with a file on some early filesystems. Gnome file viewer thing doesn't even sort by them!

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