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> Shebang scripts shouldn't have

Should not have or should not need to have? You can perfectly write a script with a shebang and an extension, stick it in your path, and use it without extension.

Therefore, I fail to see how this is a "dealbreaker". Or is it just because "I don't like it!"?

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So how am I supposed to put such a script in $PATH? e.g. if I hypothetically want to make a replacement for say 'ls', what am I supposed to do, force people to type 'ls.mjs' rather than 'ls'?

No, that's my point, every single shell I've ever used would resolve "ls.mjs" if you called "ls" and it's in your path...

ln is your friend

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