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I've worked on several modern projects that needed to be able to run on a wide variety of Unix platforms, several of which didn't have bash. Writing for the common shell denominator was important, not archaic.

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Still sounds archaic that it's a problem today that needs to even be addressed.

I wouldn't say it's an archaic problem, an example I can think of is writing scripts for infrastructure running minimal docker images where you want to keep the image size to a minimum, you would usually need to support both bash and other shells.

Embedded applications come to mind as well.

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