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If I were to write a makefile for something where I can't restrict the filenames beforehand I'd probably just have a target for running `detox` and then at the very end possibly an another target that changes underscores to spaces and creates some dummy file as the real target.

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But how does this address anything like the zip or grep cases I mentioned? File names go everywhere. You will have spurious nonbreaking spaces (or underscores, or whatever else) in outputs from here to /dev/null and back. Yes, it is theoretically possible to work around it, but it's hardly ergonomic for either the writer or the user of the Makefile.

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