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    Brace expansion isn't performed within single or double quotes Commented Jun 6, 2019 at 6:47
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    @SergiyKolodyazhnyy The point of the question is that the ? is also quoted, and gets expanded after $(...) substitutes it, but the brace expansion doesn't. Commented Jun 6, 2019 at 6:48
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    @muru No, that's not the same issue. Here the order of expansions doesn't matter, what matters is which expansion takes place in which context. I wouldn't be surprised if this question was a duplicate, but I couldn't find it. Commented Jun 6, 2019 at 7:00
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    @mosvy Ksh and bash do expansions in the same order, but ksh does brace expansion in a case where bash doesn't do it at all. Zsh-with-globsubst does the same expansions as bash, but in a different order. Commented Jun 6, 2019 at 20:59
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    @Gilles no they don't. As documented and easily demonstrated, ksh (and zsh) will perform the brace expansion just before globbing. zsh-with-globsubst won't perform any brace expansion at all on the results of $-expansions: zsh -o globsubst -c 'a=/e*; b={/b*,/v*}; echo $a; echo $b'. Commented Jun 6, 2019 at 22:14