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  • But this doesn't close all file descriptors. Commented Dec 11, 2018 at 18:04
  • Indeed. You'll have to exec in a loop like explained in the previous replies... It was just to point the fact that "eval" is not mandatory here and that we can keep the same logic to close it than to open it... Man pages are really not clear about this... Commented Dec 11, 2018 at 18:11