How to skip downloading files that already exist with dx download?

dx download has an option (-f) where you can enforce that pre-existing files should be overwritten by the remote file. But what if we don't want that - instead, we want to skip pre-existing files? It seems that the only option aside from overwriting is to error out. This seems like a flaw in dx download, unless I'm misinterpreting the manual page.   https://documentation.dnanexus.com/user/objects/uploading-and-downloading-files/small-sets-of-files/downloading-using-dx

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