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E.g. you might pass '--random-device=/dev/urandom'. Mostly because I got sick of waiting for /dev/random to finish blocking while I was trying to generate throwaway keys for testing bug fixes in cmdgen itself. But it might also be useful on systems that call their random device by a different name that we haven't encountered. (Since cmdgen also reads the saved PuTTY random seed file, setting this option to /dev/zero will not render key generation deterministic. It's tempting to provide _some_ way to do that, for testing purposes and clearly marked as dangerous of course, but I think it would take more faff than this.)