I’m trying to manually verify that an old Electrum bitcoin wallet of mine contains keys that were derived from its seed as expected. One step in the key derivation requires that I hash the seed via Sha256, and then hash the result again via Sha256, and then hash that result via Sha256, etc, until there have been 100000 iterations. Ideally, I would like to do it within a bash shell, since that is really the only environment that I’m somewhat competent in, but if that isn’t possible, or if there is a superior way to do it in some other context, I’m willing to try to learn/attempt.