I was wrong about Yankee Clipper, because it does have a history option, where it retains data after a reboot. Don't know why, but when I had tried in the past, it didn't work, but it did on the test reboot I just did. It would be nice if I could install it on the flash drive, instead of on the system itself, but even if that could be done, I don't know if it could be used in Linux. It's something to play with.