do you have your own solution? or is it something you can't solve using batch and needed help?
anyway, i felt bored now..as it's lunchtime and i have finished lunch, so i did this
import random
o = open("outputfile","a")
alltext = open("textfile").read()
beforeshuffled=list(alltext)
aftershuffled = random.shuffle(beforeshuffled)
o.write(''.join(aftershuffled))
o.close()