How about clicking?
Considering that you really need only the following:
$ shred -u private.txt
And that everything else is for the purpose of illustrating the example. Do you really find that a lot of typing?
Oh, and by the way, no matter how many time you click a file under windows, you won't shred it without 3rd party software. So unless you know something I don't, typing is better than nothing.
Lastly, before anyone calls me a zealot, I use bot windows and linux, thank you.