Hmmm... <goes and looks> heh :\ I see what you mean.
Bots don't normally respond to replies though do they? With such a lot (and about one per day) all around the same somewhat narrow subject (sorting files, or through files, in bash) I could suspect homework here.
These are homework questions.
Was previously told that homework help is easier to get if he shows us what he's tried, since then, he's been posting some random code as well.