It would be more didactically useful to not use a lower-uppercase font for the resulting options, right now it causes a lot of confusion: should you use `-I eth

It would be more didactically useful to not use a lower-uppercase font for the resulting options, right now it causes a lot of confusion: should you use `-I eth0` or `-i eth0`? (I had to look it up, the lower case variant is the correct one.)