Well, bash offers vi and Emacs as editing modes. We're already covered on that front. Many of the parameters for ls are cryptic, making it awkward to use for anything other than routine tasks without referencing the man page. more is so limited that many people choose to use a program used to concatenation files (cat) as a file viewer. Those who don't want to reach for their mouse to use their terminal's scrollbar buffer will use less, since it does more than more. Don't bother parsing that last sentence with bison, unless you have a yacc to shave.