Quoting Didier Kryn (kryn@???):
> However, in general, in situations where vision is the most use
> sense, colour is the prefered method to draw attention, not only on
> computers. It is very apropriate on the command line because it does
> not change the syntax of what is written, exactly like syntax
> highlighting in editors. Actually it is even possible to change the
> color of the command itself, but it also changes the colour of the
> output.
Didier, thank you for a thoughtful and constructive answer to my
rather frivolous question. You're of course quite right.