Not too sure how to describe this... but I saw this on a person's computer a cafe today and didn't get a chance to ask him what plugin/application he was using --
I think it best to illustrate with an example:
Say there's a directory with three folders, 'kitty', 'doggie', and 'frog'.
cd f would make the letters
rog appear after the 'f', but
rog would be in a lighter color of text (a greyed color) -- it was a sort of "visible autocomplete", not sure what else to call it. Anyone know how to achieve this? Thanks.