vi may be guaranteed to be there, it being standardized alongside ex in the Single Unix Specification. vim does not have such guarantees. Nor do you have guar

vi may be guaranteed to be there, it being standardized alongside ex in the Single Unix Specification. vim does not have such guarantees. Nor do you have guarantees that vi is even the same program as vim. It can be nvi or even actual Joy vi on some systems. Which is why a work colleague of mine for years maintained the habit of using vim with the arrow keys unmapped, so that the kinaesthetic memory would work if xe hit a system such as that. * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/vi.html http://pubs.opengroup.org/onlinepubs/9699919799/utilities/vi...