> > Oh, please, use /bin/ed for such purposes, not vi (or emacs, or ...)
> 
> How about /usr/bin/ex?  Is it there only for the case that one can use
> no screen???

Later I have had found that /usr/bin/ex behaves exactly the samy way
as /bin/ed does, that is, it reads commands from standard input and of
course can be used non-interactively.

(I guess that such a fact should be taught at elementary schools in
 California. :-)

Regards,
Masao