>   | Prevent funny output when giving a directory name on the command line.
> 
> Is that *really* necessary?
> 
> Lots of programs don't check to see if they've been given a directory (or
> special file, or ...) when they expect an input file.   Are you planning to
> fix all of them to check and see if they happen to have been given the
> wrong file type?

Fixed cat would be good.

> There has to be some user responsibility left - if the user does something
> particularly stupid (as in "dc .." or "dc .") they ought to simply suffer
> the stupid output, or other bizarre behaviour - as long as it does no harm
> to the system, and thus one doesn't.

I think it would be better if users didn't suffer. Vesa