cp foo{,.bak} not always supported

[Bruce Dubbs]

Bryan Kadzban wrote:

> I strongly suspect the user was running either sh (which was not linked
> to bash) or dash.  I left that in there just in case they were running
> it, but someone decided to "set +B" in one of the startup files.  No, I
> don't know why anyone would want to do this, but it is one possible
> explanation for the failure.  :-)

My point is that this is an unusual user problem and it is not appropriate for 
the book to address it.

   -- Bruce