David Laight writes:

>Nought about -b, so it can be used for an implementation specific option
>(of course the next version might mandate its use for something else!)

If it's used in SVR4 (and in Solaris, it is), then it's already
kind of a de-facto standard.

-- 
  Matthias Buelow;  mkb@{mukappabeta.de,informatik.uni-wuerzburg.de}