> 'env - ...' isn't even documented!

man env # under NetBSD/i386 1.5.3_RC2

     The historic - option has been deprecated but is still supported in this
     implementation.

I see it doesn't say what it does (to start with an empty environment).

For your information, the GNU env (from GNU sh-utils 2.0) says: "A mere -
implies -i."

   Jeremy C. Reed
   http://bsd.reedmedia.net/