bin/65649: Add `-u name' option to env(1)

[Garance A Drosehn]

Synopsis: Add `-u name' option to env(1)

Responsible-Changed-From-To: freebsd-bugs->gad
Responsible-Changed-By: gad
Responsible-Changed-When: Fri Jul 29 18:21:09 GMT 2005
Responsible-Changed-Why: 
-  Given all that I have recently done to the `env' command, this seems
like a reasonably useful option to also include.  For me, the primary
use of `env' is to alter the environment before starting some program,
*any* program, without requiring an extra invocation of /bin/sh just to
get some tiny bit of work done.  This option for -u makes sense in that
context (IMO).  I probably won't get to it in time for 6.0-release, but
I will try to do it reasonably soon.

http://www.freebsd.org/cgi/query-pr.cgi?pr=65649