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

[Robin Breathe]

The following reply was made to PR bin/65649; it has been noted by GNATS.

From: Robin Breathe <robin at isometry.net>
To: freebsd-gnats-submit at FreeBSD.org
Cc: Jos Backus <jos at catnook.com>,
	Garrett Wollman <wollman at khavrinen.lcs.mit.edu>
Subject: Re: bin/65649: Add `-u name' option to env(1)
Date: Fri, 12 Nov 2004 18:16:59 +0000

 The original justification link is no longer working, however I believe 
 the patch is justified. I found this PR in advance of implementing the 
 functionality myself.
 
 Setting the other valid arguments aside, it allows a shell-independent 
 method for adjusting a utility's environment.
 
 Consider the following:
 
 sh:
 # ( unset FOO; set BAR=BIM; COMMAND )
 # ( unset FOO; env BAR=BIM COMMAND )
 
 csh:
 # ( unsetenv FOO; setenv BAR BIM; COMMAND )
 # ( unsetenv FOO; env BAR=BIM COMMAND )
 
 patch:
 # env -u FOO BAR=BIM COMMAND
 
 Regards,
 Robin Breathe