Changing value of uname -r

[Fbsd8]

Robert Bonomi wrote:
>> From owner-freebsd-questions at freebsd.org  Tue Jan  1 11:52:49 2013
>> Date: Tue, 01 Jan 2013 12:49:17 -0500
>> From: Fbsd8 <fbsd8 at a1poweruser.com>
>> To: FreeBSD Questions <freebsd-questions at freebsd.org>
>> Subject: Changing value of uname -r
>>
>> uname -r   returns 10.0-CURRENT
>>
>> setenv UNAME_r "9.0-RELEASE"
>>
>> uname -r   now returns 9.0-RELEASE
>>
>> How to reset uname -r to original value without doing
>> setenv UNAME_r "10.0-CURRENT"?
>>
>> Is there some way just to deactivate the effect of the
>> setenv UNAME_r so it returns to the real value of the system?
> 
> Did you try:
>   unsetenv UNAME_r
> 
> If yes, what were the results?
> 
> If no, _why_not_?
> 
> 
   yes unsetenv UNAME_r worked.