Using rdiff to check if tag exists

[Aldo TENDRON]

Hello,

I have a problem using rdiff to check it a tag exists for a given
module. 

I created 2 modules 'c' and 'd', and I want to know if these modules are
tagged with 'K2'

address@hidden:/tmp$ cvs rdiff -rK2 -rK2 c
cvs [server aborted]: no such tag K2
address@hidden:/tmp$ cvs rdiff -rK2 -rK2 d
cvs [server aborted]: no such tag K2

That's correct, I've just created them.
So now, I tag 'c' :

address@hidden:/tmp$ cvs rtag K2 c         
cvs rtag: Tagging c 

And I check again :

address@hidden:/tmp$ cvs rdiff -rK2 -rK2 d 
cvs [server aborted]: no such tag K2 
address@hidden:/tmp$ cvs rdiff -rK2 -rK2 c 
cvs server: Diffing c  

That seems correct, but now, if I check d again :

address@hidden:/tmp$ cvs rdiff -rK2 -rK2 d 
cvs server: Diffing d

'cvs rdiff -rK2 -rK2 c' appends 'K2 y' in val-tags file.

Somy question : is the 'cvs rdiff' command is accurate to find if a
module has a particular tag ? Or I've done something wrong ?

Thanks.

-- 
Aldo Tendron