changing primary group to secondary

From: Alexander Piavka (piavka@cs.bgu.ac.il)
Date: 12/08/02 

From: Alexander Piavka <piavka@cs.bgu.ac.il>
Date: Sun, 8 Dec 2002 12:04:09 +0200

Do you know a command which lets a user change its primary group to
some other group in its secondary groups list for the current session?
I found out that chgrp let me change the group of files I own, I want to
see if I can do something similar to processes.

 Thanks.

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