How does one refresh the groups that a logged-in user is in without having to re-login?
marked as duplicate by slhck♦ Jan 14 at 16:56
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
possible in shell (I don't think it is for gui)
I wrote more info on this on my blog a while back. according to that this will also change the default group of the shell. you can use