In my earlier question, I got a response recommending the "newgrp" command. It diligently did the job of putting my desired group at the "top of the list" for the "id" command, but, why does it also complain about "too many groups"? What is the limit, and, where is the documentation about that?
Yes in Macosx ngroups is 16
Run "sysctl kern.ngroups"
And btw it cannot be changed with "sysctl -w "