It seems that the latest posix/ieee/opengroup spec has the newgrp
utility as optional. see:

http://www.opengroup.org/onlinepubs/007904975/utilities/newgrp.html
(the [UP] indicates it is optional).

Of course the shell is required to invoke it - even if unimplemented:
www.opengroup.org/onlinepubs/007904975/utilities/xcu_chap02.html#tag_02_09_01_01

I had been wondering whether letting setregid() succeed for groups in
the processes group list would let a non-suid newgrp be wtitten.

Anyway looks like bin/11047 can be closed.

	David

-- 
David Laight: david@l8s.co.uk