From owner-freebsd-questions@FreeBSD.ORG  Thu Feb  7 18:15:14 2008
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From: Chuck Swiger <cswiger@mac.com>
To: Pietro Cerutti <gahr@gahr.ch>
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Date: Thu, 7 Feb 2008 10:15:13 -0800
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Cc: User Questions <freebsd-questions@freebsd.org>
Subject: Re: cp -p
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On Feb 7, 2008, at 10:07 AM, Pietro Cerutti wrote:
> here's the situation:
>
> HostServer exports via NFS /www, which belongs to user:www
> (uid=1001, gid=80). The directory has the segid flag set:
>
> drwsr-xr-x  13 user www 512 Feb 7 00:58 www

Umm, that directory you show has the setuid bit set, not setgid!
If you do a "chmod g+s www" you'll get "drwxr-sr-x" permissions.

-- 
-Chuck