From owner-freebsd-questions@FreeBSD.ORG  Wed Aug 21 12:43:43 2013
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id 476694B4
 for <questions@freebsd.org>; Wed, 21 Aug 2013 12:43:43 +0000 (UTC)
 (envelope-from Olivier.Nicole@cs.ait.ac.th)
Received: from mail.cs.ait.ac.th (mail.cs.ait.ac.th [192.41.170.16])
 (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 28B9328AE
 for <questions@freebsd.org>; Wed, 21 Aug 2013 12:43:42 +0000 (UTC)
Received: from mail.cs.ait.ac.th (localhost [127.0.0.1])
 by mail.cs.ait.ac.th (Postfix) with ESMTP id EDD9210118B
 for <questions@freebsd.org>; Wed, 21 Aug 2013 19:36:44 +0700 (ICT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cs.ait.ac.th; h=
 content-type:content-type:mime-version:message-id:date:date
 :subject:subject:from:from:received:received:received; s=
 selector1; t=1377088604; x=1378903005; bh=W74KaH29KKHbbb3SWOsnzV
 WJprRd+Rxn761fWbFZ26A=; b=C+TyfqtAHV0S/+ww8e46+93x6UY0QxA7xYFfUK
 31zhojon3rAuD+Rtoy2NTMV9JOnnPwfUleokt0TQRrHq1cxEFPUA+9rDaRrbLPW9
 rdKfoCvOnLsnfLZ2IG1CyUas8ib6aD4VxybJF8Q9AtLeDz4WlfBeCpBWo0Xsq+63
 6Yda0=
X-Virus-Scanned: amavisd-new at cs.ait.ac.th
Received: from mail.cs.ait.ac.th ([127.0.0.1])
 by mail.cs.ait.ac.th (mail.cs.ait.ac.th [127.0.0.1]) (amavisd-new, port 10026)
 with ESMTP id jDVMMiyieGyf for <questions@freebsd.org>;
 Wed, 21 Aug 2013 19:36:44 +0700 (ICT)
Received: from banyan.cs.ait.ac.th (banyan.cs.ait.ac.th [192.41.170.5])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by mail.cs.ait.ac.th (Postfix) with ESMTPS id 951B4101185
 for <questions@freebsd.org>; Wed, 21 Aug 2013 19:36:44 +0700 (ICT)
Received: (from on@localhost)
 by banyan.cs.ait.ac.th (8.14.5/8.14.5/Submit) id r7LCaibi090431;
 Wed, 21 Aug 2013 19:36:44 +0700 (ICT)
 (envelope-from on@banyan.cs.ait.ac.th)
From: Olivier Nicole <Olivier.Nicole@cs.ait.ac.th>
To: questions@freebsd.org
Subject: Renumber users and groups
Date: Wed, 21 Aug 2013 19:36:44 +0700
Message-ID: <u9zjsb8bkz.fsf@banyan.cs.ait.ac.th>
MIME-Version: 1.0
Content-Type: text/plain
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Aug 2013 12:43:43 -0000

Hello,

On my system legacy users come with UID starting from 200 upward, and
all users come with GID lower that 100.

I know it's not a good idea, but consider that some accounts are over 20
years old!

This is not too much a problem with FreeBSD as I can renumber the few
FreeBSD services that have a conflicting ID.

But now I want to share the user directories with Mac (10.6). On Mac,
any id lower than 512 should be reserved for the system.

I tried to renumber the conflicting services on Mac OS, but it messes up
the system.

So I should renumber my users; it's not very difficult to do, but I have
over 1TB of user files for 200 users.

Is there a clever/fast way to do that (other than find -exec chown)?

What pitfall should I avoid?

Best regards,

Olivier
--