Re: Users, groups and directory access

From: A.J. Bonnema (abonnema_at_xs4all.nl)
Date: 05/05/04

  • Next message: Davide Dolcini: "Laptop Battery" 
    Date: Wed, 05 May 2004 15:48:57 +0200
To: For users of Fedora Core releases <fedora-list@redhat.com>

    Matthew Miller wrote:
    > On Wed, May 05, 2004 at 03:30:07AM -0500, David L Norris wrote:
    >
    >># root can change john's group membership like this
    >>usermod -G proj john
    >
    >
    > This is bad because it *replaces* the current list of groups. If john was
    > previously a member of 'staff' or 'proj2', that would be removed. This is
    > why gpasswd -a is usually better.
    >
    >

    Thanks for allerting me to this detail!

    Yes, well I can confirm, although it doesn't work as I expected after
    reading the man-page.

    The primary group is never deleted (the man-page only mentions that
    groups not listed will be deleted, which appears not to be true for the
    primary group.

    If you add the primary group using 'usermod -G' then all secondary
    groups are deleted from this user.
    If you add a secondary group, that is new to this user, the old
    secondary groups are all deleted (from this user). The primary group
    remains in effect.

    Guus. 

    -- 
A.J. Bonnema, Leiden The Netherlands,
user #328198 (Linux Counter http://counter.li.org)
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