On Wed, 04 Dec 2013 09:16:46 -0600 "David C. Rankin" <drankinatty@xxxxxxxxxxxxxxxxxx> wrote: > All, > > In the past with arch installs, new users have always been added to the > 'users' group. Now that is not being done. If I recall correctly, I have > always specified that users are members of a group with the same name as the > user by manually creating the group and using the useradd -g <group> option. > This was done to keep UID and GID numbers the same across multiple boxes. On > older installs all users were made part of the users group: > > (July 2011 install) > > [08:31 nirvana:/etc/httpd/conf] # grep users /etc/group > users:x:100:david,anna,blah,blah,blah > > (New install) > > [08:45 phoinix:/etc] # grep users /etc/group > users:x:100: > > Is this expected behavior, or has something gone wrong with the install? I > ask because https://wiki.archlinux.org/index.php/Cron#Users_and_autostart > suggest that all users should already be members of the 'users' group. I > don't mind manually adding the users, but if this is a bug, I'll report it. > > In short, this is OK; your user doesn't need to be mentioned in /etc/groups after his primary group. If he is mentioned, then the primary group is also his supplementary one (which is anyway automatic). GID=100 (users) is a primary group, see /etc/defaults/useradd. The primary group info is stored in /etc/passwd (userid:x:UID:primary_GID:...), so the "users:x:100:"entry in /etc/group is dummy and AFAIU exists only to make useradd happy. This is done to save space in /etc/group on systems with large number of users. My speculation would be that in 2011, you ran "useradd -m -g users -G users,audio,... david". The correct call shouldn't contain "users" after -G. Cheers, -- Leonid Isaev GnuPG key: 0x164B5A6D Fingerprint: C0DF 20D0 C075 C3F1 E1BE 775A A7AE F6CB 164B 5A6D
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