Re: default group ownership of a file

[Mike McCarty <Mike.McCarty@sbcglobal.net>]

Michael Schurter wrote:
> ChadDavis wrote:
>
> > Hello.  I need to know how the group ownership of a file is decided in 
> > debian.  Also, is it the same for all linux systems? 
>
>
> All Linux (and probably Unix) filesystems store a group ID number (gid) 
> on a per-file basis.  The gid is looked up in /etc/group to get the 
> textual group name you're used to seeing.
>
> All users have a primary group membership as well as any number of 
> secondary group memberships.  (use the /usr/bin/id command to get that 
> info)  When a user creates a file, that file's group owner is set to the 
> users primary group.

This is also affected by the newgrp command, I believe.

> You can change the group ownership of a file with the /usr/bin/chown or 
> /usr/bin/chgrp commands.  You can change the group membership of a user 
> with the /usr/sbin/usermod command.
>
> Michael Schurter


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