adduser to group

[Patrick Dupre]

Hello,

I want to add the user pdupre to the group vboxusers
groups vboxusers
groups: ‘vboxusers’: no such user

but
useradd -m pdupre -G vboxusers

useradd: user 'pdupre' already exists

===========================================================================
 Patrick DUPRÉ                                 | | email: [e-mail]
 Laboratoire interdisciplinaire Carnot de Bourgogne
 9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE
 Tel: [phone]
===========================================================================

[Patrick Dupre]

Sorry for the disturbance:
usermod -a -G vboxusers pdupre
works fine
> Sent: Monday, July 20, 2020 at 11:09 PM
> From: "Patrick Dupre" 
> To: "fedora" 
> Subject: adduser to group
>
> Hello,
>
> I want to add the user pdupre to the group vboxusers
> groups vboxusers
> groups: ‘vboxusers’: no such user
>
> but
> useradd -m pdupre -G vboxusers
>
> useradd: user 'pdupre' already exists
>
> ===========================================================================
>  Patrick DUPRÉ                                 | | email: [e-mail]
>  Laboratoire interdisciplinaire Carnot de Bourgogne
>  9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE
>  Tel: [phone]
> ===========================================================================
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[Matthew Miller]

On Mon, Jul 20, 2020 at 11:11:17PM +0200, Patrick Dupre wrote:
> Sorry for the disturbance:
> usermod -a -G vboxusers pdupre
> works fine

I have a habit of using gpasswd, instead:

gpasswd -a pdupre vboxusers

because it's easy to forget the -a to usermod. (Or, less likely now, but it
used to be that some versions of usermod didn't have that option and
silently ignored it, which is a recipe for later confusion!)

In any case, remember you have to log out and back in again for this to take
effect.

[Joe Zeff]

On 07/20/2020 03:09 PM, Patrick Dupre wrote:
> Hello,
>
> I want to add the user pdupre to the group vboxusers
> groups vboxusers
> groups: ‘vboxusers’: no such user

What else did you expect?  That command is used to list the groups a 
user is a member of.  As vboxusers isn't a user, it can't belong to any 
groups.
> but
> useradd -m pdupre -G vboxusers
>
> useradd: user 'pdupre' already exists

Again, what else did you expect?  The useradd command is used to add a 
user to the list, and as pdupre is already in the list of users, that's 
what you should have expected.  HTH, HAND.