Cant add user?

Well, when I try to do useradd -, -G users,audio 11 I get the error invalid user name '11'.
I want to add all the users under there client number.
So I want to give them Numbers, why cant I?
Is there a way to do that? (I know the old way to add users self editing the Shadow+Passwd file but I am scared of breaking this system)

Cheers.
Robin

Code:

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# useradd '11'

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heh no this aint that easy.
I cant do that.
Ill get the same error.
Its what I tryed first. After that I did look at the Gentoo helpfile.
They gave me: "useradd -, -G users,audio,wheel <UserName>"
So, 11 doesnt work..

Cheers,
Robin

Whats the -, for ?

Not seen that before. I tried adding '11' on a FC7 box worked no problem.

I'll try it on a RHEL4 box in a mo.

Ok,

It works on RHEL4 as well, even without the quotes.

-, just returns invalid option...

Heh well I cant do "useradd 11" in Gentoo Ill get invalid UserName..
So, how can I change that..?
I think I should be able to add a user called 11..

ps.
the first .- is a typo for useradd -m -G users,audio,wheel username

Hmm, could be a pam setting ?

Ok, how to check?
I know waht PAM is, but I dont know how to Configure it or Check it..

Just been looking not found anything yet though.

You might want to have a dig through /etc/libuser.conf

Will do next monday.
Since this is at a pc at work.

Thanks, Cheers :)