Limiting logins

[Rus Foster <rghf@fsck.me.uk>]

Hi All,
I'm just trying to work out how do I limit logins so that an accounts can
only have one login at a time? I had a look at /etc/security/limits.conf
and
accidently set maxlogin to 1 thinking it worked on a per users basis as it
actually seems to be on a system basis

Short of putting all the users in /etc/security/limits.conf is there a way
I can set the logins?

Rgds

Rus

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