> but i have small doubt what is the difference between
>
> $ adduser postgres
> and
> $ su - -c "useradd postgres"
The first ought to fail because a non-superuser should not have the
ability to add new users to the system. (The $ prompt indicates that you
are not a superuser.) If it worked, your system would be completely
insecure.
The second becomes superuser before trying to add the new user.
Perhaps you need to do a basic Unix course...
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C
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"Behold, happy is the man whom God correcteth.
Therefore despise thou not the chastening of the
Almighty." Job 5:17