unable to login to console

[Mahmudur Rahman Jami <infojami@gmail.com>]

Hi,
 
I am using Debian lenny. I am unable to login to my system. It shows the following message when I put user account at desktop console CUI,
 
Usage login [-p] [name]
     -p [-h host] [-f name]
     -p -r host
 
This system is running qmail/webmail services and very important to me.
 
Please help me.
 
Rgds,
 
JAMI