Hello,

We have many servers such as Web server, Mail Server, Proxy 
server etc all running in Linux system. When a user logs on into 
our server, then i need that another person using the same 
username and password should not be allowed to log on into the 
system. How can I do this?

It will be better if the same user has already logged on then display 
the WARNING message telling another person using the same 
username has logged on. 

I need help.

Regards,
Thakur Gyawali

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