where to find logs for getting info who login

[jason zeng]

Hello, 

I am not familiar with  RedHat Linux logs, and I am encountering a problem that our important files disappeared. So I want to know WHO made this?  How can I get info about who login and when, Could I find a way to recover the files? it is possible?


Many thanks in advanced.


Regards,

Jason Zeng

 		
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