Shell Programming and Scripting

I shall give a brief explanation of the scenario - I have to send audit trail to the management, whenever a particular id logs in, and logs out. The management should be able to see what that particular id did, when the id was logged on. I have auditing enabled in my server, however, it is in the binary mode. The way, it works, is it writes the log (in binary mode), on an hourly basis. So, many log files get created on a single day. Like trail.<timestamp>. That's the format in which the logs get created.
When a particular id logs off, how do I figure out which of these log files need to be sent as an email? I need to do this using a shell script.
Can anyone please help me?

Gayathri

You should provide more information, like the Operating System and version and the command you used to enable such auditing.