How do I find out if somebody logs into my computer

I need to see log in attempts on my iMac. Is there a way to find out when, and which user logs in and for how long. I know I can buy software. But is there an application in the system that can do this?

Go to Applications / Utility's / Console and look for secure.log on the left side of choices.
All your crash reports will be here also.

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