URGENT: How do I see users ssh?

I am currently facing some problems with high loads on the server. Logging in with ssh 'uptime' shows 4 users. I'm confused about that - does this mean that 3 other users than I are logged in via ssh? I would like to see who these users are. Does anybody her know a command that can show me that?

Thanks
John

 

 

 

 

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