Lost logins

I currently have a satellite server within my offline environment, and i have recently taken over this network. Over the past couple of years there have been multiple administrators to this system. However prior to my predecessor the password has since been lost.

Is there a way i can live boot to change a satellite servers root password?

or

Is there a specific way to boot into a commandline interface?

At this point in time i dont know whether i am on Satellite 6 or 7.
Any information would be very grateful at the moment, as i am lost at this point.