Checking CPU Usage and available free physical and virtual memories

Hi , can anyone please guide me on how do i go about getting the CPU Usage and available free physical and virtual memories?

i know i can get it by using prstat, but i want to get an overall CPU Usage and not a breakdown of all same for the free physical and virtual memories ?

Can you let us know as to what is the flavour of UNIX/Linux that you using.

i am solaris 9, i dun have the top command only prstat and vmstat. when i use prstat it will show all the processes and all the CPU Usage, P&V memory but not the overall.