Process memory usage

[samag70-ignore at yahoo.ca]

How can I see how much memory a particular process is using?  
  
  What about which processes are consuming the most memory on the  system?  Which processes are consuming the most CPU on the  system?  
  
  (ps -aux isn't bad, but I'd prefer to get actual values back rather than %used.)
  
  Sam
  
  

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