7.3. Monitoring Users

Just because you're paranoid doesn't mean they AREN'T out to get you... Source Unknown

From time to time there are going to be occasions where you will want to know exactly what people are doing on your system. Maybe you notice that a lot of RAM is being used, or a lot of CPU activity. You are going to want to see who is on the system, what they are running, and what kind of resources they are using.