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graphical user interface
 (
GUI
) and 
windowing capabilities. However, this laptop currently has an uptime of 6 days and 
22 hours as I type this, which is roughly equivalent to 166 hours, which is not the 
same amount of time that PID 
759
 is reporting in its 
TIME
 entry. Therefore, we can 
deduce that even though my laptop has been running 6 days straight, the X server 
has only utilized 92 hours and 51 minutes of actual CPU time. In summary, the 
TIME
 
column refers to the amount of time a process needs the CPU in order to calculate 
something and is not necessarily equal to how long something has been running, or 
for how long a graphical process is showing on your screen.
Let's continue on with the 
ps
 command and look at some additional options. First, 
let's see what we get when we add the 
u
 option to our previous example, which gives 
us the following example command:
ps au
This will produce an output that will look similar to the following:
Figure 7.4: The output of the ps au command

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Controlling and Managing Processes