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This was a long discussion for something that ends up being simple (TTY or pseudo-
TTY), but with this knowledge you should be able to differentiate between a process 
running on the actual server or through a shell.
Continuing, let's take a look at the 
TIME
 field of our 
ps
 command output. This field 
represents the total amount of time the CPU has been utilized for that particular 
process. However, the time is 
0:00
 for each of the processes in the screenshot I've 
provided. This may be confusing at first. In my case, the 
vim
 processes in particular 
have been running for about 15 minutes or so since I took the screenshot, and they 
still show 
0:00
 utilization time even now. Actually, this isn't the amount of time 
the process has been running, but rather the amount of time the process has been 
actively engaging with the CPU. In the case of 
vim
, each of these processes is just a 
buffer with a file open. For the sake of comparison, the Linux machine I'm writing 
this chapter on has a process ID of 
759
 with a time of 
92:51
. PID 
759
 belongs to my 
X server, which provides the foundation for my