Pipelines, and pipeline model of processing
	Let's add a tool to the pipeline!
	Using Python this time

Processes:
	A program that is running
	Can have more than one copy running at once

ps:
	Display processes
	ps axu displays all of them, BSD style
		- Can use grep after that

top:
	Interactive display
	Quick answer to "why is my computer so busy?"
	More than 100% useage from one process

bg / fg:
	Background and foreground
	ctrl+z:  Stop a process
	Foreground process receives keyboard input
	Background process doesn't

kill, killall:  Send signals
	By PID or by name
	-9:  Kill for sure
	Why not die with ctrl+c always?

signals, sigaction, and making a program resist ctrl+c
	Function pointers...hope this makes sense!
	Function pointers in Python (just to be complete)
	
xkill:
	For when you can't be bothered to look up the PID or name

pstree:
	Might look really bad on the projector

Ok, let's see about ps axu:
	Find all processes that have to do with the web browser
		- We'd need killall for it
	What's been running since January? (isoptera)
	How many people are running bash? (isoptera)

Killing things:
	Let's kill some processes that will probably cause problems

CPU usage:  What if we decide to use more than once CPU?
	pthreads

If we have time:
	.profile and .bashrc, intro to shell variables
	Python program to report user process counts