Grep review for the morning:
	Words with at least three vowels
	Examples including a variable of type int
	Checking to see if the NVIDIA video driver is used
	isolating the MAC address
	Check to see which computers in MLH 310 are running Linux

more on shell variables and expansion:
	Setting with export
	$ to use later
		This will expand the variable name
		Demo with parameter printing program
		"expand" here can make it bigger or smaller
	A few that might be good to know:
		PS1 (yesterday)
		PATH
		DISPLAY
	run export with no paramters to list them all

alias:
	It lets you have a different name for a command
	Good for tricks
	Overview of what I use alias for in .profile
		Continuation from last time

functions:
	These take parameters, and can call each other
	Using a function vs. a script:
		script can be run as a program
		script can be moved around easily
		script runs as a child of the shell
			Try cd inside it, or setting a shell variable
	A lot of the time, you have a choice here

What happens if you make a bad mistake?
	You can install a new .profile in some non-shell-using way
	This can be harder than it looks!
	Like yesterday...

How do they look on the inside?
	getenv function
	
C interlude:
	C strings vs. C++ strings
	Arrays of characters vs. an object
	Have you used C++ strings much?
		They've got methods people like
		NOT like C strings
		There are library functions to do that stuff with C strings
	Couple important ones:
		strcmp
		strlen
		strcpy / strncpy (and security)
		strstr
		sprintf
	Ok, couple examples
		Figure out if the string has a squirrel in it
		Count the letters (not characters) in a string
	system function

Directories for binaries:
	Since we know how to write program, and adjust PATH
	Usually called either bin or .bin
		.bin is omitted from regular ls results ("hidden")
		
Python getenv:
	Easy to use, as usual