Grep review for the morning:
	Examples including a variable of type int
	Checking to see if the NVIDIA video driver is used
	Check to see which computers in MLH 310 are running Linux

Shell Variables:
	A variable you can use in a shell
	Example:  DISPLAY
		Log into another machine and try it
	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 couple more that might be good to know:
		PS1
		PATH
	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