We're about 6 chapters into the book now

Review:  A couple challenges:
	How many lines of the poem in /tmp are not blank?
	Which line has the least spaces?
	Can we find the MAC address for each of isoptera's 4 cards?
		- Will the solution work on FreeBSD?

Example:  An automatic lawn mower
        - Commands are pieces you can combine in many ways
        - Experiment and use creativity!

Text editors, a bit more detail
	You've probably figured out how to use nano
		- It's the successor to pico, "PIne COmposer"
		- Pico had "unclear licensing"
		- Nano does the same thing, but is a different program
	nano is easy to use, but isn't generally a favorite
		- Not as featured as others
	vim:  VI Improved
		- Has a great many features
		- Very focused on editing code and such
		- Separation of insert and command mode
		- Example:  Cut and paste
		- Example:  Intent a block
	emacs:  A bunch of macros, e editor
		- Very full-featured

Paths, cd, pushd, and popd
	-
	~
	cd with nothing else
	.. and .
	/ and ////////////////
	hidden files

Some more things the shell will process
	$(( math problem ))
	{ and } (for multiple possibilities)
		- 0 padding is ok
		- Works for letters too
		- Make a bunch of directories this way
	$( command ) does the same thing as `command`
	' and ' (single quotes) are like " " but stronger
	Reminder:  \ is escape
		- How do we echo a \ 

Now that we're more advanced, let's solve a few problems:
	How many HTML tags are in the homework 3 description?
		- How many are closed? 

sort and uniq
	How many different users logged into isoptera?
	
Redirection:
	< > 2> etc
	Use a file as an end of a pipe
	Example:  A streaming media server
	Both at once?  tee