Grammar of a command:
	Spaces are separators
	First, name of the program or command to be run
		ls, man, cd, etc.
		Most of these are programs
		Some, like cd, are shell builtins
	Then, arguments (also called parameters)
	General note on structure:
		commmand/program SPACE argument1 SPACE argument2 ...
	flags:  A special argument starting with -
		Settings for that run of the program
		Generally not persistent
	Commands for you to try: who, w, top, ps
	Commands can be chained together with pipes
		Later...

C note, with argc and argv
	How?  Text editor, then compiler (which also links)
	Default name is a.out
		You could specify a different name
		Or use mv later

Couple quick notes for being fast:
	tab auto completes names
	up arrow retrieves previous commands
	cd - changes to the previous directory
	ctrl+r does a search for previous commands

Passwords on *nix, /etc/passwd
	why I can't find out your password
	john the ripper

Permissions and chmod

BASH and shells
	shell, terminal, these names
	Brief flowchart for a shell
	What if we just run "cat" and press enter?

Let's learn a command:  who
	Also w and last and finger (which doesn't work right anymore)

Time for a walk:  Some computers with names
	Name is often in the prompt
	uname -n
	Separate the computer in front of you from the one you are using
	Since you'll probably ask:  X11 forwarding over SSH
	Remote desktop is another way to do this

Interlude:  Why don't I have to type a password all the time?
	Cryptographic authentication (is stronger, depending)

Let's talk about networks!
	Enough for the moment, anyway
	Internet Protocol
	Addressing with IP
	Ports
	Standard ports

A bit more about how things work
	protocols
	DHCP, briefly, and the MAC address
	DNS, and 8.8.8.8

Ruining the magic kingdom:  Firewalls and NAT
	Some connections can only be initiated from one end
	Port forwarding (for NAT)
	A relay point on the outside
		- ssh can do this
	
We talked about the file tree a bit yesterday
	But now a tour!
	Slash direction is opposite DOS/Windows
	Case matters!
	/tmp
	/etc
	/home
	/dev and /proc
	/root (and who is root?)
	/bin, /usr, /opt, /sbin, /sys, /lib, /lib64
	/var and /var/log
	/usr/share/doc

Special characters in filenames:
	Spaces 
	/
	- (not special)
	. (not special)
		Linux does not require file extensions
		They are commonly omitted on regular text files
	~ (your home directory, if it is first)
	cd with no parameters

Let's learn another command:  grep
	grep and files

Finally:  pipes (combining grep and who)