join problem last time

Regular expressions, again:
	It helps to practice with these regularly
	Especially now that we're starting with sed

Some practice problems for us:
	Words with at least 3 a's that don't have an s at the end
	Words that are two or three letters and have an r
	Words with three vowels in a row

diff
	It can output in a variety of ways

aspell

Scripting basics:
	Sometimes it's too complicated to do something in a single line
	Sometimes it's nice to have a command saved somewhere

Arguments:
	$1, $2, $3, etc.
	$?

Conditionals:
	if <something that returns 0 or not 0>
	then
	
	else
	
	fi
	Usefully, grep returns 0 if it found what you were looking for
	So you can do something like this:
	if grep -i bird $1
	then
		echo $1 contains a mention of birds
	fi

While loop:
	It's like an "if", but you can't have an else, and it repeats
	Same as most programming languages

for loop:
	for item in list
	do
		whatever you want with $item
	done

semicolon is a valid "next line" at the command line
	In case you want it all on a line
	BASH will let you keep adding lines anyway if you're not done

BASH is a pretty decent programming language
	Tends to be compact
	Has conditions, functions, loops, etc.