I think I'm going to toss a shell scripting sidebar into the story too. Aside from the | && >> and ; that I should tell folks about?
& < >, why ./ is important, and, of course, tab completion. I wouldn't spend a whole lot of time on how to write shell scripts (yet). Probably just explain that there are multiple shells available and discuss some of the adv/dis for each. You can always point them to the root document, which has some good shell script examples. Probably discuss how all devices are files and do something like 'ls | grep something_here | sort > /dev/lp0'.