"That command is pretty long, and typing it out would probably
get on my nerves. You can use an alias to effectively shorten it.
Here's how we'll do that, also at the command line...
"Let's say we want to be able to type in lock, to lock the
screen. If I just type in lock, I get nothing. So I need to create
an alias for this command. An alias is just like what it sounds
like. It's assigning another name to a certain command. At the
command line enter..."