Standardize CLI examples

[pop]

As the style guide says we should be using $ to denote commands and (hopefully) show some example output. I usually try to avoid nit-picking with the style guide, but this really helps other users (and me) understand:

• Is this a command I'm supposed to be typing?
• What should happen when this is run?

Written context can also accomplish this, but adding a prompt and some output reduces confusion greatly. We should retroactively fix discrepancies with this and be better slickers about standardizing this going forward.