I really want to do this with the two accounts I have at different banks. Neither makes it easy to automatically download my transactions. What I want is to run a command to run to download the latest transactions and output some simple ledger-like[1] output.

When I have tried to do double entry account before it was tricky to keep up. I would spent a lot of time trying to figure out what I had already reconciled and what I had not.

1: http://www.ledger-cli.org/