Programming workflow

In order to do programming excercises on your computer, play around with things you learned, and write actual, useful programs you want to learn the following workflow:

In order to switch back and forth between apps quickly you can use the keyboard shortcut cmd-tab on Mac OSX, and alt-tab on Ubuntu and Windows.

In your shell you can use the cursor up key to go through your last used commands: you don’t have to type ruby hello.rb again. Just hit cursor up and then enter to run it again.