Can you order these lines so they set API_KEY to 123, change it to 987, display it, and append it to the .bash_profile file?

Ace! We use export to set and change the API_KEY, echo to display it and echo with >> to append it to the end of the profile file.

Not quite! We use export to set and change the API_KEY, echo to display it and echo with >> to append it to the end of the profile file.