I would like a command line API tool that allows one to download the contents of an entire collection or of a specific shared list to a location of my choice on the client side computer I'm using to run it. It can be extremely simple. E.g. upon starting

Would you like to download a 1) collection or 2) shared list?
[user enters 1 or 2]

If Collection, display list of available collections with numbers next to each one.
[User enters the number of the collection they want to download]

If Shared List, ask for the name of the shared list
[user would have to copy/paste in the name or just type it out]

After download begins it would be important to show some kind of status bar since presumably the download will take a while.