EDIT I thought of a better way to phrase the question.
How can I find the alias that Ubuntu is using for a different text editor? Rather than using nano by typing
nano file.txt, i'd like to be able to type
sublime file.txt to open sublime editor. I don't know where to look to find these aliases.
sudo update-alternatives --config editor does not show it as a choice, I only see the 'default' editors, like Nano and vim.tiny.