Ever needed to change something in a file, you only have a command line and the default editor is nano?
You can change this easily with one single command:
change-editor
OR
update-alternatives --config editor
This will call up an interactive input that lets you change the editor to what you want in about 5 seconds.
If you have only one editor installed, you will not receive the menu when executing update-alternatives. Instead you will get a message like the following:
There is only one alternative in link group editor (providing /usr/bin/editor): /usr/bin/vim.tiny
Nothing to configure.