Showing password asterisks as feedback in sudo

A friend showed me a very useful feature he had enabled in sudo, which let him see a masked (with asterisks) view of the typed characters in the password prompt. Here's how to enable it!

Open your terminal and edit your sudoers file with visudo:

sudo visudo

Side note!

It might be useful to set the EDITOR env var to something else to avoid the pain that is vim.

For example:

copy

EDITOR=micro sudo visudo

Modify the following line

Defaults env_reset

with

Defaults env_reset,pwfeedback