To assign a role to a user using Drush, we simply need to know the name of the role, the user ID we want to assign the role to, and the drush user-add-role command.

For example, if we want to assign the administrator role to our developer user, we would enter the following command:

    drush user-add-role 'administrator' 2
  

We can then list the user information to verify that the role has been assigned.