To add a permission to a specific role, we need to know what the permission is called, the name of the role, and the drush role-add-perm command. Sometimes, knowing what permission is called may be tricky. In those cases, we can always use the Drupal Admin UI to navigate to the Permissions page to get a better idea of what a permission may be called.

For example, if we want to allow the developer role to administer comment types and settings, that would equate it to 'administer comment types'. Knowing this information, we can open a terminal window and enter the following command:

    drush role-add-perm developer 'administer comment types'
  

To verify that our developer role has the new permission we just assigned, we can use the drush role-list developer command again to view the assigned permissions: