How can I update a field on a user profile with Drush I'm creating users with user-create but I have added extra fields to the user like membership number.

Is there a way to update that field with a number when I create the user?
Take a look at Drush Entity. Here is a quote from its project page:


  ... you can query the entity system available for Drupal 8, 7 and (some of) 6.