Know field type usage I need to know if a field type is used on a website in a content type. How can I know that with Drush or Drupal BO?
This should give you a list of the fields and types on your site.

drush field-info fields


Should output something like this

 Field name               Field type            Field bundle 
 body                     text_with_summary     page,article          
 field_image              image                 article          
 field_category           entityreference       article          
 field_name               text                  article