    # File lib/chef/knife/cookbook_delete.rb, line 62
          def delete_all_without_confirmation
            # look up the available versions again just in case the user
            # got to the list of versions to delete and selected 'all'
            # and also a specific version
            @available_versions = nil
            Array(available_versions).each do |version|
              delete_version_without_confirmation(version)
            end
          end