code: def diff(*args, **kwargs):
      '''
      Return the DIFFERENCE of the result sets returned by each matching minion
      pool
      .. versionadded:: 2014.7.0
      These pools are determined from the aggregated and sorted results of
      a salt command.
      This command displays the "diffs" as a series of 2-way differences --
      namely the difference between the FIRST displayed minion pool
      (according to sort order) and EACH SUBSEQUENT minion pool result set.
      Differences are displayed according to the Python ``difflib.unified_diff()``
      as in the case of the salt execution module ``file.get_diff``.
      This command is submitted via a salt runner using the general form::
          salt-run survey.diff [survey_sort=up/down] <target>
                       <salt-execution-module> <salt-execution-module parameters>
      Optionally accept a ``survey_sort=`` parameter. Default:
      ``survey_sort=down``
      CLI Example
      .. code-block:: bash
          salt-run survey.diff survey_sort=up "*" cp.get_file_str file:///etc/hosts
      '''
      import difflib
      bulk_ret = _get_pool_results(*args, **kwargs)
      is_first_time = True
      for k in bulk_ret:
          print('minion pool :\n'
                '------------')
          print(k['pool'])
          print('pool size :\n'
                '----------')
          print('    ' + six.text_type(len(k['pool'])))
          if is_first_time:
              is_first_time = False
              print('pool result :\n'
                    '------------')
              print('    ' + bulk_ret[0]['result'])
              print()
              continue
          outs = ('differences from "{0}" results :').format(
              bulk_ret[0]['pool'][0])
          print(outs)
          print('-' * (len(outs) - 1))
          from_result = bulk_ret[0]['result'].splitlines()
          for i in range(0, len(from_result)):
              from_result[i] += '\n'
          to_result = k['result'].splitlines()
          for i in range(0, len(to_result)):
              to_result[i] += '\n'
          outs = ''
          outs += ''.join(difflib.unified_diff(from_result,
                                               to_result,
                                               fromfile=bulk_ret[0]['pool'][0],
                                               tofile=k['pool'][0],
                                               n=0))
          print(outs)
          print()
      return bulk_ret