code: def _execShowCmd(self, showcmd):
          
          result = None
          lines = self._execCmd("show", showcmd)
          if lines and len(lines) >= 2 and lines[0] != '' and lines[0][0] != '-':
              result = {}
              result['keys'] = lines[0].split(',')
              items = []
              for line in lines[1:]:
                  if line == '':
                      break
                  items.append(line.split(','))
              result['items'] = items
          return result
docs: Execute 'show' command and return result dictionary.
          
              @param cmd: Command string.
              @return: Result dictionary.