code: def _copy_id_str_old(self):
          '''
          Return the string to execute ssh-copy-id
          '''
          if self.passwd:
              # Using single quotes prevents shell expansion and
              # passwords containing '$'
              return "{0} {1} '{2} -p {3} {4} {5}@{6}'".format(
                      'ssh-copy-id',
                      '-i {0}.pub'.format(self.priv),
                      self._passwd_opts(),
                      self.port,
                      self._ssh_opts(),
                      self.user,
                      self.host)
          return Nonf _copy_id_str_old(self):
          '''
          Return the string to execute ssh-copy-id
          '''
          if self.passwd:
              # Using single quotes prevents shell expansion and
              # passwords containing '$'
              return "{0} {1} '{2} -p {3} {4} {5}@{6}'".format(
                      'ssh-copy-id',
                      '-i {0}.pub'.format(self.priv),
                      self._passwd_opts(),
                      self.port,
                      self._ssh_opts(),
                      self.user,
                      self.host)
          return None
docs: Return the string to execute ssh-copy-id