code: def bash_rule(bash, hostnames):
      
      if isinstance(bash, dict):
          return make_fail('bash_rule',
                           error_message="Run this rule with a cluster archive")
  
      return make_pass('bash_rule', bash=bash, hostname=hostnames)
docs: Cluster rule to process bash and hostname info
  
      ``bash`` and ``hostnames`` are Pandas DataFrames for the facts collected
      for each host in the cluster.  See
      https://pandas.pydata.org/pandas-docs/stable/api.html#dataframe
      for information on available attributes and methods.
  
      Arguments:
          bash (pandas.DataFrame): Includes facts from ``bash_version``
              fact with columns "name" and "version" and one row per
              host in the cluster.
          hostnames (pandas.DataFrame): Includes facts from ``get_hostname``
              fact with column "hostname" and one row per
              host in the cluster.