code: def get_command(all_pkg, hook):
      
      ret = []
      for r in all_pkg:
          module = importlib.import_module(__name__ + '.' + r.lower())
          ret.append(getattr(module, hook))
      return ret
docs: Collect the command-line interface names by querying ``hook`` in ``all_pkg``
  
      Parameters
      ----------
      all_pkg: list
          list of package files
      hook: str
          A variable where the command is stored. ``__cli__`` by default.
      Returns
      -------
      list