.. efun:: int command(string str)
  int command(string str, object ob)

  Execute str as a command given directly by the user. Any effects of the command will apply to the current object, or to :arg:`ob`.

  Return value is 0 for failure. Otherwise a numeric value is returned which tells the evaluation cost. Bigger number means higher cost. The evaluation cost is approximately the number of LPC machine code instructions executed.

  If :efun:`command` is called on another object, it is not possible to call static functions in this way, to give some protection against illegal forces.

  Commands are stacked, meaning that after the given command :arg:`str` has finished, the old settings of :efun:`this_player`, :efun:`query_verb` etc, are restored.

  .. todo:: this said: Up to 3.2.6 in native mode, commands could be applied to the current object only.; I've attempted to read the tea leaves

  :history 3.2.6 changed: in native mode, commands are no longer limited to the current object only.
  :history 3.2.7 changed: commands are stacked.

  .. seealso:: :efun:`command_stack`, :efun:`notify_fail`, :efun:`enable_commands`, :efun:`get_eval_cost`