[Bro] how to call a external command

[kong]

hello:

               when a event happpend ,how to make its event handler to call a
external command?For example , call a alarm program to alert
administrator or call a external command like iptables to respond the
attack event?

             Is there  a function like "exec()"  in C?
               
  

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Best regards,
 kong                          mailto:kong at etexchina.com