How I can know when a deamond is activated?

[Julio Argota]

How I can know when a deamond is activated?. Example if a USB memory is
inserted ubuntu, more specific usbfs deamon, automount the memory and open a
nautylus windows. How I can performance a task when it happend. I have a
bash script whit the actions that I to do, but I don't know where to place
this.

-- 
Atte Julio N. Argota Q.
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