Help with autostart plugin

I'm starting developing plugins  

I want to call one sh script when my plugin start's up on boot, but how I can do that?

def autostart(reason, **kwargs):
	## HOW I CALL ONE SH SCRIPT?
	

def Plugins(**kwargs):
	return [PluginDescriptor(
				where =  PluginDescriptor.WHERE_AUTOSTART,
				fnc = autostart)]

Thanks