Using KM (& Hazel) to shutdown my Mini, in a power outage

I don’t really follow why you’re involving Hazel and the file system for this?

Why not just:

Trigger macro every minute
If [wireless network "blah" is connected](http://wiki.keyboardmaestro.com/condition/Wireless_Network)
    Set variable "Wireless Network Missing" to 0
Else
    Set variable "Wireless Network Missing" to calculation "Wireless Network Missing + 1"
    If calculation Wireless Network Missing > 3 then
        Panic!
   Else
        Notify "Trouble?"