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Iv'e found this method of reconnecting the WIFI dongle from this post , but want to be clear on how it works, before I try and implement it.

1) Go to /etc/ifplugd/action.d/ and rename the ifupdown file to ifupdown.original,
2)Then do: cp /etc/wpa_supplicant/ifupdown.sh ./ifupdown
3) Finally: sudo reboot

1) When is /etc/ifplugd/action.d/ifupdown called ?

2) What does the script /etc/wpa_supplicant/ifupdown.sh essentially do in laymens terms, it looks pretty complex to me; and when is it called too.

3) Could doing steps 1 to 3 cause any other unforeseen problems that would lock me out (upset the WIFI) of my headless, hard to reach PI?

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