how to run a shell script with super user privs when my network get disconnected!!!
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You can write a shell script checking the state of the network and/or interface, next if the network is unavailable or the interface is down or combination of both run some command in your script to connect again.
Test the script to see if it works and does what you want/need it to do and then plan it to run like every 10 minutes using cron.
But I believe it's most important to look for the underlying reason why you get disconnected and not write a solution. If the network or interface goes down on a regular basis there must be a reason for that. If you find what causes it maybe you can fix it so there will be no need for a script.