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#!/bin/sh
while true;do
signal=`iwconfig $INTERFACE | grep Signal| perl -pe 's/.*level=//; s/ dBm.*//'`
#convert to Quality
if [ $signal -le -100 ];then
quality=0;
elif [ $signal -ge -50 ];then
quality=100;
elif [ -z $signal ];then
quality=0;
else
quality=$(( 2 * ( $signal + 100 )));
fi
echo "S$quality";
sleep 3;
done
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