for WIRECARD in `ip ad | awk 'BEGIN{FS=":"} {print $2}' | egrep '(eth[0-9]|wlan[0-9])' | sed -n 's/ //gp'`
do
aireplay-ng -9 $WIRECARD &> /dev/null
if (($?==0))
then
echo "the $WIRECARD could be used."
else
echo "the $WIRECARD could not be used"
fi
done
exit 0