I need some help to complete the below script, after executing below script blank lines are coming, but i am expecting 4 digit numeric no. Please solve the issue ASAP.
function portno
{
while (true)
do
random=`echo $RANDOM | cut -c 1-4`
port=`netstat -a | grep -c $random`
if [ $port -ne 1 ];
then
break
else
continue
fi
done
return $port
}
port1=`portno`
port2=`portno`
echo "$port1"
echo "$port2"