find free port

findfreeport.sh

#!/bin/bash


i=8031;
for (( ; ; ))
do
   _="$((i++))"
   # echo "Number: $((i++))"
   #netstat -apn|grep 8001|wc |awk '{print $1}'

   X=$(netstat -apn|grep $i |wc|awk '{print $1}')
   echo $X
   if (( x < 1 )); then
      echo use "$i"
   fi
   sleep 1
done