test_tcp_port_alive.sh

#!/bin/bash

port=$1
if [ "$port" = "" ]; then
  echo "please input the port for check!"
  exit 1
fi


max_attempts=10
attempts=0
echo "lsof -i $port"
while [ "`lsof -i TCP:$port`" != "" ]
do
  echo "alive..."

  if [ "$attempts" = "$max_attempts" ]; then
      ./stop force
      exit 0
  fi

  echo "try $attempts, sleep 1"
  sleep 1
  (( attempts += 1))
done

echo "$port not alive!"