Get total number of active and closing connections for a given port

port_conn_top.sh

!/bin/bash

PORT=$1

if [ "$PORT" == "" ]; then
  echo "Usage: $0 [PORT]"
  exit 1
fi

while [ true ]
do

  clear
  CONNS=$(netstat -tulpna | grep :$PORT)
  ACTIVE=$(echo "$CONNS" | grep ESTABLISHED)
  CLOSING=$(echo "$CONNS" | grep FIN_WAIT)

  echo "Total connections:"
  echo "$CONNS" | wc -l
  echo "Total connections active:"
  echo "$ACTIVE" | wc -l
  echo "Total closing:"
  echo "$CLOSING" | wc -l
  sleep 2

done