Checks if a port is active, and if so, queries which server is running.

port_check.sh

#!/bin/sh
# Mohamed Mansour (http://mohamedmansour.com)

if [ $# -ne 1 ]; then
  echo "Usage: port_checker <port>"
  exit 1
fi

PORT=$1 

if ! [[ "$PORT" =~ ^[0-9]+$ ]]; then
  echo "Invalid argument: port must be a number.";
  exit 1
fi
 
 
PID=$(netstat -tulpn | grep ":$PORT " | awk ' { split($7, array, "/") } END{ print array[1] } ')
if [ ! -n "$PID" ]; then
 echo "No port is running on $PORT"
else
 CWD=$(lsof -p $PID | awk '$4 == "cwd" { print $9 }')
 TXT=$(lsof -p $PID | awk '$4 == "txt" { print $9 }')
 echo "$TXT is running on port $PORT with pid $PID in $CWD"
fi