How to find the corresponding directory of a script, which runs a process on a specific port.

portfinder.sh

#!/usr/bin/env bash

# Run this script, after you gave it a name like portfinder, added
# it to your path runtime and gave it an execution flag:
# 	portfinder 3000

# Required system tools:
#   bash, lsof and pwdx

if [[ -z $1 ]]                                                                     
then                                                                               
  echo "Please provide a portnumber!"                                              
  echo "Example: portfinder 8080"                                                  
  exit 1                                                                           
fi

PORT=$1
PID=$( lsof -Fp -i:$PORT | head -n1 | cut -d 'p' -f 2 )
PROC=$( ps -p $PID -o comm= )
DIR=$( pwdx $PID | cut -d ':' -f 2)

echo "$PORT is used by $PROC ($PID) in $DIR"