Kill a program based off the port by PID

murk.sh

#!/usr/bin/env bash

# Usage murk <port_number>

if [[ $# -eq 1 ]]; then
  pid_array=( ` lsof -i:$1 -t ` )
  pid_array_length=${#pid_array[@]}
  if [[ "$pid_array_length" -eq "0" ]]; then
    echo "No PID's on that port number have been found"
  fi
  for element in "${pid_array[@]}"
  do
    i=0
    while [ $((i)) -lt $((pid_array_length)) ]; do
      echo $i: ` lsof -i:$1 | tail -n +2 | awk '{print $1,$2}'  `
      ((i++))
      if [[ $((i)) -eq $((pid_array_length)) ]]; then
        if [[ $((pid_array_length)) -lt 2 ]]; then
          read -p "Do you wish to kill ${pid_array[0]}? (y/n): " yn
          case $yn in
            y ) kill ${pid_array[0]}
            echo "Process ${pid_array[0]} has been killed"
            exit 1;;
            n ) echo "Program aborted";
            exit;;
            * ) echo "Invalid response, please try again";
            exit 1;;
          esac
        else
          read -p "Enter what number you wish to execute, q for quit: " sel2
          if [[ $sel2 = "q" ]]; then
            exit 1
          elif [[ $((sel2)) -lt $((pid_array_length)) ]]; then
            kill ${pid_array[$sel2]}
            echo "Process ${pid_array[$sel2]} has been killed"
            exit 1
          else
            echo "Incorrect input, please try again."
          fi
        fi
      fi
    done
  done
else
  printf "Insufficient amount of arguments \n Usage: \n murk <port_number>\n"
fi