#!/usr/bin/env bash
#
# List open (listened) ports, without the crud that
# usually comes with `lsof -i`
#
# Originally from: https://www.commandlinefu.com/commands/view/8951
# Original author: https://www.commandlinefu.com/commands/by/wickedcpj
#
echo 'User:                Command:                  Port:'
echo '====================================================='

lsof -i 4 -P -n +c 0 \
  | grep -i 'listen' \
  | awk '{print $3, $1, $9}' \
  | sed 's/ [a-z0-9\.\*]*:/ /' \
  | sort -k 3 -n \
  | xargs printf '%-20s %-25s %-5s\n' | uniq

echo ""