#!/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 "";