#!/bin/ksh

exposed_udp_in=$(netstat -l -n -finet -pudp |\
  awk '$4 !~ /^127\.0\.0\.1.*$/ && $1 == "udp" {print $4}')

output=""
if [ ! -z "$exposed_udp_in" ]; then 
    output=$output"[ "
    for i in $exposed_udp_in; do
        port="${i##*.}"
        output="$output\"$port\","
    done
    output=${output%?}" ]"
fi
echo $output