Script to list all the open ports

This could be a very good utility to check the open ports in the server.

#!/bin/sh

export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

if [ -e /etc/master.passwd ]; then
netstat -an | grep LISTEN | grep “*” | awk ‘{print $4 }’ | cut -d. -f2 | sort -n | uniq
else
netstat -an | grep LISTEN | grep -v STREAM | grep : | awk ‘{print $4 }’ | cut -d: -f2-4 | cut -d : -f3 | sort -n | uniq