#!/bin/bash
#                       /usr/local/bin/suscribers
# https://crystalfaeries.net/posix/bin/suscribers
# celeste:crystalfaery SUBSCRIBERS 2016-08-31 01:31:22+00:00
# list the subscribing IP addresses of my website RSS feed
grep .rss /var/log/apache2/access.log | grep -v 72.253.171.16 | grep -v 127.0.0.1 | sed 's/ .*$//' | sort -un


syntax highlighted by Code2HTML, v. 0.9.1