#!/bin/bash
# Define PDF detection regex
 pattern='GET /(.*.pdf)'
# Grab latest lines in log file and check against regex
 tail -f access_log | grep --line-buffered .pdf | while read line; do
 echo $line
 if [[ $line =~ $pattern ]]; then
 # PDF filename is stored in BASH_REMATCH
 myfile=${BASH_REMATCH[1]}
 fi
 #Trigger for Universal Analytics endpoint, with event tracking
 wget -q -O  /tmp/pixel.gif "http://www.google-analytics.com/collect?v=1&t=event&tid=UA-7634164-5&cid=555&dh=juliencoquet.com&ec=Downloads&ea=PDF&el=$myfile&ev=1&cm3=1"
done