inspiração de:
http://stackoverflow.com/questions/8019742/measure-traffic-from-apache-access-log
#!/bin/bash
for arg in `find /var/log/httpd/ -maxdepth 3 -type f -name *access.log`
do
echo ${arg}
data=`cat ${arg} | perl -e 'my $sum=0; while(<>) { my ($traffic) = m/[.+] ".+" d+ (d+)/; $sum += $traffic}; printf("%.3f", $sum/1024/1024/1024)'`
echo "$data GB"
echo
done