I would like to convert from the xferlog format that proftpd uses into per user in/out bytes, to have a summary on how much traffic does each user use per month.

The exact format is this:

Thu Oct 17 12:47:05 2013 1 123.123.123.123 74852 /home/vftp/doc1.txt b _ i r user ftp 0 * c
Thu Oct 17 12:47:06 2013 2 123.123.123.123 86321 /home/vftp/doc2.txt b _ i r user ftp 0 * c

So far I only found a script that makes a nice report but not exactly what I needed, that one can be found here

I might create a fork of this one and place it somewhere but it probably has been done a lot of times already.

Just found a well hidden page in proftpd site with some more examples here