I'm currently working on a script where I have to send an email with this information: 

* List of files backed up.
* **What files were recently modified? Say 1 or 2 hours.**
* Size and location of the backup in the host.

This is what I have done so far:

```
echo "Message" | mailx -s "Subject" -a path/ofthe/file.tar aaa@mail.com

```

This sends a mail with attaching the .tar file but I need to know what files where changed, if there were any.