Autotrash is a simple Python script which will purge files from your trash based on their age or the amount of free space left on the device. Using
autotrash -d 30 will delete files which have been in the trash for more then 30 days. It uses the FreeDesktop.org Trash Info files included in the new GNOME system to find the correct files and the dates they where deleted.
You can download the newest releases from github.
There is a project already packaged inside the Ubuntu archive which can achieve the same results called trash-cli. This package also promotes aliasing
rm, I personally have opted to alias
All code is available under the GNU General Public License version 3+.