Unable to delete a file
Try deleting interactively to avoid deleting too much since these characters match one or many/no characters - you can answer y or n as needed as each file comes up for deletion...

e.g.

sudo rm -i 2011.09.0?*


If you can't get the wildcard right, move everything else out of the folder in question, go one directory level up and rm -r &lt;foldername&gt;.