Goofile is other python tool which is used for finding the different files existed in the website. There is only single command line in the usage of the tool.
Open your backtrack terminal and type cd /pentest/enumeration/google/goofile
If you would like to search for files with the extension "pdf" on this website, run this command:
Python goofile.py –d www.example.com –f pdf
-d: domain to search
-f: filetype (ex. pdf)