Shell Programming and Scripting

I have a directory structure with multiple sub directories. Within each directory, there are files without extensions. Is it possible to somehow tell what the file type should be by the file contents?

For example, I opened one of the files using an editor. After scrolling to the end of the file, I can tell the file is a Microsoft Word document. So after closing the file, I add ".doc" to the end of the filename.

I want to automate this process if possible.

Code:

for file in $(find /PATH -type f)
do
  tail -10 "$file"|grep "special Microsoft Keyword
  if [ $? -eq 1 ]; then
     echo " $file is not Microsoft Word file."
  else
     echo mv "$file" "$file.doc"
  fi
done

after confirm, remove second echo.

Hi.
cheers, drl