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def get_last_modified(dir)

	# make sure the files to be checked are in the provided directory
	files = Dir.new(dir).select { |file| file!= '.' && file!='..' }

	# make sure the file has been written to
	return nil if (files.size < 1)

	# create an array of all the files
	files = files.collect { |file| File.join(dir , file) }


	# sort array by last modified
	files = files.sort { |a,b| File.mtime(b)<=>File.mtime(a) }

	# return the last modified file
	return files.first

end