Prepend files in current directory with specified text. I used this Gist to prepend my imported blog (markdown files) to serve with Jekyll.

prepend.py

#!/usr/bin/env python
# encoding: utf-8

import os

text_to_prepend = '# encoding: utf-8'

for root, dirs, files in os.walk('./'):
    for f in files:
        if f != 'prepend.py':
            with file(f, 'r') as original:
                data = original.read()
            with file(f, 'w') as modified:
                modified.write(text_to_prepend + '\n' + data)