code: def dos2unix_dir(dir_name):
      modified_files = []
      os.path.walk(dir_name, dos2unix_one_dir, modified_files)
      return modified_files
  
imports: from __future__ import division, absolute_import, print_function
  import sys, re, os
label_desc: Use image node_id 3 for calling a global function with example usage: dos2unix_dir(dir_name) and returns: modified_files