new_contents: #!/usr/bin/env python
  """
  this script helps setup classpath env for HDFS, before running the program
  """
  import glob
  import sys
  import os
  import subprocess
  
  if len(sys.argv) < 2:
      print 'Usage: the command you want to run'
  
  hadoop_home = os.getenv('HADOOP_HOME')
  hdfs_home = os.getenv('HADOOP_HDFS_HOME')
  java_home = os.getenv('JAVA_HOME')
  if hadoop_home is None:
      hadoop_home = os.getenv('HADOOP_PREFIX')
  assert hadoop_home is not None, 'need to set HADOOP_HOME'
  assert hdfs_home is not None, 'need to set HADOOP_HDFS_HOME'
  assert java_home is not None, 'need to set JAVA_HOME'
  
  (classpath, err) = subprocess.Popen('%s/bin/hadoop classpath' % hadoop_home,
                                      stdout=subprocess.PIPE, shell = True,
                                      env = os.environ).communicate()
  cpath = []
  for f in classpath.split(':'):
      cpath += glob.glob(f)
  
  lpath = []
  lpath.append('%s/lib/native' % hdfs_home)
  lpath.append('%s/jre/lib/amd64/server' % java_home) 
  
  env = os.environ.copy()
  env['CLASSPATH'] = '${CLASSPATH}:' + (':'.join(cpath))
  env['LD_LIBRARY_PATH'] = '${LD_LIBRARY_PATH}:' + (':'.join(lpath)) 
  ret = subprocess.call(args = sys.argv[1:], env = env)
  sys.exit(ret)
  
subject: fix more