gistfile1.txt

nohup(/tmp)% cat backup.sh 
#!/bin/bash

echo "almost done"
echo "omg error" >&2

nohup(/tmp)% cat tng.py 
#!/usr/bin/env python

from subprocess import *
import sys

logfile = open('backup.log', 'w')
p = Popen('./backup.sh', shell=True, bufsize=0, stdin=PIPE, stdout=PIPE, stderr=PIPE, close_fds=True)

for line in p.stdout.readlines():
	logfile.write(line)

for line in p.stderr.readlines():
	logfile.write(line)
	sys.stderr.write(line)

nohup(/tmp)% ./tng.py      
omg error
nohup(/tmp)% cat backup.log 
almost done
omg error