# $Id$
import time
import os

def header(message):
    now=time.strftime("%H:%M:%S", time.localtime())
    print "*",now,'--',message


def popen(command, fatal=True):
    (stdin, stdout, stderr) = os.popen3(command)
    output = stdout.readlines()
    
    # filter output generated by set x
    remove_set_x = lambda line: not line.startswith("+") 	 
    errors = filter(remove_set_x, stderr.readlines())
    
    if fatal and errors:
	raise Exception, "\n".join(errors)	
    return (output, errors)