def realtime_run(totalArgs):
    process = subprocess.Popen(totalArgs, bufsize=0, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True)
    while True:
        nextline = process.stdout.readline()
        if nextline == '' and process.poll() is not None:
            break
        sys.stdout.write(nextline)
        sys.stdout.flush()

    output = process.communicate()[0]
    exitCode = process.returncode

    if (exitCode == 0):
        return output
    else:
        raise subprocess.CalledProcessError(exitCode, " ".join(totalArgs), output)