Question about pipes/os.popen

[Kevin Walzer]

Steve Holden wrote:


>>
> Probably expecting sudo to read the standard input for its password.
> 
> First of all, sudo doesn't always ask for your password. Secondly, when
> it does I'm pretty sure it will take care to try and do it on the
> controlling tty, not by reading stdin.
>

sudo wasn't the problem. I've used a similar command structure (echo foo
| sudo -S command) to invoke sudo from a program.

Here's the code I used to get this running successfully:

---
import os


file = os.popen('echo foo| sudo -S /usr/sbin/tcpdump  -v  -i en1', 'r')


for line in file:
    print line
---

I left out the "r" flag. D'oh.

I've gotten a bit lost among the various ways of invoking external
commands in Python (spawn, popen, system, subprocess). I'm glad os.popen
still works.

-- 
Kevin Walzer
Poetic Code
http://www.kevin-walzer.com