newbie: popen question

Lie Ryan lie.1296 at
Sat May 30 03:55:21 CEST 2009

thebiggestbangtheory at wrote:
> On May 28, 5:31 am, Sebastian Wiesner <basti.wies... at> wrote:
>> <Sean DiZazzo – Donnerstag, 28. Mai 2009 10:11>
>>> Your best bet is to make sudo not ask for a password.  :)  If you
>>> don't have the rights, then you can use pexpect to do what you want to
>>> do.
>>> See the second example on that page.
>>> child = pexpect.spawn('scp foo myn... at')
>>> child.expect ('Password:')
>>> child.sendline (mypassword)
>> The sudo password prompt is very configurable, so changing the configuration
>> to allow execution without password input is really the best option.
>> --
>> Freedom is always the freedom of dissenters.
>>                                       (Rosa Luxemburg)
> Thanks guys for helping out! very good answers :-)
> Before I saw your answers, I tried the following,
> output = subprocess.Popen(["sudo","-b", "", "arg1"],
> stdout=subprocess.PIPE).communicate()[0]
> This seemed to push the shell execution process to the background and
> because my python program was invoked initially with sudo, it seems I
> did not need to enter a passwd again.
> Any comments about this..any issues that you see will crop up?
> Thanks a ton again.

Is using gksu or kdesu feasible? Or maybe you could run "sudo -v" which
activates sudo then immediately run your "sudo command". This relies on
sudo not configured to not use timestamp though.

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