Donn Cave <[EMAIL PROTECTED]> writes:
> In article <[EMAIL PROTECTED]>,
> Grant Edwards <[EMAIL PROTECTED]> wrote:
>
>> On 2005-06-10, Mage <[EMAIL PROTECTED]> wrote:
>>
>> >>py> file_list = os.popen("ls").read()
>> >>
>> >>Stores the output of ls into file_list.
>> >>
>> > These commands invoke shell indeed.
>>
>> Under Unix, popen will not invoke a shell if it's passed a
>> sequence rather than a single string.
>
> I suspect you're thinking of the popen2 functions.
> On UNIX, os.popen is posix.popen, is a simple wrapper
> around the C library popen. It always invokes the
> shell.
>
> The no-shell alternatives are spawnv (instead of
> system) and the popen2 family (given a sequence
> of strings.)
Don't forget the one module to rule them all, subprocess:
file_list = subprocess.Popen(['ls'], stdout=subprocess.PIPE).communicate()[0]
which by default won't use the shell (unless you pass shell=True to it).
--
|>|\/|<
/--------------------------------------------------------------------------\
|David M. Cooke
|cookedm(at)physics(dot)mcmaster(dot)ca
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