please help me understand os.system() result

[Erik Max Francis]

Eric Brunel wrote:

> According to the library reference ( 
> http://www.python.org/doc/current/lib/os-process.html#l2h-1226 ): ...

Note that the the return values of os.system and os.wait are just the
same values as their POSIX counterparts, so this is not peculiar to
Python.

> Please note that wait, system and the like have quite a tendency to
> return None
> if the command ran to completion without problem, so you're unlikely
> to get 0 as
> a result.

I'm not sure what this means; under what circumstances does it return
None?  Doing so would violate the specification as laid out in the
documentation.

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