Call a shell command from Python

[Wildman]

On Tue, 01 Nov 2016 13:42:03 +0000, Grant Edwards wrote:

> On 2016-11-01, Steve D'Aprano <steve+python at pearwood.info> wrote:
>> On Tue, 1 Nov 2016 04:00 pm, Wildman wrote:
>>
>>> You are correct about that but, in this case grep never "sees" the '$'
>>> sign.  Bash expands $USER to the actual user name beforehand.  If you
>>> are on a Linux system, enter this into a terminal to illustrate:
>>> 
>>> sudo grep ^$USER\: /etc/shadow
>>
>> Bash is not involved here. Python is calling grep directly.
> 
> He's already been told this 6 times, and is willfully ignoring it.
> 
> Just give up.

That was not my intention.  I was trying to understand that
which I did not understand.  Ever been there?

-- 
<Wildman> GNU/Linux user #557453
The cow died so I don't need your bull!