Execute another program from Pharo

> Hello,
> I want to execute another program from Pharo and collect the result
> (everything shown on the console) as a string.
>
> A basic example :
>
> *Console execute: 'ls -l /Users'*
>
> should return a string like:
>
> *'total 0*
> *drwxrwxrwt   6 root  wheel   204 25 jan 23:03 Shared* *drwxr-xr-x@  
> 46 user1
> user1   1564  4 jui 07:46 user1*
> *'*
>
> How can I do that ? A solution for OS-X is enough.
>
> Fréd
> ----
> Frédéric Pluquet
> Université Libre de Bruxelles (ULB)
> Assistant
> http://www.ulb.ac.be/di/fpluquet
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