It is not necessarily a bad idea. He is not saying he wants to run an 
arbitrary command.
If the command is, for example, "ls -l > mydir" you can run it with

import os
os.system("ls -l > mydir")

There are some caveats:
- do not run the commands that can take long time otherwise
- consider using the scheduler 
- it may be a security hazard to run arbitrary commands 



On Tuesday, 18 November 2014 04:06:28 UTC-6, Leonel Câmara wrote:
>
> This is a very very bad idea, it's also a python question not a web2py one 
> (it's possible btw), what are you trying to accomplish?
>

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