[Tutor] How to run multiline shell command within python

Karim kliateni at gmail.com
Thu Jan 10 15:25:57 CET 2013


On 10/01/2013 09:31, Hugo Arts wrote:
> On Thu, Jan 10, 2013 at 7:01 AM, Karim <kliateni at gmail.com 
> <mailto:kliateni at gmail.com>> wrote:
>
>
>
>     Hello all,
>
>     I want to run multiline shell command within python without using
>     a command file but directly execute several lines of shell.
>     I already use *subprocess.checkoutput("csh -f
>     my_file.csh".split())* but I want to know if it is posssible to
>     avoid making file and execute
>     shell lines of code directly.
>
>
> Yes, this is very possible. Specify shell=True as an argument and you 
> can do anything you can do in a shell:
>
>  >>> commands = """echo hello
> ... echo hello | wc -l
> ... ps aux | grep python"""
> >>> b = subprocess.check_output(commands, shell=True)
> >>> print(b.decode('ascii'))
> hello
> 1
> hugo      1255  1.0  0.6 777316 49924 ?        Sl 09:14   0:08 
> /usr/bin/python2 /usr/bi
> hugo      6529  0.0  0.0  42408  7196 pts/0    S+ 09:23   0:00 python
> hugo      6559  0.0  0.0  10656  1128 pts/0    S+ 09:28   0:00 grep python
>
> >>>
>
> watch out though, accepting user input into the commands variable will 
> lead to shell injection, which can be a dangerous security vulnerability.
>
> HTH,
> Hugo

Many thanks Hugo. It makes my day!
In my case there are no possibilities for shell injection. It is 
internal to a class.

Regards
Karim

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