[Tutor] How to run multiline shell command within python

Matty Sarro msarro at gmail.com
Thu Jan 10 16:21:53 CET 2013


Have you looked a the pexpect class? It works like gangbusters, especially
if you're trying to run something with an interactive shell.

http://www.noah.org/wiki/pexpect


On Thu, Jan 10, 2013 at 9:25 AM, Karim <kliateni at gmail.com> wrote:

>  On 10/01/2013 09:31, Hugo Arts wrote:
>
> On Thu, Jan 10, 2013 at 7:01 AM, Karim <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
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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