[Tutor] How to run multiline shell command within python

Karim kliateni at gmail.com
Thu Jan 10 20:07:16 CET 2013


On 10/01/2013 16:21, Matty Sarro wrote:
> 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 
> <mailto: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
>>     <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
>
>
>     --
>     http://mail.python.org/mailman/listinfo/python-list
>
>

Thanks Matty!

I will have a look specially for interactive session.

Regards
Karim
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