Re: [Tutor] How to run multiline shell command within python

[Karim]

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 <kliat...@gmail.com <mailto:kliat...@gmail.com>> wrote:

    On 10/01/2013 09:31, Hugo Arts wrote:

    On Thu, Jan 10, 2013 at 7:01 AM, Karim <kliat...@gmail.com
    <mailto:kliat...@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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Thanks Matty!

I will have a look specially for interactive session.

Regards
Karim

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