[Tutor] How to run multiline shell command within python

Hugo Arts hugo.yoshi at gmail.com
Thu Jan 10 09:31:43 CET 2013


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
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