Execute bash script from URL using python

Question

Assume I have a file at http://mysite.com/myscript.sh that contains:

#!/bin/bash
echo "Hello $1"

From the command line, I can execute my script (without downloading it) using the following command:

bash <(curl -s http://mysite.com/myscript.sh) World

Now, instead of executing the above command from the command line, I want to execute it from a python script. I tried doing the following:

import os
os.system('bash <(curl -s http://mysite.com/myscript.sh) World')

...but I get the following error:

sh: -c: line 0: syntax error near unexpected token `('

How do I make this execute correctly in python?

Kevin · Accepted Answer · 2012-03-19 20:56:04Z

1

Evidently, os.system runs its command through /bin/sh, which usually causes whichever shell it's linked to to drop to a compatibility mode that doesn't include the <(...) construction. You can get around it by either storing the result in a temporary file or using another level of shell. Ugly, but it works.

os.system('bash -c "bash <(curl -s http://mysite.com/myscript.sh) World"')

edited Mar 19, 2012 at 20:56

answered Mar 19, 2012 at 20:39

Kevin

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3 Comments

Siou Over a year ago

That almost works, except it doesn't seem to pick up the 'World' parameter.

Siou Over a year ago

It works if I leave out the double quotes: os.system('bash -c $(curl -s mysite.com/myscript.sh) World')

Kevin Over a year ago

@Siou Apparently there is some odd interpretation of arguments going on. I've updated and tested this.

deinonychusaur · Accepted Answer · 2012-03-19 20:51:25Z

0

There is a libcurl for python so you don't have to go the way around to command line behaviour. Here's the function list that should really do it - have never run remote scripts myself though. If you need installing the python binding, the instructions are here.

import curl

answered Mar 19, 2012 at 20:51

deinonychusaur

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