Redirect an output command to a variable or file?

Question

I'm trying to write a python script that will allow me to take the output from a command and to put that into a file or variable (Preferability a variable).

In my code, I have redirected the output to a StringIO() object. From that, I want take the output a command and to put it into that StringIO() object.

Here is a sample of my code:

from StringIO import StringIO import sys old_stdout = sys.stdout result = StringIO() sys.stdout = result # This will output to the screen, and not to the variable # I want this to output to the 'result' variable os.system('ls -l')

Also, how do I take result and put it into a string?

Thanks in advance!!

possible duplicate of Running shell command from python and capturing the output — DocMax
– DocMax, Commented Nov 20, 2012 at 21:01

glglgl · Accepted Answer · 2012-11-20 15:35:07Z

5

import subprocess sp = subprocess.Popen(['ls', '-l'], stdout=subprocess.PIPE) output, _ = sp.communicate() print "Status:", sp.wait() print "Output:" print output

answered Nov 20, 2012 at 15:35

glglgl

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2 Comments

Rob Avery IV Over a year ago

In my real code, I'm not using ls -l. I'm using the command find *. When I use find * in place of ls -l from the code you have in your comment, it doesn't give anything, though when I go to the normal command line, it outputs everything normal. When I use ls -l it works fine. Suggests?

glglgl Over a year ago

You can use the Popen() argument shell=True and give it a string to be executed. Or you could use ['find', '.'] which should essentially be the same, more or less.

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