How to pass `echo t | ` as arg in `subprocess.check_output`

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November 26th, 2012, 04:29 AM

dachakku

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How to pass `echo t | ` as arg in `subprocess.check_output`

Hi,

I have called an exe using subprocess.check_output from my python script.

Code:

res = subprocess.check_output(["svn.exe", "list", "Https://127.0.0.1:443/svn/Repos"], stderr=subprocess.STDOUT)

when the script is executed, it would ask user to enter an input key,

Code:

(R)eject, accept (t)emporarily or accept (p)ermanently?

In Command prompt, i am able to pass the input key to the process while calling itself with below command and i am able to get the output:

Code:

echo t | svn.exe list Https://127.0.0.1:443/svn/Repos

from python to call the exe, i am not able to pass the "echo t | " in subprocess.check_output function.

Is there any way to do this.
Please help.

November 26th, 2012, 10:18 AM

b49P23TIvg

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use shell=True
unix example:
subprocess.check_output("echo t | cat", shell=True,stderr=subprocess.STDOUT)

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November 28th, 2012, 06:36 AM

dachakku

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Quote:

Originally Posted by b49P23TIvg

use shell=True
unix example:
subprocess.check_output("echo t | cat", shell=True,stderr=subprocess.STDOUT)

Hi b49P23TIvg,
Thanks for your input. but that doesnt work for me.
I resolved the issue by using two subprocesses, and providing the output of the first process as input to second process.

Code:

p = subprocess.Popen("echo t |", shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
p1 = subprocess.Popen(["svn.exe", "list", "Https://127.0.0.1:443/svn/Repos"], shell=True, stdin=p.stdout, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
output = p1[0]

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