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I'm redirecting stderr to a file with 

python foo.py 2> stderror.txt

Once the script is partway done, I want to move stderror.txt with 

subprocess.call(['cp', 'stderror.txt', 'destination.txt'])

My question - what if I redirected stderr to results/stderror.txt? Is there a way to programmatically get the destination of a redirect from within the script?

(Note: I know that this isn't really the way to solve my problem. Just curious.)

Martijn Pieters
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mfsiega
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1 Answers1

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One possible way is to read the link /proc/<pid>/fd/2:

os.readlink("/proc/%d/fd/2" % os.getpid())

A shortcut is to use /proc/self/fd/2. In the unredirected case, you'll get some special file in /dev, usually a pseudo terminal. For other OSes, see this related question.

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Phillip
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