How do I pipe a subprocess call to a text file?

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If you want to write the output to a file you can use the stdout-argument of subprocess.call.

It takes either

  • None (the default, stdout is inherited from the parent (your script))
  • subprocess.PIPE (allows you to pipe from one command/process to another)
  • a file object or a file descriptor (what you want, to have the output written to a file)

You need to open a file with something like open and pass the object or file descriptor integer to call:

f = open("blah.txt", "w")
subprocess.call(["/home/myuser/run.sh", "/tmp/ad_xml",  "/tmp/video_xml"], stdout=f)

I’m guessing any valid file-like object would work, like a socket (gasp :)), but I’ve never tried.

As marcog mentions in the comments you might want to redirect stderr as well, you can redirect this to the same location as stdout with stderr=subprocess.STDOUT. Any of the above mentioned values works as well, you can redirect to different places.

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