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Asked: 2026-06-14T17:53:53+00:00

I have a simple command-line utility which produces output both on the console and

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I have a simple command-line utility which produces output both on the console and the filesystem. While I know very well how to capture the console output, I am not aware how can I also intercept the file – for which I know the filename in advance.

I would like to keep the execution “in memory” without touching the filesystem as I immediately parse and delete the file created and this creates an unnecessary bottleneck (especially when I need to run the little tool millions of times).

So, to sum up, I am trying to achieve following:

  1. Run a binary using python’s subprocess
  2. Capture both the tool’s output AND contents of a file it creates (in current working directory with in-advance known name)
  3. Ideally, run it all without touching the filesystem.
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1 Answer

  1. Editorial Team

    Since you only need to support Linux, one possibility is to use named pipes. The idea is to pre-create the output file as a named pipe, and have your process read the tool’s output from the pipe.

    See, for example, Introduction to Named Pipes.

    The Python API is os.mkfifo().

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