[copirate]

Of course, you can easily chain many commands in the pipeline:

    last_stdout, wait_threads = Open3.pipeline_r(
      ["gzcat", "some.txt"],
      ["grep", "foo"],
      ["sort", "-u"],
      ["head", "-10"],
    )

I'm not sure what you mean by lazily here, but internally[0] it creates real anonymous pipes[1] between the spawned processes, so the data does not go through the ruby process at all.

[0] https://github.com/ruby/open3/blob/b8909222051b4103a19eba195...

[1] https://en.wikipedia.org/wiki/Anonymous_pipe