Re: Simulate `bash` behaviour using Python and named pipes.

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From	Gregory Ewing <greg.ewing@canterbury.ac.nz>
Newsgroups	comp.lang.python
Subject	Re: Simulate `bash` behaviour using Python and named pipes.
Date	Sat, 10 Aug 2013 13:07:03 +1200
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Luca Cerone wrote:
> Thanks! I managed to make it work using the threading library :)

If at least one of the external programs can accept the source
or destination as a filename argument instead of redirecting its
stdin or stdout, you can also do something like this:

import subprocess

p2 = subprocess.Popen(["cat", "named_pipe"])
pipe = open("named_pipe", "w")
p1 = subprocess.Popen(["ls", "-lah"], stdout = pipe)
pipe.close()
p1.wait()
p2.wait()

That works because opening the reading end of the pipe is
done by the subprocess executing cat, leaving the main
process free to open the other end.

-- 
Greg

Thread

Simulate `bash` behaviour using Python and named pipes. Luca Cerone <luca.cerone@gmail.com> - 2013-08-05 06:09 -0700
  Re: Simulate `bash` behaviour using Python and named pipes. Paul Wiseman <poalman@gmail.com> - 2013-08-05 14:39 +0100
    Re: Simulate `bash` behaviour using Python and named pipes. Luca Cerone <luca.cerone@gmail.com> - 2013-08-05 06:51 -0700
  Re: Simulate `bash` behaviour using Python and named pipes. MRAB <python@mrabarnett.plus.com> - 2013-08-05 15:03 +0100
    Re: Simulate `bash` behaviour using Python and named pipes. Luca Cerone <luca.cerone@gmail.com> - 2013-08-05 07:11 -0700
      Re: Simulate `bash` behaviour using Python and named pipes. MRAB <python@mrabarnett.plus.com> - 2013-08-05 15:51 +0100
        Re: Simulate `bash` behaviour using Python and named pipes. Luca Cerone <luca.cerone@gmail.com> - 2013-08-05 08:27 -0700
          Re: Simulate `bash` behaviour using Python and named pipes. MRAB <python@mrabarnett.plus.com> - 2013-08-05 17:08 +0100
            Re: Simulate `bash` behaviour using Python and named pipes. Luca Cerone <luca.cerone@gmail.com> - 2013-08-05 09:54 -0700
              Re: Simulate `bash` behaviour using Python and named pipes. MRAB <python@mrabarnett.plus.com> - 2013-08-05 20:45 +0100
                Re: Simulate `bash` behaviour using Python and named pipes. Luca Cerone <luca.cerone@gmail.com> - 2013-08-05 14:47 -0700
                Re: Simulate `bash` behaviour using Python and named pipes. MRAB <python@mrabarnett.plus.com> - 2013-08-05 23:42 +0100
                Re: Simulate `bash` behaviour using Python and named pipes. Luca Cerone <luca.cerone@gmail.com> - 2013-08-06 09:25 -0700
                Re: Simulate `bash` behaviour using Python and named pipes. Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-08-10 13:07 +1200
  Re: Simulate `bash` behaviour using Python and named pipes. Alister <alister.ware@ntlworld.com> - 2013-08-05 14:29 +0000
    Re: Simulate `bash` behaviour using Python and named pipes. Luca Cerone <luca.cerone@gmail.com> - 2013-08-05 07:59 -0700
      Re: Simulate `bash` behaviour using Python and named pipes. Neil Cerutti <neilc@norwich.edu> - 2013-08-05 16:00 +0000

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