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To: python-list@python.org
From: Dieter Maurer <dieter@handshake.de>
Subject: Re: os.system and subprocess odd behavior
Date: Sat, 15 Dec 2012 08:12:15 +0100
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Xref: csiph.com comp.lang.python:34884

py_genetic <conor.robinson@gmail.com> writes:

> Example of the issue for arguments sake:
>
> Platform Ubuntu server 12.04LTS, python 2.7
>
> Say file1.txt has "hello world" in it.
      ^^^^^^^^^
Here, you speak of "file1.txt" (note the extension ".txt")

> subprocess.Popen("cat < file1 > file2", shell = True)
> subprocess.call("cat < file1 > file2", shell = True)
> os.system("cat < file1 > file2")

But in your code, you use "file1" (without extension).

If your code really references a non-existing file, you may well
get what you are observing.