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    <p>Actually on Windows, it does use <code>cmd.exe</code> when <code>shell=True</code> - it prepends <code>cmd.exe /c</code> (it actually looks up the <code>COMSPEC</code> environment variable but defaults to <code>cmd.exe</code> if not present) to the shell arguments. (On Windows 95/98 it uses the intermediate <code>w9xpopen</code> program to actually launch the command).</p> <p>So the strange implementation is actually the <code>UNIX</code> one, which does the following (where each space separates a different argument):</p> <pre><code>/bin/sh -c gcc --version </code></pre> <p>It looks like the correct implementation (at least on Linux) would be:</p> <pre><code>/bin/sh -c "gcc --version" gcc --version </code></pre> <p>Since this would set the command string from the quoted parameters, and pass the other parameters successfully.</p> <p>From the <code>sh</code> man page section for <code>-c</code>:</p> <blockquote> <p><code>Read commands from the command_string operand instead of from the standard input. Special parameter 0 will be set from the command_name operand and the positional parameters ($1, $2, etc.) set from the remaining argument operands.</code></p> </blockquote> <p>This patch seems to fairly simply do the trick:</p> <pre><code>--- subprocess.py.orig 2009-04-19 04:43:42.000000000 +0200 +++ subprocess.py 2009-08-10 13:08:48.000000000 +0200 @@ -990,7 +990,7 @@ args = list(args) if shell: - args = ["/bin/sh", "-c"] + args + args = ["/bin/sh", "-c"] + [" ".join(args)] + args if executable is None: executable = args[0] </code></pre>
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    1. POWhy does subprocess.Popen() with shell=True work differently on Linux vs Windows?
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    1. USDavid Fraser
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    1. COThat's great, thanks David. I agree about the correct implementation and your patch looks good. Are you in a (better) position than I to submit a Python bug report -- in other words, have you done that before, or shall I look into it?
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    2. COAdded http://bugs.python.org/issue6689 - would be good if you could follow it, comment there etc
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    3. COThanks! I've added myself to the nosy list.
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