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On Sat, 2009-06-06 at 08:06 -0600, Joshua Jensen wrote:
> The process exit code is the return value from the process object's 
> wait() function:
> exitcode = proc:wait()

I'm not sure I understand... popen() doesn't return a process object, it
returns a file handle.  Also, I don't see wait() or a process object in
the lua docs anyplace.  Is it part of an add-on module?  I don't think
there's any concept of process in ANSI-C, which is what the un-adorned
lua interpreter targets.