From: Brian Candler <b.candler@...>
Date: 2010-08-02T23:23:18+09:00
Subject: Re: IO.popen

Roger Pack wrote:
> I assume the doc's are "just wrong" when they say you can access an
> IO.popen with any mode you'd like?
> 
> http://ruby-doc.org/core/classes/IO.html#M002242
> 
>>> IO.popen("gocr", "rw")
> ArgumentError: invalid access mode rw
> 
> Is this expected?

Yes. It doesn't say "any mode you'd like"; it says "any of the modes 
listed in the description for class IO" - that is, any *valid* mode :-)

You're probably looking for mode "r+" or "a+"

http://ruby-doc.org/core/classes/IO.html
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