From: Brian Candler <b.candler@...>
Date: 2009-05-22T16:35:15+09:00
Subject: Re: I want to redirect stderr to StringIO.

Robert Klemme wrote:
> Please do not let yourself be distracted by the warning.  The crucial
> point is that after $defout has been reassigned the "2" does not appear
> any more on the screen => this is the object which is used by #puts.

Just do what the warning says, and use $stdout instead of $defout:

$ ruby -r stringio -e 'puts 1; $stdout=StringIO.new; puts 2'
1
$

However this doesn't help the OP who wanted to redirect STDERR. You can 
redirect $stderr, but lots of code writes to STDERR instead of $stderr.
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