From: Jonathan Bale <webmaster@...>
Date: 2010-07-15T03:30:51+09:00
Subject: Re: Stdout as IO object

Brian Candler wrote:
> Jonathan Bale wrote:
>> Okay, real simple question, but somehow I am missing it in the API: how
>> do create an IO object that represents stdout? I'm using a certain
>> function that receives writable IO objects and I wanted to pass in the
>> standard output as a stream.
> 
> When your program starts, the constant STDOUT is an open file descriptor 
> for STDOUT, and the global variable $stdout also points to it.
> 
> Using the global variable is the recommended approach, as it adds more 
> flexibility for pointing it to a different object like a StringIO 
> without having warnings about constants being redefined.

The $stdout variable works fine. I was a little confused with $stdout at 
first, because the documentation I found either does not describe what 
it is, or talks about it as a "file descriptor". But it is actually an 
IO object:

$ irb
irb(main):001:0> $stdout.class
=> IO
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