From: Dave Bass <davebass@...>
Date: 2008-05-31T01:03:31+09:00
Subject: Re: getting standard error and output from ruby script in real time

Stefano Crocco wrote:
> of KDE. I'd be glad if someone could give
> me a hint on this, so that at least
> I can know whether I have to look for
> documentation about ruby or about 
> KDE.

It's to do with buffering. Buffering takes place within Ruby (I think) 
but also in the operating system. Stderr is usually unbuffered whereas 
stdout is usually buffered. I.e. the output is accumulated in a memory 
buffer until it reaches a certain size, then the block is flushed to the 
output stream. This is a lot more efficient that outputting it 
character-by-character to the output device.

In my experience (various languages and OSes), buffering can cause 
problems that are difficult or impossible to resolve.
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