From: gwtmp01@...
Date: 2005-06-28T06:21:20+09:00
Subject: Re: redirecting STDOUT


On Jun 27, 2005, at 4:52 PM, Joe Van Dyk wrote:
> Nevermind, it does work!
>
> My test application was the following Ruby application:
>
> #!/bin/env ruby
> while true
>   puts "pid: #{Process.pid}, time: #{Time.now}"
>   sleep 0.2
>   puts
> end
>
> Does #puts not write to STDOUT by default?

Buffering.  When you run this program with output
associated with the terminal, STDOUT is line buffered
so you see each line right after puts executes.

When you redirect STDOUT to a file, the IO is not
line buffered but instead buffered into blocks.
When I tested your program, I didn't see any output
in the file until puts had generated 4k worth of
data at which point it was flushed to the file
system.

You'll have to put in explicit calls to flush if
you expect to see the output in a different way or
change STDOUT to be line buffered.


Gary Wright