From: Shannon Fang <xrfang@...>
Date: 2005-10-27T15:44:54+09:00
Subject: Detection of redirection, possible?

Hi All,

How can I detect a ruby program's stdio has been redirected? I would like to 
do this:

puts "show message to user"
$stdin.gets unless $stdin.redirected?

This way, if the program runs normally, it show message and wait for user 
interaction, if it is redirected to a file, then just puts to that file 
without wating for user intervention.

Thanks!
Shannon