From: Justin Collins <justincollins@...>
Date: 2010-01-16T08:41:33+09:00
Subject: Re: How to know if $stderr is reopened to /dev/null

I単aki Baz Castillo wrote:
> Hi, how could I know if $stderr has been redirected to /dev/null?
> This is, imagine a program does:
>
>   $stderr.reopen "/dev/null"
>
> And later I want to check if it's redirected to /dev/null or not.
>
> I've found a method which could work:
>
>   irb $stderr.inspect
>   "#<IO:/dev/null>"
>
> So I could parse the resulting string. However it doesn't seem a very "cool" 
> approach. Is there any there any other more ellegant way?
>
> Thanks a lot.
>
>   

You can use $stderr.tty? if you just need to know if a terminal is 
listening.

-Justin