From: Eric Hodel <drbrain@...7.net>
Date: 2008-03-25T08:50:04+09:00
Subject: Re: $stdin

On Mar 24, 2008, at 07:51 AM, Stefan Gremm wrote:
> my question is, how can i ask, if text in $stdin, without the  
> program is
> waitung for input.

Here's one way, but it isn't foolproof.

$ ruby -e 'p $stdin.tty?'
true
$ ruby -e 'p $stdin.tty?' < /dev/null
false
$ cat /dev/null | ruby -e 'p $stdin.tty?'
false