From: Rob Biedenharn <Rob@...>
Date: 2008-06-01T04:09:26+09:00
Subject: Re: getting standard error and output from ruby script in real time

On May 31, 2008, at 12:16 PM, Stefano Crocco wrote:

> On Saturday 31 May 2008, Rob Biedenharn wrote:
>
>> $stdout.sync = true; $stdout.flush
>>
>> The #sync setting of true means "unbuffered" (sync'd to the
>> destination every time).  If you build up messages, you can call
>> #flush on the IO yourself instead.
>>
>> print "hello "
>> print "world"
>> puts "!"
>> STDOUT.flush
>
> I don't think that would work. If I understand correctly what you  
> mean, that
> should be put in the script which produces the output, not not in  
> the one
> displaying it. But since the output I want to display is from a  
> script written
> by the user, I can't do that.
>
> Stefano


If you have no need to maintain separate streams do the equivalent of  
the shell's:

  2>&1

so that stderr is the same as stdout.

  $stderr.reopen($stdout)


You might want to do that in your child process before exec'ing the  
user's script.

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com