From: nobu.nokada@...
Date: 2002-09-18T17:46:12+09:00
Subject: Re: Capturing stdout from cmd while letting it print it

Hi,

At Wed, 18 Sep 2002 16:10:20 +0900,
coma_killen@fastmail.fm wrote:
> I want to capture the output from a program but still have it print to
> STDOUT.
> I tried 
> 
> r = []
> IO.popen("mycmd") do |pipe|
>   while (line = pipe.gets)
>     r << line
>     STDOUT.puts line
>   end
> end
> 
> but the output will only come after the command has finished running.
> This doesn't
> work here since the command runs for very long and the user will want
> the output.

"mycmd" may buffer and not flush the output.  How large is the
output?

Or, it may send output to stderr or console instead of stdout.

-- 
Nobu Nakada