From: Sebastian Hungerecker <sepp2k@...>
Date: 2007-07-20T18:34:36+09:00
Subject: Re: IO.popen - continuous output

Andy Koch wrote:
> Hi,
>
> is it possible to get a continuous output stream with IO.popen('xxx')
>
> example,
>
> IO.popen('tail -f some_log_file')...
>
> where the goal is to see the tail output as it's generating, rather than
> waiting for the process to complete to dump the generated output.

That *is* what you get with IO.popen.
For example,
IO.popen('tail -f testfile').each_line do |line|
  puts line.upcase
end
prints out the upcased version of any line added to testfile as soon as it is
added to the file.


-- 
Ist so, weil ist so
Bleibt so, weil war so