From: Alex Wayne <rubyonrails@...>
Date: 2008-04-09T04:37:03+09:00
Subject: Re: System commands with streaming output

Tim Hunter wrote:
> Alex Wayne wrote:
>> I have a long running system command that I want to print the output
>> from a ruby script.  Basically, this system command runs like a daemon
>> and prints output.  So it I just use:
>> 
>>   `./mycommand foo`
>> 
>> The output is completely supressed, and my ruby script simply appears to
>> hang.
>> 
>> So how can I execute a system command and have the output streamed back
>> to the terminal before the command finishes?
> 
> ri IO::popen

Hmm, I still can't seem to get this working.  I got this:

  IO.popen './mycommand foo' do |f|
    puts f.gets
  end

It's doing its job, but I still get no output on the terminal.  And to 
be clear, when this command is run on its own I definitely get output.
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