From: Nobuyoshi Nakada <nobu@...>
Date: 2007-08-03T11:29:12+09:00
Subject: Re: Piping two shell commands together

Hi,

At Fri, 3 Aug 2007 01:40:00 +0900,
Hans Fugal wrote in [ruby-talk:263040]:
> I want to pipe two system commands together from within ruby. cmd1 and 
> cmd2 are arrays, e.g.
> 
> cmd1 = ['oggdec','-o','-',oldpath]
> cmd2 = ['lame','-',newpath]

  IO.popen('-','r') do |p1|
    exec(*cmd1) unless p1
    IO.popen('-','w') do |p2|
      unless p2
        STDIN.reopen(p1)
        exec(*cmd2)
      end
    end
  end

-- 
Nobu Nakada