From: Joao Silva <rubyforum@...>
Date: 2009-02-09T09:50:55+09:00
Subject: Re: How to monitor wget command progress in ruby?

Great! I was write code:

f = IO.popen("wget http://www.hostgator.com/testfile.zip 2>&1", "r") { 
|pipe|
  pipe.each do |line|
    sleep 1.5
    puts line
  end
}

and it's almost done - it's outputs something like this:

  8350K .......... .......... .......... .......... .......... 41%  230K 
54s
  8400K .......... .......... .......... .......... .......... 41%  226K 
54s
  8450K .......... .......... .......... .......... .......... 41%  229K 
53s
  8500K .......... .......... .......... .......... .......... 41%  221K 
53s
  8550K .......... .......... .......... .......... .......... 41%  234K 
53s
  8600K .......... .......... .......... .......... .......... 42%  226K 
53s
  8650K .......... .......... .......... .......... .......... 42%  233K 
53s
  8700K .......... .......... .......... .......... .......... 42%  222K 
52s
  8750K .......... .......... .......... .......... .......... 42%  233K 
52s
  8800K .......... .......... .......... .......... .......... 43%  224K 
52s
  8850K .......... .......... .......... .......... .......... 43%  222K 
52s
  8900K .......... .......... .......... .......... .......... 43%  237K 
51s
  8950K .......... .......... .......... .......... .......... 43%  229K 
51s
  9000K .......... .......... .......... .......... .......... 44%  230K 
51s
  9050K .......... .......... .......... .......... .......... 44%  229K 
51s
  9100K .......... .......... .......... .......... .......... 44%  222K 
51s

great....but i need explaination: what does "2>&1", "r"" mean? without 
it code:

f = IO.popen("wget http://www.hostgator.com/testfile.zip", "r") { |pipe|
  pipe.each do |line|
    sleep 1.5
    puts line
  end
}

Didn't work. I would like avoid copypaste coding, i found 2>&1 in some 
tutorial.
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