From: Bruce Woodward <bruce.woodward@...>
Date: 2007-04-06T16:00:01+09:00
Subject: Re: A convoluted question about stdout

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On 4/6/07, Sonny Chee <sonny.chee@gmail.com> wrote:
>
> Hey Guys,
>
> I know I can do a $stdout.reopen and redirect it to a file.  Is there a
> more direct way to get at the contents of stdout... say, redirect stdout
> to variable?
>
>
#!/usr/bin/env ruby

old_std_out = $stdout
$stdout = File.open("/tmp/file", "w+")

puts "where does the output go?"
bruce@carlpowerbook:~/tmp$ rm -f /tmp/file
bruce@carlpowerbook:~/tmp$ ./r.rb
bruce@carlpowerbook:~/tmp$ cat /tmp/file
where does the output go?
bruce@carlpowerbook:~/tmp$

or, with build in clean up...

bruce@carlpowerbook:~/tmp$ rm -f /tmp/file
bruce@carlpowerbook:~/tmp$ cat r.rb
#!/usr/bin/env ruby

def with_stdout(file_name)
  old_stdout = $stdout
  $stdout = File.open(file_name, "w+")
  yield
  $stdout = old_stdout
end

with_stdout "/tmp/file" do
  puts "where does the output go?"
end

puts "and where is stdout now?"
bruce@carlpowerbook:~/tmp$ ./r.rb
and where is stdout now?
bruce@carlpowerbook:~/tmp$ cat /tmp/file
where does the output go?

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