From: Sean O'Halpin <sean.ohalpin@...>
Date: 2006-07-28T23:18:12+09:00
Subject: Re: Catching all that goes to $stderr

On 7/28/06, Pavel Smerk <smerk@fi.muni.cz> wrote:
> Hello,
>
> how can I catch all output going to $stderr (e.g. to send some warning
> emails time to time in case of daemon etc.)?
>
> Thanks,
>
> P.
>
>
Something like this?

ioproxy = STDERR.dup

def ioproxy.write(*args, &block)
  p args
  #STDERR.write(*args, &block)  # if you want to pass it on to real STDERR
end

$stderr = ioproxy
puts "hello"
$stderr.puts "error!"
puts "world"
warn "oops!"

__END__
hello
["error!"]
["\n"]
world
["oops!"]
["\n"]

The newlines are because puts prints its args + newline. You could
easily filter that in the write method.

Regards,
Sean