From: Park Heesob <phasis@...>
Date: 2002-07-10T13:48:34+09:00
Subject: Re: Redirecting standard error


"Gilles Filippini" <gilles.filippini@free.fr> wrote in message
news:3D298A0E.35ECAE66@free.fr...
> Hi,
>
> I saw many examples about how to redirect standard output to - say - a
> string buffer.
> What about standard error? Has anybody already done this?
>
> _gilles.

Hi,

You can redirect standard error to file like this:

def redir(redout, rederr)
        raise unless block_given?
        oldout, olddef, olderr = $stdout.dup, $defout.dup, $stderr.dup
        begin
                f1 = File.open(redout,'w+')
                f2 = File.open(rederr,'w+')
                $stdout = f1.dup
                $defout = f1.dup
                $stderr = f2.dup
                yield
        ensure
                f1.close
                f2.close
                $stdout = oldout
                $defout = olddef
                $stderr = olderr
        end
end

redir("/tmp/stdout", "/tmp/stderr") do
  puts "hello, world!"
  `ls notexist`
end



Park Heesob