From: www-data <www-data@...>
Date: 2005-12-06T09:06:36+09:00
Subject: Re: getting stdout and stderr for system calls on windows

I have the same problem, and i'm likely going to end up using this 
syntax inside a system call:

(((dmake target | tee stdout.txt) 3>&1 1>&2 2>&3 | tee stderr.txt) 3>&1 
1>&2 2>&3) 2>&1 | tee output.txt

where output.txt will contain stderr + stdout
stdout.txt will contain stdout
stderr.txt will contain stderr

There is a description of how this works here:
http://www.cpqlinux.com/redirect.html
Scroll down to "Capturing stderr with tee Swapping stderr and stdout"
Ugly as hell but it does the trick... hopefully someone knows a cleaner 
way to do this within ruby?

--

ara.t.howard wrote:
> On Thu, 24 Nov 2005, Damphyr wrote:
> 
>> system 'echo blabla'
>> stdout.
>>
>> Cheers,
>> V.-
> 
> i was working on this at one point:
> 
>    harp:~ > cat a.rb
>    class Redirector
>      require "tempfile"
>      attr_accessor "ruby"
>      def initialize
>        @ruby = "ruby"
>        @script = tempfile
>        @script.write <<-ruby
>          stdout, stderr = ARGV.shift, ARGV.shift
>          File::unlink out rescue nil
>          File::unlink err rescue nil
>          STDOUT.reopen(open(stdout,"w"))
>          STDERR.reopen(open(stderr,"w"))
>          system(ARGV.join(' '))
>        ruby
>        @script.close
>      end
>      def run command, redirects = {}
>        stdout = redirects.values_at("stdout", :stdout, "o", :o, 
> 1).compact.first
>        tout = nil
>        unless stdout
>          tout = tempfile
>          stdout = tout.path
>        end
>        stderr = redirects.values_at("stderr", :stderr, "e", :e, 
> 2).compact.first
>        terr = nil
>        unless stderr
>          terr = tempfile
>          stderr = terr.path
>        end
>        system "#{ @ruby } #{ @script.path } #{ stdout } #{ stderr } #{ 
> command }"
>        ret = IO::read(stdout), IO::read(stderr), $?.exitstatus
>        tout.close! if tout
>        terr.close! if terr
>        ret
>      end
>      def tempfile
>        Tempfile::new(Process::pid.to_s << rand.to_s)
>      end
>    end
> 
>    redirector = Redirector::new
> 
>    stdout, stderr, exitstatus = redirector.run "echo 42"
>    p [stdout, stderr, exitstatus]
> 
>    redirector.run "echo 42", 1 => "out", 2 => "err"
>    p [IO::read("out"), IO::read("err")]
> 
> 
>    harp:~ > ruby a.rb
>    ["42\n", "", 0]
>    ["42\n", ""]
> 
> regards.
> 
> -a


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