title: Error when redirecting stdout and stderr of powershell script
body: <p>The script runs fine when stdout/stderr are not redirected.</p>
  
  <p>When I add both stderr and stdout redirection, I getg the following error:
  How can I avoid it?</p>
  
  <pre><code>  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  
    0 19.4M    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
   81 19.4M    0     0   81 15.9M      0  54.5M --:--:-- --:--:-- --:--:-- 55.8M
  100 19.4M    0     0  100 19.4M      0  14.2M  0:00:01  0:00:01 --:--:-- 14.3M
  100 19.4M    0     0  100 19.4M      0  8428k  0:00:02  0:00:02 --:--:-- 8454k
  100 19.4M    0     0  100 19.4M      0  5924k  0:00:03  0:00:03 --:--:-- 5937k
  100 19.4M    0     0  100 19.4M      0  4567k  0:00:04  0:00:04 --:--:-- 4575k
  100 19.4M    0    50  100 19.4M     10  4291k  0:00:04  0:00:04 --:--:--  835k
  out-lineoutput : The OS handle's position is not what FileStream expected. Do not use a handle simu
  ltaneously in one FileStream and in Win32 code or another FileStream. This may cause data loss.
      + CategoryInfo          : NotSpecified: (:) [out-lineoutput], IOException
      + FullyQualifiedErrorId : System.IO.IOException,Microsoft.PowerShell.Commands.OutLineOutputCom 
     mand
  </code></pre>