Error when redirecting stdout and stderr of powershell script

Question

The script runs fine when stdout/stderr are not redirected.

When I add both stderr and stdout redirection, I getg the following error: How can I avoid it?

 % 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

What does your code look like?

JasonMArcher
– JasonMArcher

2009-09-14 23:17:34 +00:00
Commented Sep 14, 2009 at 23:17 — JasonMArcher
– JasonMArcher, Commented Sep 14, 2009 at 23:17

x0n · Accepted Answer · 2009-09-14 16:13:55Z

15

Lee Holmes (one of the senior developers on the powershell team) covers this here in a blog post:

http://www.leeholmes.com/blog/WorkaroundTheOSHandlesPositionIsNotWhatFileStreamExpected.aspx

This is bug in PowerShell v1.0, and happens when:

a PowerShell command generates both regular and error output
you have used cmd.exe to redirect the output to a file
you have used cmd.exe to merge the output and error streams

There is a workaround.

-Oisin

answered Sep 14, 2009 at 16:13

x0n

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6 Comments

ripper234 Over a year ago

Thanks for the article. I tried both workaround (V1 and V2 CTP) and it doesn't work ("You cannot call a method on a null-valued expression.")

x0n Over a year ago

What version are you using? You don't say in your original question.

bernd_k Over a year ago

Well I think I'm using V2 today and I wonder if i see it in V3 too.

Ruben Bartelink Over a year ago

@bernd_k According to an update on the cited post, it's sorted for Windows 8. I still can't believe we're going to have to struggle on with it in V2 for another 10 years. Grr.

w128 Over a year ago

The link in the answer is no longer available. Is the workaround available anywhere else?

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JoshDM · Accepted Answer · 2012-12-31 18:39:54Z

I once had several hard-linked junctions at directory that needed to have "GetItemChild" applied, and received the same error as this question.

Removing the junctions solved the problem.

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