PowerShell Tee-object command doesn't work on git pull

Question

The following powershell command works as expected:

get-process | tee-object -filepath C:\Test1\testfile2.txt

But if I change it to:

git pull | tee-object -filepath C:\Test1\testfile2.txt

I see the git pull command execute normally but C:\Test1\testfile2.txt still has the output from get-process.

Any idea why?

I see: gm : You must specify an object for the Get-Member cmdlet. At line:1 char:12 + git pull | gm + ~~ + CategoryInfo : CloseError: (:) [Get-Member], InvalidOperationException + FullyQualifiedErrorId : NoObjectInGetMember,Microsoft.PowerShell.Commands.GetMemberCommand — Eric, May 16 '17 at 16:43
git isn't a cmdlet and so doesn't expose objects to the pipeline. Normal output from .exe programs to standardout should be piped and handled properly by Tee-Object. Maybe git output is to stderror, so try git pull 2>&1 | tee-object -filepath C:\Test1\testfile2.txt — LotPings, May 16 '17 at 18:22

LotPings · Accepted Answer · 2017-05-16 20:55:42Z

3

In cmd.exe there are two output streams, stdoutput and stderroroutput numbered 1 and 2.
Batch/console prepends 1 to a redirection > if not a different stream number is supplied manually.
Looks like git outputs to stderroroutput, so 2>&1 merges stderroroutput(2) with stdoutput(1) so it is piped and tee is able to echo and store to the file.
In powershell there are additional streams, see powershell streams

answered May 16 '17 at 20:50

LotPings

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