pipe not working | PowerShell | Page 1

hasty verge Feb 18, 2025, 1:58 PM

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With the following command, I can retrieve the output in the temp file :
Start-Process powershell -Verb runAs -ArgumentList "C:\Users\Florian\Documents\Test\script.ps1 -Install *> $Env:TEMP\temp_python_output.txt"

But not with this one :
Start-Process powershell -Verb runAs -ArgumentList "C:\Users\Florian\Documents\Test\script.ps1 -Install | Out-File -FilePath $Env:TEMP\temp_python_output.txt"

plush flower Feb 18, 2025, 2:09 PM

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right, that's expected. are you asking why?

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https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_powershell_exe?view=powershell-5.1#:~:text=All values typed after the File parameter are interpreted as the script filepath and parameters passed to that script.

about_PowerShell_exe - PowerShell

Explains how to use the powershell.exe command-line interface. Displays the command-line parameters and describes the syntax.

hasty verge Feb 18, 2025, 2:33 PM

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plush flower right, that's expected. are you asking why?

Yes, is it linked to pipe or something else ?

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When i check the doc, I use it in the right way

https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/out-file?view=powershell-7.5

Out-File (Microsoft.PowerShell.Utility) - PowerShell

The Out-File cmdlet sends output to a file. It implicitly uses PowerShell's formatting system to write to the file. The file receives the same display representation as the terminal. This means that the output may not be ideal for programmatic processing unless all input objects are strings. Redirecting the output of a PowerShell command (cmdlet...

tiny hawk Feb 18, 2025, 2:37 PM

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What does script.ps1 contain?

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| won't capture error output

hasty verge Feb 18, 2025, 2:40 PM

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The script runs correctly, but I can't get its output with Out-File

tiny hawk Feb 18, 2025, 2:45 PM

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Looks like the script is printing directly to screen with Write-Host or similar

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That also won't be picked up by the pipeline

hasty verge Feb 18, 2025, 2:47 PM

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Thanks, I thought it would work

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I guess that i'll use *> instead if pipes

tiny hawk Feb 18, 2025, 2:49 PM

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FWIW you don't need to escape \ in PowerShell-native contexts , it's just -FilePath $env:TEMP\temp_python_output.txt

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You can also invoke powershell inline if you don't mind it blocking the thread, Start-Process isn't necessary:

powershell.exe -File C:\Users\Florian\Documents\Test\script.ps1 *> $env:TEMP\temp_python_output.txt

hasty verge Feb 18, 2025, 2:54 PM

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I use start process to run an administrator powershell because python initially executes command in a cmd. The full command is

powershell -Command "Start-Process powershell -Verb runAs -ArgumentList ..."

vital gate Feb 18, 2025, 7:54 PM

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because python initially executes command in a cmd
Are you doing multiple layers of indirection mainly because you don't want to see a visible window when you call python?
If yes, there's probably better options

#pipe not working