powershell.exe command fails when there is a pipe in the command using system for execution

Question

powershell.exe command fails when there is a pipe in the command using system for execution

SilverChips 71

I am trying to run a powershell command like this

std::string str = "powershell.exe -executionPolicy bypass Select-String -Path C:\\myfile.txt -Pattern \"output:\" | Select -ExpandProperty  > c:\\result.txt";

system(str.c_str());

This command fails and the reason it fails is because there is a pipe so result.txt is always empty.
Any idea why this happens and how I can fix this ?

2 answers

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Answer 1

Viorel 122.6K

Try using “^|” instead of “|” and show the results.

SilverChips 71 Reputation points

2021-02-07T10:19:02.277+00:00

I get the error A positional parameter cannot be found that accepts argument '|'.
Aurèle PETIT 0 Reputation points

2023-08-09T10:03:15.6066667+00:00

That was my solution. Was trying to add a cmd script with powershell that contains a pipe to Zabbix.
Thanks !

Answer 2

Hi,

Please check if this works

powershell.exe -executionPolicy bypass -command "& {Select-String -Path C:\\myfile.txt -Pattern \"output:\" | Select -ExpandProperty Line  > c:\\result.txt}"

Best Regards，
Ian Xue

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powershell.exe command fails when there is a pipe in the command using system for execution

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