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I want to store the stderr output of a PowerShell command in a variable. I don't want to store it in a file and I don't want standard output included, just the error output.
This redirects to a file named error.txt:
& $command $params 2> error.txt
This redirects both stderr and stdout to the $output variable:
$output = & $command $params 2>&1
But I want to store only the error output in a variable (the same as the content of the error.txt file above), without writing anything to file. How do I do that?
894
Use the try block to define a section of a script in which you want PowerShell to monitor for errors. When an error occurs within the try block, the error is first saved to the $Error automatic variable. PowerShell then searches for a catch block to handle the error.
The Get-Variable cmdlet gets the PowerShell variables in the current console. You can retrieve just the values of the variables by specifying the ValueOnly parameter, and you can filter the variables returned by name.
PowerShell Trim() methods (Trim(), TrimStart() and TrimEnd()) are used to remove the leading and trailing white spaces and the unwanted characters from the string or the raw data like CSV file, XML file, or a Text file that can be converted to the string and returns the new string.
The “$_” is said to be the pipeline variable in PowerShell. The “$_” variable is an alias to PowerShell's automatic variable named “$PSItem“. It has multiple use cases such as filtering an item or referring to any specific object.
You can call the command a slightly different way and use the -ErrorVariable parameter in PowerShell:
Invoke-Expression "$command $params" -ErrorVariable badoutput $badoutput will now contain the contents of the error string.
190
Here is simpler solution by Simon Wahlin using sub expressions
$output = & $command $params 2>&1
Would be:
$errOutput = $( $output = & $command $params ) 2>&1 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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