Send result from called powershell script to a calling powershell script

Question

I'm trying to send just the result I want from a called PowerShell script back to the calling script.

So the script testcaller.ps1

$Result = Invoke-Expression "$PSScriptRoot\testcalled"
$LogMessage = "TestCalled ended with Result $Result"
Write-Output $LogMessage

Calls the script testcalled.ps1

$TestMessage = "this is a test"
Write-Output $TestMessage
$Level = 1
exit $Level

When run it produces this...

TestCalled ended with Result this is a test 0

I have two problems. I get the testmessage passed back to my calling script and the level past back is 0 when it should be 1. What I want to see is...

TestCalled ended with Result 1

you can try to use return: $TestMessage = "this is a test" $Level = 1 return $TestMessage, $Level — Miroslav Vasilev
– Miroslav Vasilev, Commented Nov 18, 2021 at 19:14

Santiago Squarzon · Accepted Answer · 2021-11-18 19:46:26Z

Given testcalled.ps1

'hello world'
function Say-Hello { 'hello!' }
exit 1

If you want to run this external script from another script you can either dot source it:

The functions, variables, aliases, and drives that the script creates are created in the scope in which you are working. After the script runs, you can use the created items and access their values in your session.

$Result = . "$PSScriptRoot\testcalled.ps1"
$Result       # => hello world
Say-Hello     # => 'hello!'
$LASTEXITCODE # => 1

Or use the call operator &:

The call operator executes in a child scope.

Meaning that, functions, variables, aliases, and drives will not be available on the current scope.

$Result = & "$PSScriptRoot\testcalled.ps1"
$Result       # => hello world
Say-Hello     # => SayHello: The term 'SayHello' is not recognized as a name of a cmdlet, function....
$LASTEXITCODE # => 1

As you can see, on both cases, you can use the automatic variable $LASTEXITCODE.

Last, but not least, it is not recommended to use Invoke-Expression. See https://devblogs.microsoft.com/powershell/invoke-expression-considered-harmful/

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