why can't use this variable in my script

why can’t use this variable in my script?

i run script wiht parameter “Untitled1.ps1 -filePath C:\scripts\test01 -logPath C:\scripts” and result is

step1 C:\scripts\test01 C:\scripts

step2 C:\scripts\test01 C:\scripts

step3 “$arg2”

 

Why step3 not show result " step3 C:script

 

 

script - Untitled1.ps1

[pre]

Param

(

[CmdletBinding()]

[string]$filePath,

[string]$logPath

)

 

 

Write-Host step1 $filePath $logpath

 

function Test-Script

{

 

Param

(

[Parameter(Position=0)]

[string]$arg1,

 

[Parameter(Position=1)]

[string]$arg2

)

 

Write-Host step2 $arg1 $arg2

 

DEFINE ACTIONS AFTER AN EVENT IS DETECTED

$action = {$arg2}

Write-Host step3 $action

}

 

Test-Script $filePath $logPath

[/pre]

So if I’m reading this correctly… essentially what you’re trying to do is have a function that takes a script path and simply executes it. Or something along those lines.

If you need to read the contents of a script, you want to read it as a text file:

Get-Content -Path $FilePath

If you want to define an input string as an executable script block, you can do so like this:

$Code = [ScriptBlock]::Create()
$Code.Invoke()

If you want to log what a script is doing, though, you’re better off using Start-Transcript and Stop-Transcript

The problem is scope. Your variable is only available in the scope of the Function. First take a look at: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_scopes?view=powershell-6

This is basically what you are attempting to do:

function Test-It {
    #Scope is function only
    $myVar = "Powershell"
}

function Test-AnotherThing {
    param (
        $MyVar
    )
    "Your variable is $myVar"
}

Test-It
Test-AnotherThing

The $MyVar is only in the scope of the Test-It function, so the result is:

Test-It
Test-AnotherThing
Your variable is 

You need to understand how to pass information around in your functions. This really where you should be reading a book to understand how to build functions because there are a lot of concepts to understand. A simple fix is something like this:

function Test-It {
    #Scope is function only
    $myVar = "Powershell"
    #Return the value
    $myVar
}

function Test-AnotherThing {
    param (
        $MyVar
    )
    "Your variable is $myVar"
}

#Get the results of Test-It
$results = Test-It
#Pass the results of Test-It to Test-AnotherThing
Test-AnotherThing -MyVar $results

Output:

$results = Test-It
Test-AnotherThing -MyVar $results
Your variable is Powershell

There are other things you can do like change the variable to be global, but that is almost ALWAYS the wrong way to do things.