Question

The script is self-explanitory but I have no idea how to get it to work. I want to figure out how to pass the variable $ComputerPath to the function and in that script set $ComputerPath

Function CheckPath {
    While (!$args[0]) {
        Write-Host "`nVariable Undefined"
        $Args[0] = Read-Host "Enter Valid Path"
    } 
    while (!(test-path $Args[0])) {
        Write-Host "Unable To Location Files, Please Check Again."
        $args[0] = Read-Host "Enter Valid Path"
    }
}

$ComputersPath = "missingfile.txt"

$ComputersPath
CheckPath $ComputersPath
$ComputersPath

My Result

PS Z:\Powershell Scripting\Test Lab> .\TestFunction.ps1
missingfile.txt
Unable To Location Files, Please Check Again.
Enter Valid Path: log.txt
missingfile.txt
PS Z:\Powershell Scripting\Test Lab>

Answer 1

try pass the variabable to function like this:

CheckPath $ComputersPath

$ in single quote is see by powershell as literar ‘dollar sign’ and not a variable qualifier

And change these lines:

$args[0] = Read-Host "Enter Valid Path"
CheckPath

in

CheckPath (Read-Host "Enter Valid Path")

EDIT:

Try this:

Function CheckPath {    
    IF (!$args[0]) {    
        Write-Host
        Write-Host "Variable Undefined"
        $args[0] = Read-Host "Enter Valid Path"
    }
    else
    {
      "Found"
      $global:ComputersPath  = $args[0]
    }

IF (!(Test-Path ($Args[0]))) {
    Write-Host
    Write-Host "Unable To Location Files, Please Check Again."
    CheckPath (Read-Host "Enter Valid Path")
}

}

Edit:

To set whatever variable you use in the function I give you a example:

function test 
{   
    $myvar = $MyInvocation.line.split(' ')[1].replace('$','')    
    "`$$myvar value now is $($args[0])"

    Invoke-Expression  "`$global:$myvar = 'yahoo'"    

    "{0} value now is {1}" -f "`$$myvar", (invoke-expression "`$$myvar")
}

after you can try this:

PS C:\ps> $a="google" #or whatever variable you want...
PS C:\ps> test $a
$a value now is google
$a value now is yahoo
PS C:\ps> $a
yahoo

Now you can use the code in this function and put in your CheckPath function based on the logic of your goal