declare variable over Sessions

Question

I start a PowerShell script that calls a function with Invoke-Command on another computer. I want to declare a variable that is available over all this sessions.

$var = "global"

function do-function{
    $var = "function"
    return $var
}

$var
invoke-command -ComputerName NameOfComputer -scriptblock  ${function:do-function}
$var

output:

global
function
global

My target is to get:

global
function
function

Answer 1

You have to assign the return value from the Invoke-Command cmdlet to the variable:

$var = "global"

function do-function{
    $var = "function"
    return $var
}

$var
$var = invoke-command -ComputerName NameOfComputer -scriptblock  ${function:do-function}
$var

Also, a scriptblock can be defined as follow:

$myScriptBlock = {
    # ....
}

invoke-command -ComputerName NameOfComputer -scriptblock $myScriptBlock