get return from another power shell script - powershell

Question

I have a PS script which Invoke-Expression on other scripts on the same computer.
Here is the code:
$webMemory = "C:\Memory_Script\WebMemory_Script.ps1"
$intMemory = "C:\Memory_Script\IntMemory_Script.ps1"
$hungWeb = "C:\Scripts\HungWeb_Script.ps1"
$hungInt = "C:\Scripts\HungInt_Script.ps1"
$intMemoryResult = #()
$webMemoryResult = #()
$hungWebResult = #()
$hungIntResult = #()
$date = Get-Date
$shortDate = (get-date -format ddMMyyy.hhmm)
$filepath = "C:\Scripts\Memory&HungResults\Results" + $shortdate + ".txt"
$break = "`r`n"
out-file -filepath $filepath -inputobject $date -force -encoding ASCII -width 50
out-file -filepath $filepath -Append -inputobject $break -encoding ASCII -width 50
$intMemoryResult += Invoke-Expression $intMemory
$webMemoryResult += Invoke-Expression $webMemory
$hungWebResult += Invoke-Expression $hungWeb
$hungIntResult += Invoke-Expression $hungInt
Write-host $webMemoryResult
out-file -filepath -Append -inputobject $intMemoryResult -encoding ASCII -width 200
out-file -filepath -Append -inputobject $break -encoding ASCII -width 200
out-file -filepath -Append -inputobject $webMemoryResult -encoding ASCII -width 200
out-file -filepath -Append -inputobject $break -encoding ASCII -width 200
out-file -filepath -Append -inputobject $hungIntResult -encoding ASCII -width 200
out-file -filepath -Append -inputobject $break -encoding ASCII -width 200
out-file -filepath -Append -inputobject $hungWebResult -encoding ASCII -width 200
out-file -filepath -Append -inputobject $break -encoding ASCII -width 200
Code in one of the scripts being called (the other three have similar functions)
$serverList = #("List of servers")
$w3wpMemory = #()
$w3wpMemory += "---------- W3WP Memory Consumption ----------"
$w3wpresult = #()
$toBeRecycled =#()
$toBeRecycled += "******************** THE INT SERVERS BELOW NEED TO BE RECYCLED (Hung) ********************" + "`r`n"
$date = Get-Date
$shortDate = (get-date -format ddMMyyy.hhmm)
$filepath = "C:\Scripts\HungIntResults\HungServerResults" + $shortdate + ".txt"
$break = "`r`n"
out-file -filepath $filepath -inputobject $date -force -encoding ASCII -width 50
out-file -filepath $filepath -Append -inputobject $break -encoding ASCII -width 50
ForEach($server in $serverList)
{
$w3wpresult += (get-wmiobject Win32_Process -filter "commandline like '%serviceoptimization%'" -computername $server).privatepagecount / 1gb
$w3wpMemory += $server + ":" + $w3wpresult + "`n"
}
$i = 0
ForEach($server in $serverList)
{
$w3wpresult2 = (get-wmiobject Win32_Process -filter "commandline like '%serviceoptimization%'" -computername $server).privatepagecount / 1gb
Write-Host $w3wpresult2 " , " ($w3wpresult | select-object -index $i)
if($w3wpresult -contains ($w3wpresult2))
{
$toBeRecycled += $server + "`r`n"
}
$i = $i + 1
}
$toBeRecycled += "*******************************************************************************"
$toBeRecycled += "`r`n"
Write-Host $toBeRecycled
out-file -filepath $filepath -Append -inputobject $toBeRecycled -encoding ASCII -width 100
return $toBeRecycled
When the script runs, I see the output of from the execution of the other scripts.
The results from the "Invoke-Expression" command are returning null, why is this?

Answer 1

Write-Host writes directly to the host display. If you want to capture this output then use Write-Output instead or just put a variable on a line by itself because the default output is the "output" stream:
$toBeRecycled
BTW when you execute a PowerShell script from another PowerShell script, the child script will execute synchronously (unless you are using jobs).