powershell - get return from another power shell script -

i have ps script invoke-expression on other scripts on same computer. here 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 1 of scripts being called (the other 3 have similar functions)

$serverlist = @("list of servers")  $w3wpmemory = @() $w3wpmemory += "---------- w3wp memory consumption ----------" $w3wpresult = @() $toberecycled =@() $toberecycled += "******************** int servers below need 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 '%serviceoptimization%'" -computername $server).privatepagecount / 1gb $w3wpmemory += $server + ":" + $w3wpresult + "`n"  }      $i = 0 foreach($server in $serverlist) {     $w3wpresult2 = (get-wmiobject win32_process -filter "commandline '%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 script runs, see output of execution of other scripts. results "invoke-expression" command returning null, why this?

write-host writes directly host display. if want capture output use write-output instead or put variable on line because default output "output" stream:

$toberecycled 

btw when execute powershell script powershell script, child script execute synchronously (unless using jobs).