PSSession和Get-Hotfix

Question

I am trying to remotely get all the patches on our servers so we know what has what. Below is the script I wrote to achieve this. However, when I execute the script I only get the patches for the local machine that is running the script. What am I doing wrong?

$computers = Get-ADComputer -Filter * -Properties operatingsystem;
$filter = "Windows Server*"

foreach($computer in $computers)
{
     if($computer.OperatingSystem -like $filter)
     {
         $name = $computer.Name.ToString();
         write-host "Working on computer: "$name
         New-PSSession -ComputerName $name;
         Enter-PSSession -ComputerName $name | Get-HotFix | Export-Csv "c:\new\$name patches.csv";
        Exit-PSSession;
     }
}

Answer 1

Enter-PSSession is only usable interactively. For scripting you need to use Invoke-Command :

$computers = Get-ADComputer -Filter * -Properties operatingsystem;
$filter = "Windows Server*"

foreach($computer in $computers)
{
  if($computer.OperatingSystem -like $filter)
   {
     $name = $computer.Name.ToString();
     write-host "Working on computer: "$name
     Invoke-Command -ScriptBlock {Get-HotFix} -ComputerName $name | 
       Export-Csv "c:\new\$name patches.csv"
  }
}