Comprehensive Powershell Script for System Maintenance Mode

The script I posted yesterday was a quick and dirty script to put a windows host into maintenance mode. Problem is, that script doesn't work on agentless systems or Linux/Unix, so I took care of that. The following script will work for windows hosts, agentless hosts and linux/unix. The caveat is you have to enter the fully qualified domain name of the host. Alternatively, you could alter the script to append your DNS suffix to the host name to save some key strokes. Enjoy!

$RMSFQDN = Read-Host "Enter the FQDN of your Management Server"
$Name = "Microsoft.EnterpriseManagement.OperationsManager.Client"

$ModuleLoaded = Get-Pssnapin $Name -ErrorAction SilentlyContinue

If (-not $ModuleLoaded)
{
add-pssnapin "Microsoft.EnterpriseManagement.OperationsManager.Client";
}

New-ManagementGroupConnection -ConnectionString $RMSFQDN
Set-Location "OperationsManagerMonitoring::";

$startTime = [System.DateTime]::Now
$Hours = Read-Host "Enter the number of hours to put into maintenance:"
$endTime = $startTime.AddHours($Hours)
$comment = "Computer Maintenance"



$computerClass = get-monitoringclass -name:Microsoft.SystemCenter.ManagedComputer
$computerPrincipalName = Read-Host "Enter the FQDN computer name"
$computerCriteria = "PrincipalName='" + $computerPrincipalName + "'"
$computer = get-monitoringobject -monitoringclass:$computerClass -criteria:$computerCriteria


if($computer -eq $null)
{
$unixClass = get-monitoringclass -name "Microsoft.Unix.Computer"
$monObject = Get-MonitoringObject -monitoringclass:$unixClass
$computer = $monObject | where {$_.displayname -eq $computerPrincipalName}
}
ELSE
{
$computerClass = get-monitoringclass -name:Microsoft.Windows.Computer
$computer = get-monitoringobject -monitoringclass:$computerClass -criteria:$computerCriteria
}

if($computer.InMaintenanceMode -eq $false)
{
"Putting " + $computerPrincipalName + " into maintenance mode"
New-MaintenanceWindow -startTime:$startTime -endTime:$endTime -comment:$comment -monitoringObject:$computer
}