Function Get-PendingReboot{<#.SYNOPSIS    Gets the pending reboot status on a local or remote computer. .DESCRIPTION    This function will query the registry on a local or remote computer and determine if the    system is pending a reboot, from Microsoft updates, Configuration Manager Client SDK, Pending Computer     Rename, Domain Join or Pending File Rename Operations. For Windows 2008+ the function will query the     CBS registry key as another factor in determining pending reboot state.  "PendingFileRenameOperations"     and "Auto Update\RebootRequired" are observed as being consistant across Windows Server 2003 & 2008.    CBServicing = Component Based Servicing (Windows 2008+)    WindowsUpdate = Windows Update / Auto Update (Windows 2003+)    CCMClientSDK = SCCM 2012 Clients only (DetermineIfRebootPending method) otherwise $null value    PendComputerRename = Detects either a computer rename or domain join operation (Windows 2003+)    PendFileRename = PendingFileRenameOperations (Windows 2003+)    PendFileRenVal = PendingFilerenameOperations registry value; used to filter if need be, some Anti-                     Virus leverage this key for def/dat removal, giving a false positive PendingReboot .PARAMETER ComputerName    A single Computer or an array of computer names.  The default is localhost ($env:COMPUTERNAME). .PARAMETER ErrorLog    A single path to send error data to a log file. .EXAMPLE    PS C:\> Get-PendingReboot -ComputerName (Get-Content C:\ServerList.txt) | Format-Table -AutoSize    Computer CBServicing WindowsUpdate CCMClientSDK PendFileRename PendFileRenVal RebootPending    -------- ----------- ------------- ------------ -------------- -------------- -------------    DC01           False         False                       False                        False    DC02           False         False                       False                        False    FS01           False         False                       False                        False     This example will capture the contents of C:\ServerList.txt and query the pending reboot    information from the systems contained in the file and display the output in a table. The    null values are by design, since these systems do not have the SCCM 2012 client installed,    nor was the PendingFileRenameOperations value populated. .EXAMPLE    PS C:\> Get-PendingReboot    Computer           : WKS01    CBServicing        : False    WindowsUpdate      : True    CCMClient          : False    PendComputerRename : False    PendFileRename     : False    PendFileRenVal     :     RebootPending      : True    This example will query the local machine for pending reboot information..EXAMPLE    PS C:\> $Servers = Get-Content C:\Servers.txt    PS C:\> Get-PendingReboot -Computer $Servers | Export-Csv C:\PendingRebootReport.csv -NoTypeInformation    This example will create a report that contains pending reboot information. .LINK    Component-Based Servicing:    http://technet.microsoft.com/en-us/library/cc756291(v=WS.10).aspx    PendingFileRename/Auto Update:    http://support.microsoft.com/kb/2723674    http://technet.microsoft.com/en-us/library/cc960241.aspx    http://blogs.msdn.com/b/hansr/archive/2006/02/17/patchreboot.aspx     SCCM 2012/CCM_ClientSDK:    http://msdn.microsoft.com/en-us/library/jj902723.aspx .NOTES    Author:  Brian Wilhite    Email:   bcwilhite (at) live.com    Date:    29AUG2012    PSVer:   2.0/3.0/4.0/5.0    Updated: 27JUL2015    UpdNote: Added Domain Join detection to PendComputerRename, does not detect Workgroup Join/Change             Fixed Bug where a computer rename was not detected in 2008 R2 and above if a domain join occurred at the same time.             Fixed Bug where the CBServicing wasn‘t detected on Windows 10 and/or Windows Server Technical Preview (2016)             Added CCMClient property - Used with SCCM 2012 Clients only             Added ValueFromPipelineByPropertyName=$true to the ComputerName Parameter             Removed $Data variable from the PSObject - it is not needed             Bug with the way CCMClientSDK returned null value if it was false             Removed unneeded variables             Added PendFileRenVal - Contents of the PendingFileRenameOperations Reg Entry             Removed .Net Registry connection, replaced with WMI StdRegProv             Added ComputerPendingRename#>[CmdletBinding()]param(    [Parameter(Position=0,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true)]    [Alias("CN","Computer")]    [String[]]$ComputerName="$env:COMPUTERNAME",    [String]$ErrorLog    ) Begin {  }## End Begin Script BlockProcess {  Foreach ($Computer in $ComputerName) {    Try {        ## Setting pending values to false to cut down on the number of else statements        $CompPendRen,$PendFileRename,$Pending,$SCCM = $false,$false,$false,$false                                ## Setting CBSRebootPend to null since not all versions of Windows has this value        $CBSRebootPend = $null        ## Querying WMI for build version        $WMI_OS = Get-WmiObject -Class Win32_OperatingSystem -Property BuildNumber, CSName -ComputerName $Computer -ErrorAction Stop         ## Making registry connection to the local/remote computer        $HKLM = [UInt32] "0x80000002"        $WMI_Reg = [WMIClass] "\\$Computer\root\default:StdRegProv"        ## If Vista/2008 & Above query the CBS Reg Key        If ([Int32]$WMI_OS.BuildNumber -ge 6001) {            $RegSubKeysCBS = $WMI_Reg.EnumKey($HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\")            $CBSRebootPend = $RegSubKeysCBS.sNames -contains "RebootPending"                }        ## Query WUAU from the registry        $RegWUAURebootReq = $WMI_Reg.EnumKey($HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\")        $WUAURebootReq = $RegWUAURebootReq.sNames -contains "RebootRequired"        ## Query PendingFileRenameOperations from the registry        $RegSubKeySM = $WMI_Reg.GetMultiStringValue($HKLM,"SYSTEM\CurrentControlSet\Control\Session Manager\","PendingFileRenameOperations")        $RegValuePFRO = $RegSubKeySM.sValue         ## Query JoinDomain key from the registry - These keys are present if pending a reboot from a domain join operation        $Netlogon = $WMI_Reg.EnumKey($HKLM,"SYSTEM\CurrentControlSet\Services\Netlogon").sNames        $PendDomJoin = ($Netlogon -contains ‘JoinDomain‘) -or ($Netlogon -contains ‘AvoidSpnSet‘)         ## Query ComputerName and ActiveComputerName from the registry        $ActCompNm = $WMI_Reg.GetStringValue($HKLM,"SYSTEM\CurrentControlSet\Control\ComputerName\ActiveComputerName\","ComputerName")                    $CompNm = $WMI_Reg.GetStringValue($HKLM,"SYSTEM\CurrentControlSet\Control\ComputerName\ComputerName\","ComputerName")         If (($ActCompNm -ne $CompNm) -or $PendDomJoin) {            $CompPendRen = $true        }        ## If PendingFileRenameOperations has a value set $RegValuePFRO variable to $true        If ($RegValuePFRO) {            $PendFileRename = $true        }         ## Determine SCCM 2012 Client Reboot Pending Status        ## To avoid nested ‘if‘ statements and unneeded WMI calls to determine if the CCM_ClientUtilities class exist, setting EA = 0        $CCMClientSDK = $null        $CCMSplat = @{            NameSpace=‘ROOT\ccm\ClientSDK‘            Class=‘CCM_ClientUtilities‘            Name=‘DetermineIfRebootPending‘            ComputerName=$Computer            ErrorAction=‘Stop‘        }        ## Try CCMClientSDK        Try {            $CCMClientSDK = Invoke-WmiMethod @CCMSplat        } Catch [System.UnauthorizedAccessException] {            $CcmStatus = Get-Service -Name CcmExec -ComputerName $Computer -ErrorAction SilentlyContinue            If ($CcmStatus.Status -ne ‘Running‘) {                Write-Warning "$Computer`: Error - CcmExec service is not running."                $CCMClientSDK = $null            }        } Catch {            $CCMClientSDK = $null        }         If ($CCMClientSDK) {            If ($CCMClientSDK.ReturnValue -ne 0) {                Write-Warning "Error: DetermineIfRebootPending returned error code $($CCMClientSDK.ReturnValue)"                      }            If ($CCMClientSDK.IsHardRebootPending -or $CCMClientSDK.RebootPending) {                $SCCM = $true            }        }                    Else {            $SCCM = $null        }         ## Creating Custom PSObject and Select-Object Splat        $SelectSplat = @{            Property=(                ‘Computer‘,                ‘CBServicing‘,                ‘WindowsUpdate‘,                ‘CCMClientSDK‘,                ‘PendComputerRename‘,                ‘PendFileRename‘,                ‘PendFileRenVal‘,                ‘RebootPending‘            )}        New-Object -TypeName PSObject -Property @{            Computer=$WMI_OS.CSName            CBServicing=$CBSRebootPend            WindowsUpdate=$WUAURebootReq            CCMClientSDK=$SCCM            PendComputerRename=$CompPendRen            PendFileRename=$PendFileRename            PendFileRenVal=$RegValuePFRO            RebootPending=($CompPendRen -or $CBSRebootPend -or $WUAURebootReq -or $SCCM -or $PendFileRename)        } | Select-Object @SelectSplat     } Catch {        Write-Warning "$Computer`: $_"        ## If $ErrorLog, log the file to a user specified location/path        If ($ErrorLog) {            Out-File -InputObject "$Computer`,$_" -FilePath $ErrorLog -Append        }                    }              }## End Foreach ($Computer in $ComputerName)            }## End Process End {  }## End End }## End Function Get-PendingReboot