Ever needed to know if a reboot is pending on your computer? Try this Microsoft/Scripting Guy PowerShell script, and you’ll know!
Copy the code below and save as .ps1 file, and execute at your convenience.
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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 either Microsoft Patching or a Software Installation. 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 / 2008) CCMClientSDK = SCCM 2012 Clients only (DetermineIfRebootPending method) otherwise $null value PendFileRename = PendingFileRenameOperations (Windows 2003 / 2008) .PARAMETER ComputerName A single Computer or an array of computer names. The default is localhost ($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 $Servers | Export-Csv C:\PendingRebootReport.csv -NoTypeInformation This example will create a report that contains pending reboot information. .LINK Component-Based Servicing: http://technet.microsoft.com/en-us/library/cc756291(v=WS.10).aspx PendingFileRename/Auto Update: http://support.microsoft.com/kb/2723674 http://technet.microsoft.com/en-us/library/cc960241.aspx http://blogs.msdn.com/b/hansr/archive/2006/02/17/patchreboot.aspx SCCM 2012/CCM_ClientSDK: http://msdn.microsoft.com/en-us/library/jj902723.aspx .NOTES Author: Brian Wilhite Email: bcwilhite (at) live.com Date: 29AUG2012 PSVer: 2.0/3.0/4.0/5.0 Updated: 01DEC2014 UpdNote: Added CCMClient property - Used with SCCM 2012 Clients only Added ValueFromPipelineByPropertyName=$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 Block Process { 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 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) { $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 |
Source: Microsoft Script Center