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Gets the pending reboot status on a local or remote computer.
Gets the pending reboot status on a local or remote computer.
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)
PendFileRename = PendingFileRenameOperations (Windows 2003 / 2008)
.PARAMETER ComputerName
A single Computer or an array of computer names. The default is localhost ($env:COMPUTERNAME).
A single path to send error data to a log file.
.\Get-PendingReboot.ps1 -ComputerName (Get-Content C:\ServerList.txt) | Format-Table -AutoSize
Computer CBServicing WindowsUpdate PendFileRename 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
Computer : WKS01
CBServicing : False
WindowsUpdate : True
PendFileRename : False
RebootPending : True
This example will query the local machine for pending reboot information.
$Servers = Get-Content C:\Servers.txt
C:\PS>.\Get-PendingReboot.ps1 -Computer $Servers | Export-Csv C:\PendingRebootReport.csv -NoTypeInformation
This example will create a report that contains pending reboot information.
Component-Based Servicing:
PendingFileRename/Auto Update:
Author: Kevin Kirkpatrick
Date: 01/30/2015
PSVer: 2.0/3.0/4.0
Updated: 02/10/2015
Update Notes:
[+] Fixed an issue that wasn't properly checking 'Pending Filename Rename Operation'
[+] Renamed most of the variabled
[+] Updated some syntax formatting
[-] Removed logging parameter and associated log options
[CmdletBinding(PositionalBinding = $true)]
param (
[Parameter(Position = 0,
ValueFromPipeline = $true,
ValueFromPipelineByPropertyName = $true)]
[Alias('CN', 'Computer')]
[String[]]$ComputerName = "$env:COMPUTERNAME"
<# Adjusting ErrorActionPreference to stop on all errors, since using [Microsoft.Win32.RegistryKey]
does not have a native ErrorAction Parameter, this may need to be changed if used within another
function. #>
$defaultEAPref = $ErrorActionPreference
$ErrorActionPreference = 'Stop'
} # end BEGIN block
foreach ($computer in $ComputerName) {
try {
# Setting pending values to false to cut down on the number of else statements
[bool]$pendingFileRename = $false
[bool]$pending = $false
# Setting cbsRebootPending to null since not all versions of Windows has this value
$cbsRebootPending = $null
# Querying WMI for build version
$wmiWin32Os = Get-WmiObject -ComputerName $computer -Query 'SELECT BuildNumber,CSName FROM win32_OperatingSystem'
# Making registry connection to the local/remote computer
$regConnection = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey([Microsoft.Win32.RegistryHive]'LocalMachine', $computer)
# If Vista/2008 & Above query the CBS Reg Key
if ($wmiWin32Os.BuildNumber -ge 6001) {
$regCbsSubkey = $regConnection.OpenSubKey('SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\').GetSubKeyNames()
$cbsRebootPending = $regCbsSubkey -contains 'RebootPending'
} #End if $wmiWin32Os.BuildNumber
# Query WUAU from the registry
$regWindowsUpdate = $regConnection.OpenSubKey('SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\')
$regWindowsUpdateKeys = $regWindowsUpdate.GetSubKeyNames()
$windowsUpdateRebootPending = $regWindowsUpdateKeys -contains 'RebootRequired'
# Query PendingFileRenameOperations from the registry
$regPendingFileRename = $regConnection.OpenSubKey('SYSTEM\CurrentControlSet\Control\Session Manager\')
$regPFROQuery = $regPendingFileRename.GetValue('PendingFileRenameOperations', $null)
$regPFROValue = $regPFROQuery | Out-String
# Closing registry connection
# if any of the variables are true, set $Pending variable to $true
if ($cbsRebootPending -or $windowsUpdateRebootPending -or $pendingFileRename) {
$pending = $true
} # end if
$objPendingReboot = [PSCustomObject] @{
Computer = $wmiWin32Os.CSName
CBServicing = $cbsRebootPending
WindowsUpdate = $windowsUpdateRebootPending
PendFileRename = $pendingFileRename
RebootPending = $pending
} # end $objPendingReboot
} #End Try
Catch {
Write-Warning "[$computer][ERROR] $_"
} # End Catch
} # End Foreach ($Computer in $ComputerName)
# Resetting ErrorActionPref
$ErrorActionPreference = $defaultEAPref
} # End END block
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