Powershell Script to check if any server is pending for reboot

After the security patch, we need to validate if any of our critical server is pending for reboot and take necessary actions.PowerShell script and use it to identify servers that are pending for reboot.This will avoid the scenarios of unexpected server reboot.

 

# Filename:  CheckForPendingReboot.ps1
# Description: Imports a list of computers from a text file and then checks each of the
#    computers for the RebootPending registry key. If the key is present,
#    the script restarts the computer upon confirmation from the user.
# Assumes the existence of a file called 'Servers.txt' in the same directory, populated with
# the NETBIOS names of a list of computers, each on a new line.

 

 $computernames = gc Servers.txt

 foreach ($computername in $computernames)
 {
 $baseKey = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey("LocalMachine",$computername)
 $key = $baseKey.OpenSubKey("Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\")
 $subkeys = $key.GetSubKeyNames()
 $key.Close()
 $baseKey.Close()

 If ($subkeys | Where {$_ -eq "RebootPending"})
 {
  Write-Host "There is a pending reboot for" $computername
  Restart-Computer -ComputerName $computername -confirm
 }
 Else
 {
  Write-Host "No reboot is pending for" $computername
 }
}