Applying/Change the CustomMasterUrl and MasterUrl in master page setting in SharePoint using PowerShell

Provide the URL in $webAppUrl and Below is the code details:-

param($webAppUrl)

[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Sharepoint")

[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Sharepoint.Administration")

 

$site=New-Object Microsoft.SharePoint.SPSite($webAppUrl)

$web = $site.openweb();

$web.AllowUnsafeUpdates=$true;

$MasterPageURL="/_catalogs/masterpage/XYZ_publishing.master"

$web.CustomMasterUrl=$MasterPageURL

$web.MasterUrl=$MasterPageURL

$web.Update()

$web.AllowUnsafeUpdates=$false;

$outputText = "XYZ publishing master page is applying in "+ $web.Name +" site."

write-output $outputText

                                

$web.Dispose()

$site.Dispose()