使用 PowerShell 變更 SharePoint 的 MasterPage

$customMasterPage="/_catalogs/masterpage/nightandday.master"
$site=get-SpSite "<-Url>"
$web=$site.RootWeb
$masterUri=New-Object System.Uri($web.Url+$customMasterPage)
$web.MasterUrl=$masterUri.AbsolutePath
$web.CustomMasterUrl=$masterUri.AbsolutePath
$web.Update()
$web.Dispose()
$site.Dispose()