SharePoint 2010 PoweShell Update Site CSS and Logo

Are you moving from one environment to another? Or just have to change the css and site logo for a large SharePoint farm, with many top Level Site Collections. I had this happen to me about 2 weeks ago. I had to update the Top Level Sites Collections CSS, and Logo URL for 35 sites. Come in PowerShell! PowerShell is a great administration tool that can help you automate and stream line your task. I used the following script to accomplish the task I needed.

Add-PSSnapin microsoft.sharepoint.powershell -ErrorAction SilentlyContinue
$WA = Get-SPWebApplication "Web Application URL"
$Sites = $WA.Sites

foreach($Site in $Sites)
{
        foreach($web in $site.AllWebs)
        {
            Write-Host  $web.Url  "   CSS URL: "   $web.AlternateCssUrl
            
            Write-Host  $web.Url  "   Logo URL: "   $web.SiteLogoUrl
            
            $web.AlternateCssUrl = "New CSS URL"
            $web.SiteLogoUrl = "NEW Logo URL"
            $web.Update() 
            Write-Host "updated: "  $web.Url
        }
}