gistfile1.txt

Add-PSSnapin WebAdministration

$sites = ls IIS:\Sites 

foreach ($site in $sites) {  
   $debug = Get-WebConfigurationProperty -filter system.web/compilation -name debug -PSPath $site.PSPath
   if ($debug.Value) {
     Set-WebConfigurationProperty -filter system.web/compilation -name debug -PSPath $site.PSPath -value false
     echo $site.Name
   }
}