PowerShell - Dispose SP Objects

Question

I want to use PowerShell to loop through my SharePoint and dispose all objects properly.

I don´t want to generate entrys in the SharePoint log like this:

An SPRequest object was not disposed before the end of this thread. To avoid wasting system resources, dispose of this object or its parent (such as an SPSite or SPWeb) as soon as you are done using it. Due to flags specified at object creation, this will not be freed until processed by garbage collection.

Is the following PowerShell code ok?

$WebApps = Get-SPWebApplication

foreach($WebApp in $WebApps)
{
    $Sites = $WebApp.sites 

            foreach($Site in $Sites)
            {
                $Webs = $Site.AllWebs 

                    foreach($Web in $Webs)
                    {
                    Write-Host "Url: " $Web.url
                    $Web.Dispose()  
                    }
                $Site.Dispose()    
            } 
}
$WebApps = $Null

Answer 1

Seems like you are never even opening up any SPWeb or SPSite objects in this code, so there should be no need to dispose.

Most common cases when you need to dispose is when you use New-SPWeb or New-SPSite to be able to reach all information in and about the object. Then you should dispose, just as you do in your code example