At the Sitecore User Group Conference 2014, I demonstrated how to invoke PowerShell scripts in a Sitecore Scheduled Task using Sitecore PowerShell Extensions, and felt I should pen what I had shown in a blog post — yes, you guessed it: this is that blog post. 😉

In my presentation, I shared the following PowerShell script with the audience:

ForEach($site in [Sitecore.Configuration.Factory]::GetSiteNames()) {
    $siteInfo = [Sitecore.Configuration.Factory]::GetSiteInfo($site)
    if($siteInfo -ne $null) {
         $siteInfo.HtmlCache.Clear()   
         $logEntry = [string]::Format("HtmlCache.Clear() invoked for {0}", $siteInfo.Name)
         Write-Log $logEntry
    }
}

The script above iterates over all sites in your Sitecore instance, clears the Html Cache for each, and creates log entries expressing the Html Cache was cleared for all sites processed.

You would probably never have to use a script like the one above. I only wrote it for demonstration purposes since I couldn’t think of a more practical example to show. If you can think of any practical examples, or feel the script above has some practicality, please share in a comment.

I wrote, tested, and saved the above script in the PowerShell ISE:

The PowerShell script was saved to a new Item created by the dialog above:

I then created a Schedule Item to invoke the script housed in the Item above (to learn more about Sitecore Scheduled Tasks, please see John West‘s post discussing them):

I saved my Item, waited a bit, and opened up my latest Sitecore log file:

As you can see, the Html Cache was cleared for each site in my Sitecore instance.

If you have any questions/comments/thoughts on this, please drop a comment.