I am searching for a powershell script to empty a SharePoint list, can someone give me that?
Or maybe there is an option in SharePoint / administration to empty a list with a click?
As you wish to delete all the list items, the most efficient approach is deleting the list and recreating the list,
If you wish to only empty the list without deleting it, refer below the powershell script for it,
$siteURL = "URL"
$site = new-object Microsoft.SharePoint.SPSite ( $siteURL )
$web = $site.OpenWeb()
$oList = $web.Lists["ListName"];
$collListItems = $oList.Items;
$count = $collListItems.Count -1;
for($intIndex = $count; $intIndex -ge 0; $intIndex--)
{
$collListItems[$intIndex].Delete();
}