Bulk Update Field Values Using Sitecore Powershell Extension

BulkUpdateFieldValuesUsingSPE.ps1

$path = "master:/sitecore/content/external_forms"
$templateName = "EmailTemplate"
$emailAddresses = "test@test.com"
$fieldName = "ToEmail"

$items = Get-ChildItem -Path $path -Recurse | Where-Object { $_.TemplateName -eq $templateName }

foreach($item in $items) {
	if($item.Fields[$fieldName] -ne 'null'){
		$item.Editing.BeginEdit()
		$item.Fields[$fieldName].Value = $emailAddresses
		$item.Editing.EndEdit()
		Write-Host ($item.Name + ": " + $item.Fields[$fieldName].Value)
	}
}