get-childitem *.jpg | 
  foreach { rename-item $_ $_.Name.Replace("bowl-", "wooden-bowl-") }


get-childitem *.jpg | 
  foreach { rename-item $_ $_.Name.Replace("wooden-bowl-", "bowl-") }




$search = 'contact@nsuok.edu'
$replace_with = 'help@nsuok.edu'
$base_dir = 'C:\Users\rosener\Desktop\Temp\html-files'
$text_file_ext = 'html'

Get-ChildItem $base_dir -Recurse -Include  "*.$text_file_ext" |
    ForEach-Object { (Get-Content $_.FullName) | 
    ForEach-Object {$_ -replace $search, $replace_with} | 
    Set-Content $_.FullName }