Substring

PowerShell example to edit multiple files. This specific example remove the first 15 chars from every XML file in a directory.

get-childitem D:TEMPMessages *.xml |
  % { 
         [string]$sFileContent = cat $_.fullname
         $sFileContent = $sFileContent.substring(15,$sFileContent.length-15) | Out-File -Filepath $_.fullname
         echo $_.fullname
  }