Rename-Files.ps1

<#
Ok - so there's multiple ways to skin this cat.

(1) BAT File that calls this GIST into cache and runs it - just save the following as a .BAT:

    @ECHO OFF
    powershell.exe /executionpolicy bypass /command "(New-Object Net.WebClient).DownloadString('http://bit.ly/renFiles') | Invoke-Expression"
    
(2) BAT File + PS1 File...the PS1 is saved in the same folder as the BAT, BAT calls the PS1, PS1 can be edited whenever you need to adjust the FolderPath.
   - Copy the stuff starting with 'Function...' to the end. Save it somewhere as 'Rename-Files.ps1'
   - Copy the next two lines and save it as 'Rename-Files.bat':
   
     @ECHO OFF
     powershell.exe /executionpolicy bypass /command ".\Rename-Files.ps1"
     
     As long as they're in the same folder, you're golden.
#>

Function Rename-Files {
  Param (
    [Parameter(Mandatory=$true)]
    [string]$folderPath
  )

  $files = Get-ChildItem $folderPath

  $count = $files.Count

  For ($i = 0; $i -lt $count; $i++) {
    $n = $i + 1
    If ($n -lt 10) {
      $prefix = "0$($n)"
    }
    Else {
      $prefix = "$($n)"
    }

    $name = $files[$i].Name
    $newName = "$($prefix) - $($name)"

    Rename-Item $files[$i].FullName -NewName "$($newName)"
  }
}

Rename-Files -folderPath "C:\Users\1155022\Documents\-Rename"