A powershell script to remove spaces and special char from filenames

rename.ps1

Function Rename-Files($path)
{
 Get-ChildItem -path $path | 
 Foreach-Object { 
      if($_ -is [System.IO.DirectoryInfo]) {
        echo "directory: $_"
        Rename-Files -path $_.FullName
      } else {
          $newName = $_.name -replace '[^A-Za-z0-9-_ \.\[\]]', ''
          $newName = $newName -replace ' ', '_'
          if (-not ($_.name -eq $newname)){
            echo "renaming: $_.Name  to: $newName"
            Rename-Item -Path $_.fullname -newname ($newName) 
          } 
      }
 }
} #end function

Rename-Files -path "C:\path\to\dir\"