Renames the files in a given folder

rename-folder-files.ps1

cls
$mainFolder=("C:\Users\mike-admin\Audio\pbc-2015")
$finalFolder=($mainFolder + "\wednesday\")

$lines=Get-ChildItem $finalFolder | select name

foreach ($line in $lines) {  

    $fn=$line.Name;
        
    $firstDash = $fn.IndexOf("-")
  
    $baseFileName = ('-' + $fn.Substring($firstDash+1)).ToLower()
                     
    $i=($finalFolder + $fn);          
    
    $yr = $fn.Substring(0,2)
    $mo = $fn.Substring(2,2)
    $da = $fn.Substring(4,2)
    $a = $yr.Replace("15", "2015")  
    $newFn=($a + '-' + $mo + '-' + $da + $baseFileName)

    rename-item -path $i -newname $newFn

    #Write-Output $newFn
                
}