Rename all files and folders to lower case

For the files....

Get-ChildItem -recurse |
    Where {-Not $_.PSIsContainer} |
    Rename-Item -NewName {
        $_.FullName.ToLowerInvariant()
    }

For the folders....

#Get the directories / sub directories and rename to lowercase
Get-ChildItem -recurse |
    ?{ $_.PSIsContainer -And $_.Name -CMatch "[A-Z]" } |
    %{
        $NName = $_.Name.ToLowerInvariant()

        # Set temporary name to enable rename to the same name; Windows is not case sensitive
        $TempItem = Rename-Item -Path $_.FullName -NewName "x$NName" -PassThru

        Rename-Item -Path $TempItem.FullName -NewName $NName
    }

Source

• script from stuartfromnz