resave-umbraco-media.cshtml

@using umbraco.cms.businesslogic.media
@{
    SaveMedias(Media.GetRootMedias());
}

@functions
{
    public void SaveMedias(Media[] medias)
    {
        if (medias == null || !medias.Any()) 
            return;
        
        foreach (var media in medias)
        {
            Response.Write("Saving " + media.Text + "/n");
            media.Save();
            SaveMedias(media.Children);
        }
    }
}