How to permanent delete unused files in Drupal 8?

Drupal 8, we can programmatically delete our unused files(assets) easily. we just have to write the code in custom module file in `hook_cron` function. After put the code and clear the cache whenever you hit the cron manually or automatically will run this code will execute.

Code:

/**

 * override hook_cron()

 */

function mymodule_cron()  // mymodule will replace with module name

{

  // get all files ids

  $fids = Drupal::entityQuery('file')->execute();

  $file_usage = Drupal::service('file.usage');

  // loop all fids and load files by fid

  foreach ($fids as $fid) {

    $file = Drupal\file\Entity\File::load($fid);

    $usage = $file_usage->listUsage($file);

    // check if file not used

    if (count($usage) == 0) {

      $file->delete();

    }

  }

}

Note: If have any suggestions or issue regarding 'How to permanent delete unused files in Drupal 8?' then you can ask by comments. 

How to node load by name in drupal 8?

In drupal 8, we have easy way to node load by name/title. We can use "loadByProperties" function for node/user/file data.
here we are going to give an example with 3 type of entity.

Syntax 1:
$title = 'dummy';
//node load by name/title
$node_data = \Drupal::entityTypeManager()
        ->getStorage('node')
        ->loadByProperties(['title' => $title]); 
 OR

$result = \Drupal::entityQuery("node")
                ->condition('type', 'resources') // put your content type here
                ->condition('title', $title) // pass the title value or take any other condition
                ->execute();
               
Syntax 2:               
$email = 'dummymailid@gmail.com';
//load user by email id
$user_data = \Drupal::entityTypeManager()
           ->getStorage('user')
           ->loadByProperties(['mail'=> $email]); // here we can use any other property/field

          
Syntax 3:
$filr_uri = 'dummy file uri';          
//load file by uri
$file_data = \Drupal::entityTypeManager()
           ->getStorage('file')
           ->loadByProperties(['uri' => $file_uri]); // here we can use any other field


Note: How to node load by name in drupal 8?