Can i write custom bulk action for my custom fields in wordpress? if yes, what are the ways to do that?

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I am working on wordpress website where i am generating Landing Pages dynamically. I have used custom fields such as price, background image etc. on these landing pages. Now i want to create a custom bulk action for those pages where I can update price field for all the landing pages at once. Now how do i create bulk action for that.

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  1. Here is a the code to begin with :

    add_action('admin_footer-edit.php', 'custom_bulk_admin_footer');
 function custom_bulk_admin_footer() {

  global $post_type;

  if($post_type == 'post') {
    ?>
    <script type="text/javascript">
      jQuery(document).ready(function() {
        jQuery('<option>').val('edit_custom_field...').text('<?php _e('Update custo....')?>').appendTo("select[name='udpate...action1']");
        jQuery('<option>').val('edit_custom_field...').text('<?php _e('Update custo....')?>').appendTo("select[name='udpate...action2']");
      });
    </script>
    <?php
  }
}



add_action('load-edit.php', 'custom_bulk_action');

function custom_bulk_action() {

  // ...

  // 1. get the action
  $wp_list_table = _get_list_table('WP_Posts_List_Table');
  $action = $wp_list_table->current_action();

  // ...

  // 2. security check
  check_admin_referer('bulk-posts');

  // ...

  switch($action) {
    // 3. Perform the action
    case 'export':
      // if we set up user permissions/capabilities, the code might look like:
      //if ( !current_user_can($post_type_object->cap->export_post, $post_id) )
      //  pp_die( __('You are not allowed to export this post.') );

      $exported = 0;

      foreach( $post_ids as $post_id ) {
        if ( !$this->perform_export($post_id) )
          wp_die( __('Error exporting post.') );
        $exported++;
      }

      // build the redirect url
      $sendback = add_query_arg( array('exported' => $exported, 'ids' => join(',', $post_ids) ), $sendback );

    break;
    default: return;
  }

  // ...

  // 4. Redirect client
  wp_redirect($sendback);

  exit();
}