Adding new node operations for the content overview screen

Extending the list of operations available for batch processing on /admin/content is quite easy. This goes in a module called example.module

function example_node_operations() {
  $operations = array(
    'example_magic_operation_1' => array(
      'label' => t('Works magic on your nodes'),
      'callback' => 'example_operation',
      'callback arguments' => array('bulkupdate', array('message' => TRUE)),
    ),
    'example_magic_operation_2' => array(
      'label' => t('Works even more magic on your nodes'),
      'callback' => 'example_operation_2',
      'callback arguments' => array('bulkupdate', array('message' => TRUE)),
    ),
  );
  return $operations;
}

// This function gets an array of nids from what was selected
// on the /admin/content screen
function example_operation(array $nids, $op, array $options = array()) {
  foreach ($nids as $nid) {
    // Work your magic here
  }
}