gistfile1.txt

<?php

function localdev_drush_command() {
  $items = array();

  $items['lcld'] = array(
    'description' => 'Delete nodes',
    'callback' => 'drush_lcld',
    'options' => array(
      'type' => 'node type',
    ),
  );

  return $items;
}

function drush_lcld() {
  $type = drush_get_option('type');

  if (!isset($type)) {
    drush_set_error('missing argument type', 'Pass node type to delete');
    return FALSE;
  }

  $nids = _localdev_get_nids_by_type($type);
  $count = count($nids);

  if ($count) {
    $prompt = dt("Delete !count nodes?", array("!count" => $count));
    if (drush_confirm($prompt)) {
      node_delete_multiple($nids);
    }
    else {
      drush_print("okay, not deleting");
    }
  }
}

function _localdev_get_nids_by_type($type) {
  $nids = array();
  $result = db_query('SELECT nid FROM {node} WHERE type = :type', array(':type' => $type));
  foreach ($result as $record) {
    $nids[] = $record->nid;
  }
  return $nids;
}