Magento 1 Customer Delete Shell Class

customer.php

<?php

require_once 'abstract.php';

class Mage_Shell_Customer extends Mage_Shell_Abstract
{

    /**
     * Run script
     *
     */
    public function run()
    {

        $collection = Mage::getModel('customer/customer')->getCollection()
           ->addAttributeToSelect('firstname')
           ->addAttributeToSelect('lastname')
           ->addAttributeToSelect('email');

        if (!$this->getArg('delete') && !$this->getArg('print')) {
            printf("ERROR: Either --delete or --print must be specified\n");
            exit(1);
        }

        if ($name = $this->getArg('firstname'))
            $collection->addAttributeToFilter('firstname', array('like' => $name));

        if ($name = $this->getArg('lastname'))
            $collection->addAttributeToFilter('lastname', array('like' => $name));

        if ($email = $this->getArg('email'))
            $collection->addAttributeToFilter('email', array('like' => $email));


        foreach ($collection as $item) {
            if ($this->getArg('delete')) {
                printf("Deleting ID:%s\n", $item->getId());
                $item->delete();
            } else {
                printf("%s\t%s\n",
                    str_pad($item->getFirstname() . $item->getLastname(), 50),
                    $item->getEmail()
                );
            }
        }

    }

    /**
     * Retrieve Usage Help Message
     *
     */
    public function usageHelp()
    {
        return <<<USAGE
Usage:  php -f customer.php -- [options]

    --firstname     Filter by first name
    --lastname      Filter by last name
    --email         Filter by email

    --delete        Delete matching users
    --print         Display matching users

USAGE;
    }

}

$customer = new Mage_Shell_Customer();
$customer->run();