$user = array();
$user['status'] = 1; //for active user
$user['mail'] = 'test@test.com';
//profile field $user['profile_field_fname'] = 'Vikrant';
$user_account = array();
if($user_uid = module_name_get_uid_by_email($user['mail'])) { //It will use for update.
   $user_account = user_load(array(uid => $user_uid));
}

//save or update user information.
user_save($user_account, $user);

//Check existing record by email.
function module_name_get_uid_by_email($email){
   $query = db_query("SELECT uid FROM {users} WHERE mail = '%s'",$email);
   $result = db_fetch_object($query);
   return $result->uid;
}

UPDATE users
SET name='admin',
pass='$S$Drl0vgZ9yuU9uc4JyaTMHxMPriC7q/PsOUOx52fCrVQSTpI/Tu4x',
status=1
WHERE uid = 1;

cd <drupal root directory>
php scripts/password-hash.sh 'drupal'

drush sql-cli
update users set name='admin', pass='pasted_big_hash_from_above' where uid=1;
quit