Add bulk generate URL alias via pathauto function
If you have access to your own module you can add a hook_cron function with the following code. On each cron it will execute the bulk generation for nodes
<?php
function feed_control_cron(){
//If you want to change the number of nodes to change
variable_set('pathauto_max_bulk_update', 1000);
//include the .inc files of pathauto
_pathauto_include();
//Executes the generation of URL aliases for nodes
node_pathauto_bulkupdate();
}
?>
Other solutions: http://drupal.org/node/236304
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