Name of the publish hook Perl script for batch transfer of files.
Can be set in: collection.cfg
workflow.publish_hook, however the script
will not be called on every file modification. Instead the script will be called sometime
after the file is modified, if it still makes sense to be called.
Although this script is called with the same arguments as
workflow.publish_hook, this script should not
be relied upon for auditing. Since it will not be called for all modifications, and
the user given to the script will not be the user that made the modification.