sub print_usage {
print <<_USAGE_;
-$0: Removes unused authorities.
+$0: Remove unused authority records
+
+This script removes authority records that do not have any biblio
+records attached to them.
+
+If the --aut option is supplied, only authority records of that
+particular type will be checked for usage. --aut can be repeated.
+
+If --aut is not supplied, all authority records will be checked.
+
+Use --test to perform a test run. This script does not ask the
+operator to confirm the deletion of each authority record.
-This script will parse all authoritiestypes (or only those given as parameter), and remove authorities without any biblio attached.
-warning : there is no individual confirmation !
parameters
--aut|authtypecode TYPE the list of authtypes to check
--test or -t test mode, don't delete really, just count