postgresql standby using pg_archivecleanup don't work

i have one parimary ,two standby. one standby using stream replication
connect to primary.another standby using basebackup,then recovery database
--cp archivelog from primary using crontab.i want to delete old archivelog
from standby.but configure pg_archivecleanup don't work,meantime no error in
postgresql log.postgresql version is 9.1.2.
   the following is my recovery.conf :
   This is my recovery.conf:

standby_mode = 'on'
restore_command = 'cp /attend_pg_backup/u02/pg9.1/archivelog/%f %p'
archive_cleanup_command ='pg_archivecleanup
/attend_pg_backup/u02/pg9.1/archivelog %r'



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