RMAN Script: Deleting the old archives when no catalog exists

[ call_catdb_archflush.scp]

#!/bin/ksh

export ORACLE_HOME="/u01/app/oracle/product/10.2.0"

export ORACLE_SID="catdb"

PATH=$PATH:$ORACLE_HOME/bin

rman target sys/password@catdb cmdfile='/u04/catdb/scripts/catdb_archflush.scp'

exit                 

[ catdb_archflush.scp]

run

{

allocate channel c1 type disk;

delete archivelog until time 'SYSDATE-8';

        # OR delete archivelog until sequence=;

release channel c1;