Adding existing backups to RMAN catalog

RMAN> CATALOG DATAFILECOPY '/u01/backup/system01.dbf'

RMAN> CATALOG ARCHIVELOG '/u01/backup/arch_1.arc', '/u01/backup/arch_2.arc';

RMAN> CATALOG BACKUPPIECE '/u01/backup/backup_001.bkp'; -- FOR EACH BACKUP PIECE IN THE BACKUP SET !!!

RMAN> CATALOG START WITH '/u01/backup/'; -- Check for the trailing backslash !!!