In Oracle 10g you can run the following command to crosscheck and expire any expired archive logs:
RMAN> crosscheck archivelog all;
RMAN> delete expired archivelog all;
However in Oracle 8 and 9 you need to do the following
Example for Oracle 8 use:
RMAN> Change Archivelog All Validate;
Example for Oracle 8i use:
RMAN> change Archivelog All Crosscheck;
Example for Oracle 9i:
RMAN> crosscheck archivelog all;