This is the text description of the syntax diagram for the RMAN show construct.
SHOW {ALL | ARCHIVELOG {BACKUP COPIES | DELETION POLICY} | AUXNAME | BACKUP OPTIMIZATION | [AUXILIARY] CHANNEL [FOR DEVICE TYPE [=] deviceSpecifier] | CONTROLFILE AUTOBACKUP [FORMAT] | DATAFILE BACKUP COPIES | [DEFAULT] DEVICE TYPE | ENCRYPTION {ALGORITHM | FOR {DATABASE | TABLESPACE}} | EXCLUDE | MAXSETSIZE | RETENTION POLICY | SNAPSHOT CONTROLFILE NAME}
Elements in the diagram are described in the discussion that follows the diagram.