Question about RMAN-01009，RMAN-01007
Connecting to the Target Database and Recovery Catalog

The syntax will be below mention like that

rman TARGET / CATALOG rman/cat@catdb;


where 

rman is Owner of the recovery catalog having RECOVERY_CATALOG_OWNER privilege.

cat is The password for user RMAN specified in the recovery catalog's orapwd file.

catdb is The net service name for the recovery catalog database.

for your further ref Connecting to Databases with RMAN