How do you install the RMAN recovery catalog?

Steps to be followed:

1) Create connection string at catalog database.
2) At catalog database, create one new user or use existing user and give that user a recovery_catalog_owner privilege.
3)
Login into RMAN with connection string
    a) export ORACLE_SID=
    b) rman target catalog @connection string
4) rman> create catalog;
5) register database;