select username from all_users;
select username from dba_users;

function sp_grant_privileges

grant_system_privilages_template

check
-- the v$pwfile_users view contains a list of all users who have been granted the SYSDBA or SYSOPER privilege.
select * from v$pwfile_users;
-- dba-users
select * from dba_role_privs where granted_role='DBA'; 

grant
https://chartio.com/resources/tutorials/how-to-create-a-user-and-grant-permissions-in-oracle/
https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_9013.htm#SQLRF01603

?

grant execute on sys.dbms_crypto to SYSTEM with grant option;
grant execute on sys.dbms_crypto to lin_ss;

check all grants
https://stackoverflow.com/questions/1298473/how-can-i-list-all-grants-a-user-received

select privilege, admin_option from sys.dba_sys_privs where grantee = 'CB_SETUP'; --upcase is important
PRIVILEGE                                ADM
---------------------------------------- ---
CREATE JOB                               YES
QUERY REWRITE                            YES
DROP USER                                YES
CREATE TRIGGER                           YES
ANALYZE ANY                              YES
CREATE TABLESPACE                        NO 
CREATE MATERIALIZED VIEW                 YES
ALTER SESSION                            YES
CREATE ANY TRIGGER                       NO 
CREATE VIEW                              YES
CREATE ANY TABLE                         NO 
UNLIMITED TABLESPACE                     YES
ALTER SYSTEM                             YES
CREATE SEQUENCE                          YES
CREATE SESSION                           YES
SELECT ANY DICTIONARY                    YES
CREATE TABLE                             YES
CREATE USER                              YES

select privilege, granted_role, rp.admin_option, default_role from dba_role_privs rp join role_sys_privs rsp on (rp.granted_role = rsp.role) where rp.grantee = 'CB_SETUP' order by 1;
PRIVILEGE                                GRANTED_ROLE                   ADM DEF
---------------------------------------- ------------------------------ --- ---
CREATE CLUSTER                           RESOURCE                       YES YES
CREATE INDEXTYPE                         RESOURCE                       YES YES
CREATE OPERATOR                          RESOURCE                       YES YES
CREATE PROCEDURE                         RESOURCE                       YES YES
CREATE SEQUENCE                          RESOURCE                       YES YES
CREATE SESSION                           CONNECT                        YES YES
CREATE TABLE                             RESOURCE                       YES YES
CREATE TRIGGER                           RESOURCE                       YES YES
CREATE TYPE                              RESOURCE                       YES YES