how to know whice system privileges assigned to a user

SELECT LPAD(' ', 2*level) || granted_role
"USER PRIVS"
FROM (
SELECT NULL grantee, username granted_role
FROM dba_users
WHERE username LIKE UPPER('%&uname%')
UNION
SELECT grantee, granted_role
FROM dba_role_privs
UNION
SELECT grantee, privilege
FROM dba_sys_privs)
START WITH grantee IS NULL
CONNECT BY grantee = prior granted_role;


Another one:
============

SELECT path
FROM (
SELECT grantee,
sys_connect_by_path(privilege, ':')||':'||
grantee path
FROM (
SELECT grantee, privilege, 0 role
FROM dba_sys_privs
UNION ALL
SELECT grantee, granted_role, 1 role
FROM dba_role_privs)
CONNECT BY privilege=prior grantee
START WITH role = 0)
WHERE grantee IN (
SELECT username
FROM dba_users
WHERE lock_date IS NULL
AND password != 'EXTERNAL'
AND username != 'SYS')
OR grantee='PUBLIC'
/