I am running
SELECT DBMS_METADATA.GET_DDL('TABLE','EMP') FROM DUAL;
and get to see only partial output on screen like :

DBMS_METADATA.GET_DDL('TABLE','EMP')
----------------------------------------

CREATE TABLE "SCOTT"."EMP"
( "EMPNO" NUMBER(4,0),
"ENAME" VARCHAR2(10),

SQL>
I did get the whole output once but since then it's been like shown above which I find weird!
Any ideas on how to make the whole thing appear, some variables I've tried to set are:
set pagesize 100 (& 500) - no change to the above output !!
set arraysize 100
set feedback off