SQL> select '['||rpad('X', 60, 'X')||']' from dual;
'['||RPAD('X',60,'X')||']'
--------------------------------------------------------------
[XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX]
SQL> select '['||rpad('X', 80, 'X')||']' from dual;
'['||RPAD('X',80,'X')||']'
--------------------------------------------------------------------------------
[XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
SQL> set linesize 90
SQL> select '['||rpad('X', 80, 'X')||']' from dual;
'['||RPAD('X',80,'X')||']'
--------------------------------------------------------------------------------
[XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
SQL> column cmd format a90
SQL> select '['||rpad('X', 80, 'X')||']' cmd from dual;
CMD
------------------------------------------------------------------------------------------
[XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX]