SQL>
SQL> show markup
markup HTML OFF HEAD "HTML Demo Report " BODY "" TABLE "border='1' width='90%' align='center' summary='Script output'" SPOOL ON ENTMAP ON PREFORMAT OFF
SQL> set markup
SP2-0281: markup missing set option
Usage: SET MARKUP HTML [ON|OFF] [HEAD text] [BODY text]
[TABLE text] [ENTMAP {ON|OFF}] [SPOOL {ON|OFF}] [PRE[FORMAT] {ON|OFF}]
SQL>