please help: unknown command beginning "SHUTDOWN T..."

[Quoted] [Quoted] I am getting "unknown command" message while trying to shutdown: ALTER SYSTEM CHECKPOINT;
SHUTDOWN TRANSACTIONAL;
EXIT;
/

[Quoted] [Quoted] Connecting to (ADDRESS=(PROTOCOL=IPC)(KEY=ORAC)) The command completed successfully

SQL*Plus: Release 8.0.5.0.0 - Production on Thu Jun 8 16:48:1 2000

[Quoted] [Quoted] (c) Copyright 1998 Oracle Corporation. All rights reserved.

Connected to:
Oracle8 Release 8.0.5.0.0 - Production
PL/SQL Release 8.0.5.0.0 - Production

[Quoted] System altered.

unknown command beginning "SHUTDOWN T..." - rest of line ignored. [Quoted] [Quoted] Disconnected from Oracle8 Release 8.0.5.0.0 - Production PL/SQL Release 8.0.5.0.0 - Production

SQL*Plus: Release 8.0.5.0.0 - Production on Thu Jun 8 16:49:12 2000

(c) Copyright 1998 Oracle Corporation. All rights reserved.
Received on Fri Jun 09 2000 - 00:00:00 CEST