PURGE Command SQL or SQL*Plus Command?

This command is in the 10G SQL documentation, it does not seem to run from command line of 9i client, but will work as a PLSQL block.

Is this the case? I need to execute this command from a script using

SQL*Plus: Release 9.2.0.4.0 - Production on Tue Dec 5 10:52:46 2006

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bit Production With the Partitioning, OLAP and Data Mining options

qa>purge recyclebin;
SP2-0734: unknown command beginning "purge recy..." - rest of line ignored.

Then I run it from 10g client.

SQL*Plus: Release 10.2.0.2.0 - Production on Tue Dec 5 10:42:34 2006

Copyright (c) 1982, 2005, Oracle. All Rights Reserved.

SQL> connect / as sysdba
Connected.
SQL> purge recyclebin;

Recyclebin purged.

Works in PLSQL Block for 10G and 9i

SQL> begin
  2 execute immediate 'purge recyclebin';   3 exception
  4 when others then
  5 dbms_output.put_line(dbms_utility.format_error_stack);   6 end;
  7 /

PL/SQL procedure successfully completed.

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