D:\app\product\11.1.0\db_1\sqlplus\admin\help>sqlplus /nolog

SQL*Plus: Release 11.1.0.7.0 - Production on Tue Oct 28 10:55:50 2014

Copyright (c) 1982, 2008, Oracle.  All rights reserved.

SQL> help

SP2-0171: HELP system not available.

SQL> connect / as sysdba

Connected.

SQL> help

 HELP

 ----

 Accesses this command line help system. Enter HELP INDEX or ? INDEX

 for a list of topics.

 You can view SQL*Plus resources at

     http://www.oracle.com/technology/tech/sql_plus/

 and the Oracle Database Library at

     http://www.oracle.com/technology/documentation/

 HELP|? [topic]

D:\app\product\11.1.0\db_1\sqlplus\admin\help>dir

 驱动器 D 中的卷没有标签。

 卷的序列号是 C2A5-4DE0

 D:\app\product\11.1.0\db_1\sqlplus\admin\help 的目录

2014/04/15  16:48    <DIR>          .

2014/04/15  16:48    <DIR>          ..

2003/03/09  23:02               278 helpbld.sql

2000/06/28  03:30               356 helpdrop.sql

2007/06/25  21:52            65,864 helpus.sql

2003/03/20  04:30             1,565 hlpbld.sql

               4 个文件         68,063 字节

               2 个目录 244,954,464,256 可用字节

SQL> conn hr/hr

Connected.

SQL> help index

Enter Help [topic] for help.

 @             COPY         PAUSE                    SHUTDOWN

 @@            DEFINE       PRINT                    SPOOL

 /             DEL          PROMPT                   SQLPLUS

 ACCEPT        DESCRIBE     QUIT                     START

 APPEND        DISCONNECT   RECOVER                  STARTUP

 ARCHIVE LOG   EDIT         REMARK                   STORE

 ATTRIBUTE     EXECUTE      REPFOOTER                TIMING

 BREAK         EXIT         REPHEADER                TTITLE

 BTITLE        GET          RESERVED WORDS (SQL)     UNDEFINE

 CHANGE        HELP         RESERVED WORDS (PL/SQL)  VARIABLE

 CLEAR         HOST         RUN                      WHENEVER OSERROR

 COLUMN        INPUT        SAVE                     WHENEVER SQLERROR

 COMPUTE       LIST         SET                      XQUERY

 CONNECT       PASSWORD     SHOW

SQL>

SQL> help @

 @ ("at" sign)

 -------------

 Runs the SQL*Plus statements in the specified script. The script can be

 called from the local file system or a web server.

 @ {url|file_name[.ext]} [arg ...]

 where url supports HTTP and FTP protocols in the form:

    http://host.domain/script.sql

 @@ (double "at" sign)

 ---------------------

 Runs the specified script. This command is almost identical to

 the @ command. It is useful for running nested scripts because it

 has the additional functionality of looking for the nested script

 in the same url or path as the calling script.

 @@ {url|file_name[.ext]} [arg ...]

SQL>