1查看帮助。某个具体命令帮助：help column 或者 ? column；查看所有sqlplus命令。
SQL> help indexEnter 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
其内容的来源：
C:\app\Administrator\product\11.2.0\dbhome_1\sqlplus\admin\help\helpus.sql