修改 sql 提示符信息：

Last login: Thu Dec  8 19:18:08 2016 from 192.168.242.1
[root@localhost ~]# su - oracle
[oracle@localhost ~]$ cd $ORACLE_HOME
[oracle@localhost db_1]$ cd sqlplus/
[oracle@localhost sqlplus]$ cd admin/
[oracle@localhost admin]$ cat glogin.sql
--
-- Copyright (c) 1988, 2011, Oracle and/or its affiliates. 
-- All rights reserved. 
--
-- NAME
--   glogin.sql
--
-- DESCRIPTION
--   SQL*Plus global login "site profile" file
--
--   Add any SQL*Plus commands here that are to be executed when a
--   user starts SQL*Plus, or uses the SQL*Plus CONNECT command.
--
-- USAGE
--   This script is automatically run
--
[oracle@localhost admin]$ vi glogin.sql







--
-- Copyright (c) 1988, 2011, Oracle and/or its affiliates.
-- All rights reserved.
--
-- NAME
--   glogin.sql
--
-- DESCRIPTION
--   SQL*Plus global login "site profile" file
--
--   Add any SQL*Plus commands here that are to be executed when a
--   user starts SQL*Plus, or uses the SQL*Plus CONNECT command.
--
-- USAGE
--   This script is automatically run
--



set sqlprompt "_user'@'_connect_identifier> "
~
~
~
~
~
~
~
~
~
"glogin.sql" 20L, 417C written
[oracle@localhost admin]$ sqlplus / as sysdba;

SQL*Plus: Release 11.2.0.3.0 Production on Thu Dec 8 20:49:31 2016

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SYS@orcl>

---------