具体如下：

[oracle@ora11gdg1 ~]$ ls -ltr $ORACLE_HOME/sqlplus/admin | grep glogin.sql
-rw-r--r-- 1 oracle oinstall  368 Apr 10  2011 glogin.sql
[oracle@ora11gdg1 ~]$ 
[oracle@ora11gdg1 ~]$ cat $ORACLE_HOME/sqlplus/admin/glogin.sql
--
-- Copyright (c) 1988, 2011, Oracle and/or its affiliates. 
-- All rights reserved. 
--
-- NAME
--   glogin.sql
--
-- DESCRIPTION
--   SQL*Plus global login "site profile" file
--
--   Add any SQL*Plus commands here that are to be executed when a
--   user starts SQL*Plus, or uses the SQL*Plus CONNECT command.
--
-- USAGE
--   This script is automatically run
--
[oracle@ora11gdg1 ~]$ 
[oracle@ora11gdg1 ~]$ vi $ORACLE_HOME/sqlplus/admin/glogin.sql
[oracle@ora11gdg1 ~]$ cat $ORACLE_HOME/sqlplus/admin/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 --> "
[oracle@ora11gdg1 ~]$ 
[oracle@ora11gdg1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Mon Dec 26 17:13:05 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SYS@dbaplus --> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@ora11gdg1 ~]$

——————————————
Done。