Show connected user in Oracle SQL*PLUS command prompt

PROBLEM:
You want to see your connected user name in SQL*PLUS command prompt

SOLUTION:
You need to edit your glogin.sql file located in the following path:

oracle_home\product\11.2.0\dbhome_1\sqlplus\admin\glogin.sql

Add to the original file contents the following lines:

set serveroutput on
prompt hello!
set lines 120 pages 120
set sqlprompt '_user> '

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