Oracle: SQL*Plus init scripts

There are two scripts that you can muck with to modify the Oracle SQL*Plus environment.

1. glogin.sql
   1. Located in: ${ORACLE_HOME}/sqlplus/admin/gloign.sql
   2. Affects all Oracle users.
2. login.sql:
   1. Located either in the current directory or in the directories listed in ${SQLPATH}
   2. Affects only the current user.