What environment variables are in force when you first log in?

$ env

PATH=/usr/bin:/usr/ccs/bin:/user/config/bin

ORACLE_PATH=/u01/app/oracle/admin/dba/sql

ORACLE_HOME=/u01/app/oracle/product/9.2.0.1.0

ORACLE_SID=prod1

TNS_ADMIN=/u01/app/oracle/product/network

TERM=vt100