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32.3. Setting Oracle Environment Variables

Make sure to set the following Oracle environment variables before you execute runInstaller.
As the oracle user, execute the following commands. Make sure to set the LD_ASSUME_KERNEL environment variable for Red Hat Enterprise Linux 3 and 4. Use the "Linuxthreads with floating stacks" implementation instead of NPTL. 
export LD_ASSUME_KERNEL=2.4.1    # for Red Hat Enterprise Linux 3
export LD_ASSUME_KERNEL=2.4.19   # for Red Hat Enterprise Linux 4
For the Oracle Environment: 
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=$ORACLE_BASE/product/9.2.0
export ORACLE_SID=test
export ORACLE_TERM=xterm
You will need to export TNS_ADMIN= Set if sqlnet.ora, tnsnames.ora and other variables are not present in $ORACLE_HOME/network/admin. 
export NLS_LANG=AMERICAN;
export ORA_NLS33=$ORACLE_HOME/ocommon/nls/admin/data
LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
export LD_LIBRARY_PATH
Set the shell search paths: 
export PATH=$PATH:$ORACLE_HOME/bin
You can add these environment settings to the end of the ~oracle/.bash_profile file if you use bash. This will ensure that the environment variables are set permanently when you log in as "oracle", or when you switch to the user "oracle" by executing "su - oracle".