We will assume that you are using the C-shell. If you are using another shell, then this may have to be appropriately modified.
Add to your .cshrc file the following:
setenv ORACLE_HOME /local/apps/Databases/oracle_DS setenv ORACLE_SID 451F06 setenv PATH "${PATH}":/local/apps/Databases/oracle_DS/bin:"${ORACLE_HOME}"/bin
export ORACLE_HOME=/local/apps/Databases/oracle_DS export ORACLE_SID=451F06 PATH="${PATH}":/local/apps/Databases/oracle_DS/bin:"${ORACLE_HOME}"/bin