How to capture the return value of the oracle function in shell script

I have a shell script like this:

sqlplus -s $USER/$PASS << ENDSQL #1> /dev/null 2>&1
set define off
set head off
whenever sqlerror exit sql.sqlcode
select fn_get_current_date_for_region('USA') from dual; ENDSQL

I want to capture the return value of the oracle function fn_get_current_date_for_region('USA') in the shell script. How can i do this?
Thanks...

spool?