shell script to execute .sql script

Hi I am trying to execute a shell script under root on linux to execute a sql script which create schema tables on oracle 8i.

ORA_HOME=/u01/app/oracle/product/8.1.7
ORA_OWNER=oracle
su - $ORA_OWNER -c "$ORA_HOME/bin/sqlplus username/password@orasid @/usr/local/createtables.sql"
exit

but i am getting command not found error.

Am i doing right ? please help.

Thanx
Kulkarni

su - makes you read user´s profile, obviously ORA_HOME is not an Oracle user´s environment variable