Gerenciando o tratamento de erros ao executar o sqlplus a partir de scripts de shell

#!/bin/sh

echo "Please enter evaluate database username"
read eval_user
echo "Please enter evaluate database password"
read eval_pass
echo "Please enter the database name"
read db_name

LOGFILE=shell_log.txt

sqlplus -s /nolog <<-EOF>> ${LOGFILE}
WHENEVER OSERROR EXIT 9;
WHENEVER SQLERROR EXIT SQL.SQLCODE;
connect $eval_user/[email protected]$db_name
DBMS_OUTPUT.put_line('Connected to db');
EOF

sql_return_code=$?

if [ $sql_return_code != 0 ]
then
echo "The upgrade script failed. Please refer to the log results.txt for more information"
echo "Error code $sql_return_code"
exit 0;
fi