Delete oracle old entries shell script

DeleteOracle

#!/bin/bash

# Delete 1 year before today
#
# 20/02/2013 v1.0
#
#


ANO=$(date +%Y)
ANTERIOR=$[ANO-1]
FBORRADO=$(date +%d-%m-$ANTERIOR)

MES=$(date +%m)
MESANTERIOR=$[MES-1]

if [ $MESANTERIOR -lt 1 ]; then
        MESANTERIOR=12
        ANO=$ANTERIOR
fi
FBORRADO2=$(date +%d-$MESANTERIOR-$ANO)

SENTENCIA1="delete from historico where HIST_FECHAALTA < to_date('$FBORRADO','dd-mm-yy');"

sqlplus -s /nolog << EOF
set echo on
connect user/pass@dest


$SENTENCIA1

commit;

exit sql.sqlcode
EOF
exit