Connect to sqlplus in a shell script and run SQL scripts

Question

I have a .sql file, which is a bunch of oracle pl/sql commands and I want to create a shell script to run these commands.

Suppose that user/pass@server

Answer 1

Wouldn't something akin to this be better, security-wise?:

sqlplus -s /nolog << EOF
CONNECT admin/password;

whenever sqlerror exit sql.sqlcode;
set echo off 
set heading off

@pl_script_1.sql
@pl_script_2.sql

exit;
EOF