$ cat 1.sh
#!/bin/bash
va=($(sqlplus -s system/system @/tmp/1.sql))
echo ${va[1]}
echo ${va[0]}

$ cat /tmp/1.sql
set pagesize 0 feedback off verify off heading off echo off
select 'X' from dual
union all
select 'Y' from dual;
exit;

$ ./1.sh
Y
X