You can use SET ECHO ON in the beginning of your script to achieve that, however, you have to specify your script using @ instead of < (also had to add EXIT at the end):
test.sql
SET ECHO ON
SELECT COUNT(1) FROM dual;
SELECT COUNT(1) FROM (SELECT 1 FROM dual UNION SELECT 2 FROM dual);
EXIT
terminal
sqlplus hr/oracle@orcl @/tmp/test.sql > /tmp/test.log
test.log
SQL>
SQL> SELECT COUNT(1) FROM dual;
COUNT(1)
----------
1
SQL>
SQL> SELECT COUNT(1) FROM (SELECT 1 FROM dual UNION SELECT 2 FROM dual);
COUNT(1)
----------
2
SQL>
SQL> EXIT