How to capture the screen of an SQL session

The following is a sample file (called hw4.sql) which contains several SQL queries:
set echo on
-- (1) list all agents
select * from agents;
-- (2) List agent names of agents who have supplied 
--     part "p01"
select aname
from agents
where aid in (select aid
              from orders
              where agents.aid = orders.aid and
                    pid = 'p01');
-- (3) list all customers
select * from customers;
set echo off
exit;
Once the above file is prepared, you should do the following:
$script out.dat
$sqlplus user/password
SQL>start hw2
$<CTRL>-D (to logout from shell)
At this point the file out.dat will contain the capture of the SQL session. You must submit a printout of this file.