Oracle + Unix Sheel Question.

I have the following simpe shell script. I am trying to get the start time and end time of the script plus I am also calling other shell scripts in the master script. All the called scripts are supposed to initiate an oracle session and then do something...whats happening is that the Oracle session does get initiated by the called scripts but no SQL runs. I am listing the Master script and one of the called scripts below... I will appreciate all your help. I am substituting the real user name and password by the words username./password.


Master Script:
--------------------------------

${ORACLE_HOME}/bin/sqlplus <username/password> <<S_TIME
   set head off;
   set serveroutput on;
   spool start_t;
   declare
   start_time varchar2(20) :=NULL;
   begin
     SELECT to_char(sysdate,'HH24:MI:SS')
       INTO start_time
       FROM dual;
     dbms_output.put_line('Start Time: '|| start_time);
   end;
   spool off;
S_TIME


Wrapper_0.sh &
Wrapper_1.sh &
Wrapper_2.sh &
Wrapper_3.sh &
Wrapper_4.sh &
Wrapper_5.sh &
Wrapper_6.sh &
Wrapper_7.sh &
Wrapper_8.sh &
Wrapper_9.sh &
Wrapper_a.sh &
Wrapper_at.sh &
Wrapper_b.sh &
Wrapper_c.sh &
Wrapper_d.sh &
Wrapper_dot.sh &
Wrapper_e.sh &
Wrapper_f.sh &
Wrapper_g.sh &
Wrapper_h.sh &
Wrapper_i.sh &
Wrapper_j.sh &
Wrapper_k.sh &
Wrapper_l.sh &
Wrapper_m.sh &
Wrapper_minus.sh &
Wrapper_n.sh &
Wrapper_o.sh &
Wrapper_p.sh &
Wrapper_q.sh &
Wrapper_r.sh &
Wrapper_s.sh &
Wrapper_t.sh &
Wrapper_u.sh &
Wrapper_uscore.sh &
Wrapper_v.sh &
Wrapper_w.sh &
Wrapper_x.sh &
Wrapper_y.sh &
Wrapper_z.sh &

${ORACLE_HOME}/bin/sqlplus <username/password>  <<E_TIME
   set head off;
   set serveroutput on;
   spool end_t;
   declare
   end_time varchar2(20):=NULL;
   begin
     SELECT to_char(sysdate,'HH24:MI:SS')
       INTO end_time
       FROM dual;
     dbms_output.put_line('End Time: '|| end_time);
   end;
   spool off;
E_TIME

One of the called script
---------------------------------

${ORACLE_HOME}/bin/sqlplus <username/password> <<LOAD_0
declare
p_errbuf_o   varchar2(2000);
p_retcode_o  varchar2(2000);  
start_time   date;
end_time     date;
begin
start_time := sysdate;
dbms_output.put_line('Start Time: '|| to_char(start_time,'HH:MM:SS'));
xxcss_am_contract_data_sync1.xxcss_am_data_copy_id(p_errbuf_o, p_retcode_o, '0');
end_time := sysdate;                                                
dbms_output.put_line('end_time: '|| to_char(end_time,'HH:MM:SS'));
exception
when others then
dbms_output.put_line('SQLERRM: '|| SQLERRM);
end;
LOAD_0