Run command on sqlplus repetitively without reconnection.

I want to run a command on sqlplus without making re-connection. At the
same time I also want to see the output. 

I can do this using UNIX but only problem is I have to make reconnection
after every interval(which I don't want)

For e.g I run following script on unix prompt

#########################################################

while true

do

sqlplus -S "/as sysdba" <<EOF

select event,count(*) from v$session group by event;

exit;

EOF

sleep 2

done

#########################################################

I want to achive same functionality without making reconnection after
every 2 secs. 

I tried to use loop,spool file and dbms_lock.sleep() but spool file does
not display output till the procedure is completed

Can anybody help to achive this functionality ?

 

regards,

Ajay
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