snmp script

i wrote a simple script 
#!/bin/sh
echo .1.3.6.1.4.1.11821
echo integer
echo 20


i insert in snmpd.conf
pass .1.3.6.1.4.1.11821 /home/fede/snmp_script/prova


and when i do
snmpget -O n -v1 -c public localhost .1.3.6.1.4.1.11821 
is's ok .
1.3.6.1.4.1.11821 = INTEGER: 20

now, if i want add another output of my script 
e.g. echo 30, can i do?

i try 
#!/bin/sh
echo .1.3.6.1.4.1.11821
echo integer

echo 20
echo .1.3.6.1.4.1.11822
echo integer
echo 21

add on snmpd.conf
pass .
1.3.6.1.4.1.11822 /home/fede/snmp_script/prova

but 
snmpget -O n -v1 -c public 
localhost .1.3.6.1.4.1.11822
return 20 not 21

i first try with extend but snmp 
return value as a string not an integer




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