very simple exec usage

Hello,

I've got a number of very simple things that I'd like to monitor via snmp, 
just because the infrastructure is already there and I monitor/graph a 
number of other things via snmp.

What I'm looking at right now are some qmail queue values (deferals, 
errors, etc.).  I have a script that outputs some values and writes them 
out to a file.

In snmpd.conf I have something like this:

exec .1.3.6.1.4.1.2021.9100.1 QmailQueue1 /usr/local/adm/bin/qm-stat-cat.sh 1
exec .1.3.6.1.4.1.2021.9100.2 QmailQueue2 /usr/local/adm/bin/qm-stat-cat.sh 2
exec .1.3.6.1.4.1.2021.9100.3 QmailQueue3 /usr/local/adm/bin/qm-stat-cat.sh 3

It does work, but I'm totally lost on how to make sure these values, which 
are always integers are reported as such.

I spent many days puzzling over why mrtg just gave me empty graphs even 
though I was able to poll it:

toolbox[~]# snmpwalk -v1 -c foo h07 1.3.6.1.4.1.2021.9100.1.101.8
UCD-SNMP-MIB::ucdavis.9100.1.101.8 = STRING: "0"

Turns out that mrtg (and nagios, and probably other stuff) does not like 
to see the "STRING" type.

What am I missing here?  How does the exec method decide whether the 
returned value is a string or integer?

OTOH, the "pass" method also looks interesting.  Does anyone know of a 
link to a simple demo script made for "pass"?  I didn't see much about it 
in the net-snmp wiki.

Thanks,

Charles

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