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#!/usr/bin/perl -w
# vi:ts=4:sw=4
...
our $snmp = SNMP::Simple->new(%opt);

print $snmp->get($oid), "\n";

% snmpwalk -v 1 -c public localhost dskDevice.1
UCD-SNMP-MIB::dskDevice.1 = STRING: /dev/sda3
% ./snmp_get -o dskDevice.1
/dev/sda3

% snmpwalk -v 1 -c public localhost hrSystemDate.0
HOST-RESOURCES-MIB::hrSystemDate.0 = STRING: 2006-3-6,16:18:27.0,+2:0
% ./snmp_get -o hrSystemDate.0|od -t x1
0000000 07 d6 03 06 10 12 1d 00 2b 02 00 0a
0000014

-Ih    By  default, the library will use DISPLAY-HINT information when
       assigning values. This flag disables this behaviour. The result
...
         snmpset localhost HOST-RESOURCES-MIB::hrSystemDate.0 = 2002-1
+2-10,2:4:6.8
       you will have to write
         snmpset localhost HOST-RESOURCES-MIB::hrSystemData.0 x "07 D2
+ 0C 0A 02 04 06 08"