Try starting off with module Net::SNMP, to get single values from a remote IP, probably the method $session->get_request is your best bet.. it's pretty well documented in perldoc Net::SNMP.. However you probably have to put your community in the file.. if this is undesirable, you could use module Term::ReadKey to allow "safe" reading of the password from the command line..

As far as getting the IP addresses out of a file, if they are listed one IP Address per line with nothing else included in the file itself: just read the file, put the contents in an array, then loop your SNMP get operations for each item in the array roughly something like:

open IPFILE,'<',"/tmp/ipfile.txt";
my @ip_list = <IPFILE>;
close IPFILE;

foreach my $ip_in_list ( @ip_list ) {
   ...
  ($session, $error) = Net::SNMP->session( -hostname => $ip_in_list,
        ... => ...,
        .. all other options ...;
         );

$newval = $session->get_request(
                  [-callback        => sub {},]
                  [-delay           => $seconds,]
                  [-contextengineid => $engine_id,]
                  [-contextname     => $name,]
                  -varbindlist      => \@oids,
                              );

# now do something with the data found in $newval
# use -callback to point to a subroutine where you put further operati
+ons to be carried out on $newval

}
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The above is more or less straight from the doc, and your situation is probably more complicated than that, but maybe this helps get started?