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  1. or download this
    sub 

...
        print "\tDid filehandle get closed: '$closed'\n";
        undef SNMP;
        print STDERR "!!!! $! \/ $? \/ $@\n";
  2. or download this
    dncms@case3 ~ 621 > perl testSnmp2.pl node
 /@/ gettable called (0)
...
END GETTABLE

What is $?: 256