#!/bin/sh
(for host in mithrandir; do
  echo -n "$host "
  snmpget -v1 -c public $host host.hrSystem.hrSystemUptime.0 2> /dev/null || echo ""
done) |
perl -ane '
  $F[4] =~ s/[()]//g;
  print "$F[4] $F[0]: ";
  for ($i = 0; $i < 5; $i++) {
    shift @F;
  }
  print(join(" ", @F), "\n");
' |
sort -rn |
head -1 |
cut -f 2- -d ' '