Not quite sure what you're doing here, but assuming the log is in a file and you want to find out the highest %util value, this would do the trick (I think).

open LOG,'logfile' or die "Can't open 'logfile': $!\n";
my $max = 0;
while (<LOG>) {
    $_ = substr( $_,27,6 ); # make sure the position and length are ok
    $max = $_ if $_ > $max; # if it's not numeric, it's 0 and never mo
+re than $max
}
print "max = $max\n";
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Liz