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  1. or download this
    #
# calculate the average, avoiding any division by zero traps
#
my $avg_cpu_load = $total_cpu_load ? $total_cpu_load / $active_pid_num
+ : 0 ;
  2. or download this
    my $avg_cpu_load = $active_pid_num ? $total_cpu_load / $active_pid_num
+ : 0;