open my $CPUFILE, "<", $file or die "Unable to open sorted file $!"; 

my @col_total;
my @col_count;
my @col_average;
while (<$CPUFILE>) {
    chomp;
    my @f = split /,/;
    shift @f;   # remove the 1st column
    my $num_cols = scalar @f;
    for my $i (0 .. $num_cols-1) {
        my $val = $f[$i];
        if ($val>0) {
           $col_count[$i]++;
           $col_total[$i] += $val;
        }
    }
}

for my $i (0 .. $#col_num) {
    $col_average[$i] = $col_total[$i]/$col_count[$i];
    print "Column ", ($i + 2), " Average = $col_average[$i]\n";
}

close $CPUFILE or die; 

my $total = 0; 
$total += $_ for @col_average; 
print "Average CPU Time for Column for all servers in cpuatest.dat file is ";
print $total/@col_average, "\n";