improved…

test_cst_energy.pl
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			#!/usr/bin/perl
			use strict;
			use feature "say";

			sub mean {
			my (@table) = @_;
			my $sum = 0;
			for (@table) { $sum += $_; }
			return $sum/($#table + 1);
			}

			sub variance {
			my ($mean, @table) = @_;
			my $sum = 0;
			for (@table) { $sum += ($_ - $mean)**2; }
			return $sum/($#table + 1);
			}

			my $fh;
			my @files = ();

			my $filename = shift @ARGV;
			my $tol = shift @ARGV;

			open($fh, $filename) or die "Cannot open $filename";

			my @file = <$fh>;
			my @mesure = ();
			my $nb_line = 0;
			READ: for (@file) {
			$nb_line++;
			next READ if $nb_line == 1;
			my @line = split /,/;
			$line[$#line] =~ /([+-]?[0-9]+\.?[0-9]*([eE][+-]?[0-9]+)?)/;
			push @mesure, $1;
			}

			close($fh);

			my $mean = mean(@mesure);
			my $std_devi = sqrt(variance($mean, @mesure));

			if (($std_devi/$mean <= $tol)) {
			say "Pass: Mean $mean (std devi $std_devi) -> ".($std_devi/$mean)." <= $tol";
			exit 0;
			} else {
			say "FAIL: Mean $mean (std devi $std_devi) -> ".($std_devi/$mean)." > $tol";
			exit 1;
			}