there are many different ways in perl to sort numbers, i found those here 
 use strict;
use Data::Dumper;
#Remove duplicates from array.
my @array = qw/10 20 20 20 30 40 40 40 50 50 50/;
print "\n Duplicate array: @array";

##1) Good
my %hash;
$hash{$_} = 0 for (@array);
# $hash{$_} = () for (@array); #You can do this also

my @final = keys (%hash);
print "\n Unique Array: @final";
print "\n";


##2) Best of all
my %hash = map { $_ , 1 } @array;
my @uniq = keys %hash;
print "\n Uniq Array:", Dumper(\@uniq);

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Source: Different ways to remove duplicates from array - sort and uniq in perl

In reply to Re^2: Sorting in Perl by sandeepb
in thread Sorting in Perl by perlUser345

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