The following will do it:

#!/usr/bin/perl
use strict;
 
my %hash;
 
$hash{cust1}{current}[0] = 13;
$hash{cust2}{current}[0] = 110;
$hash{cust3}{current}[0] = 10;
$hash{cust4}{current}[0] = 102;
$hash{cust5}{current}[0] = 108;
$hash{cust6}{current}[0] = 130;
$hash{cust7}{current}[0] = 10;
$hash{cust8}{current}[0] = 107;
$hash{cust9}{current}[0] = 5;
$hash{cust10}{current}[0] = 210;
$hash{cust11}{current}[0] = 1;
$hash{cust12}{current}[0] = 160;
$hash{cust13}{current}[0] = 16;

my @sorted = sort { $hash{$a}->{current}->[0] <=> $hash{$b}->{current}
+->[0] } keys %hash;
print "sorted = @sorted\n";
[download]

hope this helps,

davidj