Re: Sorting Hash / Array

[kcott]

Here's one way of doing it.

#!/usr/bin/env perl

use strict;
use warnings;

my $VAR1 = {
    '127' => {
        'network' => '10.182.48.0/24',
        'VLAN' => '3509'
    },
    '32' => {
        'network' => '10.182.12.0/25',
        'VLAN' => '2121'
    },
    '90' => {
        'network' => '10.183.243.128/25',
        'VLAN' => '3494'
    }
};

my @sorted_keys
    = sort { $VAR1->{$a}{network} cmp $VAR1->{$b}{network} } keys %$VA
+R1;

print qq{Key\tNetwork\t\t\tVLAN\n};
for my $key (@sorted_keys) {
    print qq{$key\t}, $VAR1->{$key}{network}, qq{\t\t},
            $VAR1->{$key}{VLAN}, qq{\n};
}

Here's the output:

$ pm_sort_hash_array.pl
Key    Network                VLAN
32     10.182.12.0/25        2121
127    10.182.48.0/24        3509
90     10.183.243.128/25     3494

[johngg]

What happens if you add another network to the hashref with the address 10.19,72.0/25? That will sort lexically after the others even though in numerical network order it should come first!

You need to convert the address (excluding the netmask) into something that will produce the right result when sorting lexically. The Socket module provides inet_aton() to achieve this.