G'day FloydATC,
Perhaps something like this would be more to your liking:
$ perl -Mstrict -Mwarnings -le '
my @vlans = (2, 3, 4, 7, 10, 11, 12, 20);
my $last = $vlans[0] - 2;
my @ranges;
push @{$ranges[$#ranges + ($_ - $last > 1)]}, $last = $_ for @vlan
+s;
print join ",",
map { $_->[0] == $_->[-1] ? $_->[0] : join "-", @{$_}[0, -1] }
+ @ranges;
'
2-4,7,10-12,20
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