I must be missing something here, but why use a hash structure at all? Just put your data into an array, then if you want to be able to access the array based on certain keys, create a hash indexes for just those keys:
use strict;
use warnings;
my (@data, %identifier);
while (<DATA>) {
chomp; @_ = split /\s+/, $_, 6;
push @data, [@_];
$identifier{$_[0]} = $data[-1]; # Index for first field
}
# Sort on multiple fields, in this case fifth and first...
print "@$_\n" for sort {$a->[4] cmp $b->[4] || $a->[0] <=> $b->[0]} @d
+ata;
__DATA__
1 1023 T C cc Item 1
2 1560 T C aa Item 2
3 9102 T C bb Item 3
4 11222 T C ff Item 4
7 13456 T C bb Item 7
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