this script... 
$| = 1;
my @data;
$#data = 8500000;
$#data = -1;
while(<>) { push @data, $_ }

print "sorting...\n";

use Sort::Key qw(ukeysort_inplace);
ukeysort_inplace { (split(/\t/))[2] } @data;

print "sorted\n";
sleep 100;

[download]
... uses 800 MB for loading the data and then 50MB more for sorting!

In reply to Re^7: Sorting a (very) large file (better*2) by salva
in thread Sorting a (very) large file by condar

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