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Hi , use Sort::External; $output = '1.txt'; open(FILE, $output); my $sortex = Sort::External->new( mem_threshold => 1024**2 * 1024 ); while (<FILE>) { $sortex->feed($_); # tried to change it to ~$_ but did not work !!!!! } use Fcntl; $sortex->finish( outfile => 'desc_1.txt', # comes in ascending order !! flags => … |