If you want to keep your names in the same order, since thay already seem to be sorted, then you can't depend on keys giving you back the names in sorted order. Adding a few more names to your list gives unpredictable orders. Thus you need to sort them to preserve your original order. Doing

use strict;
use warnings;

our @lines = <DATA>;
chomp @lines;

our %uniques;
@uniques{@lines} = ();

print "$_\n" for keys %uniques;

__END__
Name1
Name2
Name2
Name3
Name3
Name3
Name3
Name4
Name4
Name5
Name5
Name5
Name5
Name5
Name6
Name6
Name7
Name7
Name7
Name8
Name8
Name9
Name9
Name9

[download]

Gives

Name8
Name9
Name1
Name2
Name3
Name4
Name5
Name6
Name7

[download]

Adding a sort to the print ... line like this

print "$_\n" for sort keys %uniques;

[download]

corrects the problem (assuming your "names" are real names that sort lexically, as going on to Name10, Name11 etc sort after Name1 and before Name2).

Cheers,

JohnGG

In reply to Re: removing duplicate lines by johngg
in thread removing duplicate lines by Anonymous Monk

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