Cool. Here is a somewhat more memory-efficient alternative: 

perl -ne '$a[$h{$_}]= ""; push @a, $_; $h{$_}= $#a; END{print for @a}'
+ file

[download]

Or, if you want to cut even that memory foot-print (or does it?) roughly in half (at the cost of more CPU): 

perl -ne '$h{$_}= $.; END{print for sort {$h{$a} <=> $h{$b}} keys %h}'
+ test.txt

[download]

                - tye

In reply to Re: Remove duplicate lines maintaining last-in order (alt) by tye
in thread Remove duplicate lines maintaining last-in order by jmcnamara

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