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Re^3: Remove duplicate lines in a file

by RhetTbull (Curate)
on Nov 05, 2008 at 18:14 UTC ( #721755=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Remove duplicate lines in a file
in thread Remove duplicate lines in a file

I'm not sure I understand the question. I think you're asking how to print the last entry instead of the first. This code should do that:

use strict; use warnings; my $last_key = undef; my $last_line = <>; #get first line while(<>) { my $key = (split)[0]; if (defined $last_key && $key ne $last_key) { #new key, print the last line from the old key print $last_line; } $last_line = $_; $last_key = $key; } print $last_line; #very last entry won't get printed in the while loop


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