No worries, you just need to reverse the test that decides which lines to print. One way is to change the if statement to an "unless" statement.

        print "$_\n" unless exists $ids{$id};

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In reply to Re^3: Perl: How to print unmatched data after comparison of two files? by Loops
in thread Perl: How to print unmatched data after comparison of two files? by WWq

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