I, also, think the specification is not exact, but I take it to be "uniqify all elements of @arr2 that also exist in @arr1". If that's the case, something like this might work: 
perl -wMstrict -le
"my @arr1 = qw(one two three four five);
 my @arr2 = qw(one a b one c d e two f g h two i j two);
 my %seen1 = map { $_ => 0 } @arr1;
 @arr2 = grep { ! exists $seen1{$_} or ! $seen1{$_}++ } @arr2;
 print qq(@arr2);
"
one a b c d e two f g h i j

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In reply to Re: Comparing arrays in perl. by Anonymous Monk
in thread Comparing arrays in perl. by anand_perl

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