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This is closely related to some FAQs: How can I tell whether a certain element is contained in a list or array? and How do I compute the difference of two arrays? How do I compute the intersection of two arrays?. The short answer is use a hash: 

#!/usr/bin/perl
use strict;
use warnings;

my @array1 = qw(a b c e);
my @array2 = qw(a b c d);

my %hash;
for my $key (@array2) {
    $hash{$key}++;
}

for my $key (@array1) {
    print "Fail: $key\n" unless $hash{$key};
}

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In reply to Re: Compare arrays by kennethk
in thread Compare arrays by japhmi

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