my @in = qw/
    test
    foo
    test
    bar
    baz
    foo
    test
/;

my %multiples;
for (@in) {
  $multiples{$_}++;
}
for keys( %multiples ) { 
  print "$_\n" if (--$multiples{$_});
}

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In reply to Re: Get All Duplicated Elements in an Array (Once, without shifting) by ehdonhon
in thread Get All Duplicated Elements in an Array (Once, without shifting) by George_Sherston

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