In print O "@boxed"; , the elements of @boxed are printed seperated by $". By default, that is a space, so all the elements of @boxed are printed on a single line of the output file.

In @raw_data=<DAT>; , the record seperator is $/ which is the system line end by default. You will find 'Bucket Man' in $raw_data[0], along with all the rest.

See perlvar for information on $", $/, $\, $, , and friends.

(Added) You can do what you want by replacing print O "@boxed"; with 

{
    local $, = $/;
    print O @boxed;
}

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After Compline,
Zaxo

In reply to Re: Annoying array. by Zaxo
in thread Annoying array. by nasa

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