From perlrun:

-0[digits]
specifies the input record separator ("$/") as an octal number...
...The special value 00 will cause Perl to slurp files in paragraph mode. ...

"Paragraph mode" is the term for what you wanted.

After Compline,
Zaxo

Thanks! I am trying to understand what really is happening. Can you point me to someplace where I can read more about this specific option ?

Click on the "perlrun" hyperlink in his reply and it will take you where you can read more about options.

When $/ is set to the null string, like this, it has the effect of using one or more blank lines as the record separator.

However, it still delimits the input records with \n\n. So in effect \n\n+ becomes \n\n. Take for instance the following input file (where $ represents a newline):

    These are the days.$
    $
    $
    $
    $
    These are the days.$
    $
    $
    $
    These are the days.$
[download]

Filtering it through the following program shows how the records are delimited:

    #!/usr/bin/perl -00n

    s/\n/\$/g;
    print "<$_>\n";

    __END__
    Prints:
    <These are the days.$$>
    <These are the days.$$>
    <These are the days.>
[download]

Some of this is explained in perlrun and some in perlvar.

--
John.

Thanks for the explanation. Very helpful.