A minor note regarding modifying the $/ variable. While it is useful for slurping a file, it is best done with local inside a code block to minimize any possible problems later on in the script. e.g., 
{
    local undef $/;
    while (<MYINPUTFILE>) {
        ...
    }
}

[download]
That way the changes are limited to that block only. Very useful when messing with the special variables.
-----
"Ask not what you can do for your country. Ask what's for lunch."
-- Orson Welles

In reply to Re: Re Replacing duplicate string by apok
in thread Replacing duplicate string by ddrew78

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