One way (perhaps a little brute-force) is to step through one of the hashes, and deleting entries from both hashes that match. When the dust settles, you'll have all the people in each hash that are not in the other hash. Try something like this (untested) snippet:

foreach (keys %firsthash) {
  if (exists($secondhash{$_})) {
    delete($firsthash{$_};
    delete($secondhash{$_};
  }
}

[download]

No good deed goes unpunished. -- (attributed to) Oscar Wilde

In reply to Re: Need advice on hashes and methods by ptum
in thread Need advice on hashes and methods by tom2112

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.