A hash only contains keys and values, so I'm not sure what sort of header you'd want. Perhaps printf can be of use: 
printf "%20s %s\n", "Key", "Value";
printf "%20s-%s\n", "-"x20, "-----";
foreach my $key (keys %hash) {
   printf "%20s %s\n", $key, $hash{$key};
}

[download]
If you're talking about a more complex data structure (such as a homogenous hash of hashes), perhaps something more like this would be to your liking: 
# $hash{$key} = { field1 => 'value', ... };

my @keys = keys %{$hash{(keys %hash)[0]}};
my $format = "%10s " . ("%10s " x @keys) . "\n";
printf $format, "Key", @keys;

foreach my $key (keys %hash) {
   printf $format, $key, @{$hash{$key}}{@keys};
}

[download]

In reply to Re: How do I print a hash so that it represents actual table with column headers? by Fastolfe
in thread How do I print a hash so that it represents actual table with column headers? by Anonymous Monk

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.