Given your example, what you want is a hash of arrays of hashes: 
my %data;

push @{$data{$linename}}, { station => $station, coords => $coords, ea
+sting => $easting, northing => $northing, elevation => $elevation };

[download]
for my $linename ( keys %data ){
  for my $entry ( @{$data{$linename}} ){
    print "$linename: @{$entry}{qw(station easting northing elevation)
+};
  }
}

[download]
At least, that's what it looks like from your example, but you really haven't given enough information about the structure of those fields.

In reply to Re^3: Data Structures by Anonymous Monk
in thread Data Structures by YYCseismic

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.