Hashes sound like the way forward 
open(my $cities_fh => 'cities.txt') or die "ack: $!";
my %cities;
chomp, $cities{lc substr $_, 0, 3} = $_
  while <$cities_fh>;

open(my $devices_fh => 'devices.txt') or die "ack: $!";
/^dev-([a-z]+)/ and print "$cities{$1} $_"
  while <$devices_fh>;

[download]
So create a hash with the keys as the first three letters of the city, lower-cased, and the values as the city & state name. Then iterate through the devices file grabbing the city identifier then printing out the city & state name along with the filename.
HTH

_________
broquaint

In reply to Re: Fun with arrays by broquaint
in thread Fun with arrays by blackhawk down

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.