Using a hash sounds like a good idea. The following prints the changes for all the fields: 
#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

my @files = @ARGV;

my %people;

for my $file (@files) {
    open my $fh, '<', $file or die $!;
    <$fh>;  # Skip the header line.
    while (<$fh>) {
        chomp;
        my ($name, $job, $city, $state) = split /,\s*/;
        @{ $people{$name}{$file} }{qw{ job city state }}
            = ($job, $city, $state);
    }
}

for my $person (keys %people) {
    my $facts = $people{$person};
    my @changes;
    for my $fact (qw( job city state )) {
        push @changes, $fact
            if ($facts->{ $files[0] }{$fact} // "")
               ne ($facts->{ $files[1] }{$fact} // "");
    }
    say "$person =>",
        map {; " $_ Prev: ", $facts->{ $files[0] }{$_} // '-',
              ' Now: ', $facts->{ $files[1] }{$_} // '-'
        } @changes if @changes;
}

[download]

It's a bit tricky as it's possible to have people in one file that don't exist in the other.

Loading the input could be done via Text::CSV_XS if it's a real CSV, i.e. if the fields can get quoted or contain quoted or escaped commas etc.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: Arrary issues by choroba
in thread Arrary issues by deadlift

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.