Using more recentish functionality of Text::CSV_XS, you get quite readable code IMHO:

use Text::CSV_XS "csv";

my $hr   = csv (
    in           => "hr.txt",
    key          => "samaccountname",
    keep_headers => \my @keys,
    );

my $aoh = csv (in => "ad.txt", bom => 1, on_in => sub {
    my $sam = $_[1]{samaccountname} or die "No name in AD";
    my $ahr = $hr->{$sam};
    unless ($ahr) {
        warn "I got AD data for $sam, not in HR\n";
        next;
        }
    my @diff = map { [ $_, $ahr->{$_}, $_[1]{$_} ] }
        grep { $ahr->{$_} ne $_[1]{$_} } @keys;
    @diff or return;
    say "Changes for samaccount $sam";
    printf "  %-22s %-27.27s -> %s\n", @$_ for @diff;
    });

[download]

with the two datafiles you provided,

$ perl test.pl
Changes for samaccount barsu991
  mail                   Uttiam.Barski@pulse.org     -> William.Barski
+@pulse.org
  title                  Director of Cooks           -> Chief of Cooks
Changes for samaccount walkl003
  givenname              Lreblemet                   -> Larry
  employeenumber         20178941                    ->
  mail                   Lreblemet.Walker@pulse.org  -> Larry.Walker@p
+ulse.org
  title                  Head Cook                   -> Cook
Changes for samaccount karss001
  givenname              Sovyetk                     -> Steven
  mail                   Sovyetk.Karsten@pulse.org   -> Steven.Karsten
+@pulse.org
  title                  Dishwasher                  -> Dishw
  physicaldeliveryoffice Kitchen of the World        -> Sully's Kitche
+n
  streetaddress          205 Willy B. Temple         -> 48720 Belcard
  st                     WI                          -> IL
  postalcode             50987                       -> 34567
Changes for samaccount zingk072
  givenname              Kovon                       -> Kevin
  employeenumber         20113578                    ->
  symphonyemployeetype   IKP                         ->
  mail                   Kovon.Zingerman@pulse.org   -> Kevin.Zingerma
+n@pulse.org
  manager                cn=manager1,ou=users,ou=Kit ->
Changes for samaccount peizs194
  givenname              Synthia                     -> Samantha
  sn                     Smite                       -> Smith
  mail                   Synthia.Peizer@pulse.org    -> Samantha.Smith
+@pulse.org
  title                  Broiler Man                 -> Man, Broiler
Changes for samaccount hutcy231
  givenname              Yello                       -> Yaren
  mail                   Yello Hutchinson            -> Yaren Hutchins
+on
Changes for samaccount haserz221
  sn                     Haserkrilk                  -> Hasermann
  employeenumber         20125471                    ->
  mail                   Zebediah.Haserkrilk@kit.org -> Zebediah.Haser
+man@pulse.org
  telephonenumber                                    -> 555-555-5555

[download]

It is up to you to mold that into a report of your liking

Update: If you want to store the changes in a CSV file, change it like this:

my @diff;
my $aoh = csv (in => "ad.txt", bom => 1, on_in => sub {
    my $sam = $_[1]{samaccountname} or die "No name in AD";
    my $ahr = $hr->{$sam}           or die "I got AD data for $sam, no
+t in HR\n";
    push @diff, map { [ $sam, $_, $ahr->{$_}, $_[1]{$_} ] }
        grep { $ahr->{$_} ne $_[1]{$_} } @keys;
    });
csv (in => \@diff, out => "diff.csv");

[download]

Enjoy, Have FUN! H.Merijn

In reply to Re: Comparing two files line by line and exporting the differences from the first file by Tux
in thread Comparing two files line by line and exporting the differences from the first file by jzelkowsz

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