Here's a little program I whipped up that should do about what you want. Hopefully it should be easy to modify so that you can plug it into whatever your project is. I tested it on the input you gave, but not extensively.
#/usr/bin/perl
use strict;
use warnings;
@ARGV == 2 or die "Must specify 2 files!\n";
my $afile = shift;
my $bfile = shift;
my $ahash = make_hash($afile);
my $bhash = make_hash($bfile);
sub make_hash {
my $file = shift;
my %hash = ();
open IN, "<$file" or die "Can't open '$file': $!\n";
while (<IN>) {
chomp;
my ($key,$val) = split(/,/,$_);
$hash{$key} = $val;
}
return \%hash;
}
print "In A hash but not B hash:\n",
map {"$_\n"} grep {not exists $bhash->{$_}} keys %$ahash;
print "In B hash but not A hash:\n",
map {"$_\n"} grep {not exists $ahash->{$_}} keys %$bhash;
print "In A hash and B hash but different:\n",
map {"$_\n"} grep {exists $bhash->{$_} and $ahash->{$_} ne $bhash->{$_
+}} keys %$ahash;
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