diff --git a/tools/diag/ac/cknames.pl b/tools/diag/ac/cknames.pl
new file mode 100644
index 000000000000..41083d74c013
--- /dev/null
+++ b/tools/diag/ac/cknames.pl
@@ -0,0 +1,68 @@
+#!/usr/bin/perl -w
+# Copyright (c) 2002 Alexey Zelkin <phantom@FreeBSD.org>
+#
+# cknames.pl -- this scripts checks for existence persons listed
+#               in authors.ent and access files
+#
+# $FreeBSD$
+#
+
+$debug = 0;
+$accessfile = "CVSROOT/access";
+$authorsfile = "doc/en_US.ISO8859-1/share/sgml/authors.ent";
+
+$cvsroot = $ENV{'CVSROOT'};
+$cvsroot = "/home/ncvs" if !$cvsroot;
+$cvs = "cvs -R -d $cvsroot co -p";
+
+open(PASSWD, 'ypcat passwd |') || die "open passwd data: $!\n";
+while (<PASSWD>) {
+	($login,undef) = split(/:/);
+	print "passwd user: $login\n" if $debug;
+	$users{$login} = 1;
+}
+close PASSWD;
+
+print "$cvs $accessfile\n";
+open (ACCESS, "$cvs $accessfile |") || die "checkout $accessfile: $!\n";
+while (<ACCESS>) {
+	chomp;
+	next if /^#/;
+	($accuser, undef) = split /\s/;
+	print "access user: $accuser\n" if $debug;
+	$access{$accuser} = 1;
+}
+close ACCESS;
+
+open (AUTHORS, "$cvs $authorsfile |") || die "checkout $authorsfile: $!\n";
+while (<AUTHORS>) {
+	$author = $1 if /ENTITY a\.([^ ]+)/;
+	next if !$author;
+	print "authors entity: $author\n" if $debug;
+	$authors{$author} = 1;
+	$author = "";
+}
+close AUTHORS;
+
+print "\n";
+print "People listed in CVSROOT/access, but have no account\n";
+print "----------------------------------------------------\n";
+foreach (keys %access) {
+	print "$_\n" if (!defined $users{$_});
+}
+
+print "\n";
+print "People listed in autors.ent, not have no account\n";
+print "------------------------------------------------\n";
+foreach (keys %authors) {
+	print "$_\n" if (!defined $users{$_});
+}
+
+print "\n";
+print "People listed in CVSROOT/access, but not listed in authors.ent\n";
+print "--------------------------------------------------------------\n";
+foreach (keys %access) {
+	print "$_\n" if (!defined $authors{$_});
+}
+
+print "\n";