diff --git a/fon/fon.pl b/fon/fon.pl
new file mode 100755
index 0000000..c7c1185
--- /dev/null
+++ b/fon/fon.pl
@@ -0,0 +1,230 @@
+#!/usr/bin/perl -w
+use strict;
+use Data::Dumper;
+use MIME::Base64;
+use Encode;
+use utf8;
+
+binmode(STDOUT, ":utf8");
+
+my %multichar;
+my %escapechar;
+
+my $cache = 'ldap.dump';
+my $USECACHE = 0;
+
+my %L;
+my %O;
+my %M;
+
+my $SRCH = shift || '.';
+
+get_ldap_addressbook( \%L );
+
+for my $l ( sort { lc( $L{$a}->{sn} ) cmp lc( $L{$b}->{sn} ) } keys %L ) {
+    if ( match_entry( $SRCH, $L{$l} ) >= 0 ) {
+        push_entry( $L{$l} );
+    }
+}
+
+my @order = ( 'name', 'room', 'fone', 'mail' );
+
+exit unless exists($O{name});
+
+my $e = scalar( @{ $O{name} } ) - 1 ;
+
+for my $i ( 0 .. $e ) {
+
+    for my $k (@order) {
+        printf "%-*s   ",$M{$k}, $O{$k}[$i];
+#        print substr( $O{$k}[$i] . ( '.' x $M{$k}) , 0, $M{$k} ) . '   ';
+    }
+    printf "\n";
+
+}
+
+exit;
+
+sub match_entry {
+    my ( $SRCH, $e ) = @_;
+    my $srch          = simplify($SRCH);
+    my @searchentries = ( 'sn', 'givenName', 'telephoneNumber', 'roomNumber', 'mail' );
+
+    my $LL = join( ' ', map { join( ' ', @{ $e->{$_} } ) } @searchentries );
+    my $ll = simplify($LL);
+
+    return index( $ll, $srch );
+}
+
+sub simplify {
+    my $S = shift;
+    my $s = s2a( lc $S );
+    return $s;
+}
+
+sub len {
+  return length(Encode::encode_utf8(shift));
+}
+
+sub push_entry {
+    my $e = shift;
+    my $t;
+    my $l;
+    $t = join( '/', @{ $e->{sn} } ) . ", " . join( '/', @{ $e->{givenName} } );
+    $l = len($t);
+    push @{ $O{name} }, $t;
+    $l > ( $M{name} || 0 ) and $M{name} = $l;
+
+
+    $t = join( '/', map {s/\(.*?\)|Betriebsarztraum|\s+//g;$_} @{ $e->{roomNumber} } );
+    $l = len($t);
+    push @{ $O{room} }, $t;
+    $l > ( $M{room} || 0 ) and $M{room} = $l;
+
+    $t = join( '/', map {s/\(.*?\)|\s+//g;s/\+49/0/;$_} @{ $e->{telephoneNumber} } );
+    $l = len($t);
+    push @{ $O{fone} }, $t;
+    $l > ( $M{fone} || 0 ) and $M{fone} = $l;
+
+    $t = join( ', ', map {s/molgen\.mpg\.de//g;$_} @{ $e->{mail} } );
+    $l = len($t);
+    push @{ $O{mail} }, $t;
+    $l > ( $M{mail} || 0 ) and $M{mail} = $l;
+}
+
+sub exec_ldapsearch {
+    my (@args) = @_;                                         # eg 'ldapsearch'
+    my $command = '/package/ldap/openldap/bin/ldapsearch';
+    my @ARGS = ( '-x', '-H', 'ldap://ldap.molgen.mpg.de/', '-ZZ', '-o', 'ldif-wrap=no' );
+    exec $command, @ARGS, @args;
+    die "exec failed: $!\n";
+}
+
+#
+# ldapsearch -x -H ldap://ldap.molgen.mpg.de/ -ZZ -b "dc=addressbook,dc=apps,dc=molgen,dc=mpg,dc=de"
+#
+
+sub get_ldap_addressbook {
+    my $L = shift;
+    my @LDAP;
+    if ( $USECACHE and -s $cache ) {
+        open C, '<', $cache or die "$!";
+        push @LDAP, (<C>);
+        close C;
+    }
+    else {
+        open C, '>', $cache or die "$!";
+
+        my $pid = open P, '-|';
+        defined $pid or die "$!\n";
+        $pid or exec_ldapsearch( '-b', 'dc=addressbook,dc=apps,dc=molgen,dc=mpg,dc=de' );
+        binmode P, ':utf8';
+
+        while (<P>) {
+            print C $_;
+            push @LDAP, $_;
+        }
+        close P;
+        close C;
+        $? and die "get_ldap_addressbook() failed\n";
+    }
+    my ($uid) = ('');
+
+    my @addlist = ( 'sn', 'givenName', 'mail', 'roomNumber', 'collectionId', 'telephoneNumber' );
+    for (@LDAP) {
+        chomp;
+        my $l = $_;
+        if ( $l =~ m{^# } and $uid ne '' ) {
+            map {
+                unless ( exists( $$L{$uid}->{$_} ) ) {
+                    push @{ $$L{$uid}->{$_} }, '-';
+                }
+            } @addlist;
+            $uid = '';
+        }
+        map {
+            if ( my ( $op, $v ) = $l =~ m{^$_(::?)\s*(.+)} ) {
+                $op eq '::' and $v = decode('utf8',decode_base64($v));
+                die "$uid -> $_\n" unless defined($v);
+                push @{ $$L{$uid}->{$_} }, $v;
+            }
+        } @addlist;
+        if ( $l =~ /^uid:\s+(.*)/ ) {
+            $uid = $1;
+            next;
+        }
+    }
+    return;
+}
+
+sub s2a {
+    $_ = shift;
+    s/(\xc2|\xc3)(.)/$multichar{$1}{$2}||$1.$2/eg;
+    s/([^a-z0-9])/$escapechar{$1}||$1/eg;
+    return $_;
+}
+
+BEGIN {
+    %multichar = (
+        "\xc2" => { "\xb4" => "'", },
+        "\xc3" => {
+            "\x9f" => 'ss',
+            "\xa4" => 'ae',
+            "\xa5" => 'a',
+            "\xa8" => 'e',
+            "\xa9" => 'e',
+            "\xb6" => 'oe',
+            "\xbc" => 'ue',
+        },
+    );
+    %escapechar = (
+        "\x82" => 'e',
+        "\x86" => 'a',
+        "\x88" => 'e',
+        "\x8a" => 'e',
+        "\x87" => 'c',
+        "\x92" => '\'',    # \0222
+        "\x97" => 'u',
+        "\x9a" => 'Ue',
+        "\xb0" => 'o',
+        "\xe5" => 'a',
+        "\xf1" => 'n',
+        "\xf2" => 'o',
+        "\xf3" => 'o',
+        "\xf8" => 'o',
+        "\xf9" => 'u',
+        "\201" => 'ue',
+        "\202" => 'e',
+        "\205" => 'A',
+        "\204" => 'ae',
+        "\220" => 'E',
+        "\224" => 'oe',
+        "\241" => 'i',     # ! inverted
+        "\242" => 'c',     # ! c/
+        "\244" => 'n',
+        "\264" => '\'',
+        "\304" => 'Ae',
+        "\311" => 'E',
+        "\312" => 'E',
+        "\323" => 'O',
+        "\326" => 'Oe',
+        "\334" => 'Ue',
+        "\337" => 'ss',
+        "\340" => 'a',
+        "\341" => 'ss',    # <E1>
+        "\342" => 'a',
+        "\344" => 'ae',
+        "\347" => 'c',
+        "\350" => 'e',
+        "\351" => 'e',     # <E9>
+        "\352" => 'e',
+        "\355" => 'i',
+        "\357" => 'i',
+        "\366" => 'oe',
+        "\372" => 'u',
+        "\373" => 'u',
+        "\374" => 'ue',
+        "\364" => 'o',
+    );
+
+}
diff --git a/install.sh b/install.sh
index 110ca0d..34eb2de 100755
--- a/install.sh
+++ b/install.sh
@@ -169,7 +169,7 @@ install_exec uvpn/uvpn                                   "$DESTDIR$usr_bindir/uv
 install_exec mxmount/mxmount                             "$DESTDIR$usr_bindir/mxmount"
 install_data mxmount/mxmount.service                     "$DESTDIR$systemdunitdir/mxmount.service"
 install_exec hostconfig/hostconfig                       "$DESTDIR$usr_sbindir/hostconfig"
-install_exec fon/fon.sh                                  "$DESTDIR$usr_bindir/fon"
+install_exec fon/fon.pl                                  "$DESTDIR$usr_bindir/fon"
 install_exec nfsdtop/nfsdtop                             "$DESTDIR$usr_sbindir/nfsdtop"
 install_data serial-log/serial-log\@.service             "$DESTDIR$systemdunitdir/serial-log@.service"
 install_exec serial-log/serial-log                       "$DESTDIR$usr_exec_prefix/libexec/serial-log"