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diff --git a/contrib/mrtgext.pl b/contrib/mrtgext.pl
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+#!/usr/bin/perl -w
+#
+#  mrtgext.pl  v0.3
+#    (c)2000 Cliff Woolley, Washington and Lee University
+#    jwoolley@wlu.edu
+#
+#  A UNIX counterpart to Jim Drews' MRTG Extension for netware servers
+#  Mimics output of mrtgext.nlm using output of various standard UNIX
+#  programs (df, uptime, and uname)
+#
+#  Dependencies:  I make some assumptions about the output format of
+#  your df and uptime commands.  If you have nonstandard outputs for
+#  any of these, either pick a different command that gives more
+#  standard output or modify the script below.  Example: use /usr/bin/bdf
+#  on HP-UX instead of /usr/bin/df, because bdf follows the output format
+#  I expect while df does not.  This was written on Linux and tested on
+#  HP-UX 10.20 (with changes to the subroutines at the bottom of the
+#  program to reflect HP's command parameters); similar tweaking could
+#  well be required to port this to other platforms.  If you get it
+#  working on your platform, please send me any changes you had to
+#  make so I can try to incorporate them.
+#
+#
+#  Following is what I expect the programs' outputs to look like:
+#  
+#  ======= df ========
+#  Filesystem           1k-blocks      Used Available Use% Mounted on
+#  /dev/sda1              1014696    352708    609612  37% /
+#  /dev/sda2              2262544    586712   1559048  27% /apps
+#  /dev/sda3              4062912    566544   3286604  15% /share
+#  /dev/sr0                651758    651758         0 100% /cdrom
+#  ===================
+#
+#  ===== uptime ======
+#  3:17pm  up 15 days,  4:40,  5 users,  load average: 0.12, 0.26, 0.33
+#  ===================
+#
+
+###############################################################
+#  Configuration section
+###############################################################
+
+$dfcmd          = "/bin/df 2>/dev/null";
+$uptimecmd      = "/usr/bin/uptime";
+%customcmds     = ( "PROCS"    => "numprocesses",
+                    "ZOMBIES"  => "numzombies",
+                    "MEMFREE"  => "memfree",
+                    "SWAPUSED" => "swapused",
+                    "TCPCONNS" => "tcpconns",
+                    "CLIENTS"  => "ipclients" );
+                           # These are functions that you can
+                           # define and customize for your system.
+                           # You probably need to change the provided
+                           # subroutines to work on your system (if
+                           # not Linux).
+
+$rootfsnickname = "root";  # this is necessary as a kludge to
+                           # better match the netware behavior.
+                           # if you already have a _filesystem_
+                           # mounted as /root, then you'll need
+                           # to change this to something else
+$DEBUG          = 0;
+$recvtimeout    = 30;
+
+
+###############################################################
+#  Program section
+###############################################################
+
+require 5.004;
+
+use Sys::Hostname;
+
+
+$DEBUG = $ARGV[0] unless ($DEBUG);
+$SIG{'ALRM'} = sub { exit 1; };
+
+# some things never change
+$hostname = hostname;
+
+
+if ( $DEBUG ) {
+    $| = 1;
+    print scalar localtime,": mrtgext.pl started\n";
+}
+
+# timeout period 
+alarm($recvtimeout);
+my $items = <STDIN>;
+alarm(0);
+
+$items =~ s/[\r\n]//g;
+( $DEBUG ) && print scalar localtime,": request: \"$items\"\n";
+my @items = split (/\s+/,"$items");
+( $DEBUG ) && print scalar localtime,": ",scalar @items," item(s) to process\n";
+
+my $uptime = `$uptimecmd`;
+my @df     = grep {/^\//} `$dfcmd`;
+
+my $processed = 1;
+
+foreach $_ (@items) {
+    ( $DEBUG ) && print scalar localtime,": processing item #$processed: \"$_\"\n";
+    $_ = uc; #convert $_ to upper case
+    if    ( /^UTIL1$/ ) {
+        $uptime =~ /load average: ([^,]+),/;
+        print $1 * 100,"\n";
+    }
+    elsif ( /^UTIL5$/ ) {
+        $uptime =~ /load average: [^,]+, ([^,]+)/;
+        print $1 * 100,"\n";
+    }
+    elsif ( /^UTIL15$/ ) {
+        $uptime =~ /load average: [^,]+, [^,]+, ([^,]+)/;
+        print $1 * 100,"\n";
+    }
+    elsif ( /^CONNECT$/ ) {
+        $uptime =~ /(\d+) users?,/;
+        print "$1\n";
+    }
+    elsif ( /^NAME$/ ) {
+        print "$hostname\n";
+    }
+    elsif ( /^UPTIME$/ ) {
+        $uptime =~ /up (.*),\s+\d+\s+users?,/;
+        print "$1\n";
+    }
+    elsif ( /^VOLUMES$/ ) {
+        foreach $dfline (@df) {
+            my $volname = (split(/\s+/, "$dfline"))[5];
+            $volname =~ s/^\/$/$rootfsnickname/;
+            $volname =~ s/^\///;
+            $volname =~ s/\//_/g;
+            print "$volname\n";
+        }
+    }
+    elsif ( /^VF(\w*)$/ ) {
+        my $volname = ("$1" eq uc("$rootfsnickname")) ? "/" : "$1";
+        foreach $dfline (@df) {
+            my @dfline = split(/\s+/, "$dfline");
+            if ($dfline[5] =~ /^\/?$volname$/i ) {
+                print (($dfline[1]-$dfline[2]) * 1024,"\n");
+                goto done;
+            }
+        }
+        ( $DEBUG ) && print scalar localtime,": ERROR: volume not found.\n";
+        print "-1\n";
+    }
+    elsif ( /^VU(\w*)$/ ) {
+        my $volname = ("$1" eq uc("$rootfsnickname")) ? "/" : "$1";
+        foreach $dfline (@df) {
+            my @dfline = split(/\s+/, "$dfline");
+            if ($dfline[5] =~ /^\/?$volname$/i ) {
+                print ($dfline[2] * 1024,"\n");
+                goto done;
+            }
+        }
+        ( $DEBUG ) && print scalar localtime,": ERROR: volume not found.\n";
+        print "-1\n";
+    }
+    elsif ( /^VS(\w*)$/ ) {
+        my $volname = ("$1" eq uc("$rootfsnickname")) ? "/" : "$1";
+        foreach $dfline (@df) {
+            my @dfline = split(/\s+/, "$dfline");
+            if ($dfline[5] =~ /^\/?$volname$/i ) {
+                print ($dfline[1] * 1024,"\n");
+                goto done;
+            }
+        }
+        ( $DEBUG ) && print scalar localtime,": ERROR: volume not found.\n";
+        print "-1\n";
+    }
+    elsif ( /^VKF(\w*)$/ ) {
+        my $volname = ("$1" eq uc("$rootfsnickname")) ? "/" : "$1";
+        foreach $dfline (@df) {
+            my @dfline = split(/\s+/, "$dfline");
+            if ($dfline[5] =~ /^\/?$volname$/i ) {
+                print (($dfline[1]-$dfline[2]),"\n");
+                goto done;
+            }
+        }
+        ( $DEBUG ) && print scalar localtime,": ERROR: volume not found.\n";
+        print "-1\n";
+    }
+    elsif ( /^VKU(\w*)$/ ) {
+        my $volname = ("$1" eq uc("$rootfsnickname")) ? "/" : "$1";
+        foreach $dfline (@df) {
+            my @dfline = split(/\s+/, "$dfline");
+            if ($dfline[5] =~ /^\/?$volname$/i ) {
+                print ($dfline[2],"\n");
+                goto done;
+            }
+        }
+        ( $DEBUG ) && print scalar localtime,": ERROR: volume not found.\n";
+        print "-1\n";
+    }
+    elsif ( /^VKS(\w*)$/ ) {
+        my $volname = ("$1" eq uc("$rootfsnickname")) ? "/" : "$1";
+        foreach $dfline (@df) {
+            my @dfline = split(/\s+/, "$dfline");
+            if ($dfline[5] =~ /^\/?$volname$/i ) {
+                print ($dfline[1],"\n");
+                goto done;
+            }
+        }
+        ( $DEBUG ) && print scalar localtime,": ERROR: volume not found.\n";
+        print "-1\n";
+    }
+    elsif ( /^ZERO$/ ) {
+        print "0\n";
+    }
+    elsif (exists( $customcmds{"$_"} )) {
+        my $cmdsub = "$customcmds{$_}";
+        print &$cmdsub."\n";
+    }
+    else {
+        print "-1\n";
+    }
+    done: $processed++;
+}
+( $DEBUG ) && print scalar localtime,": done.\n";
+
+
+###############################################################
+#  CUSTOMIZED PROCEDURES
+###############################################################
+
+sub numprocesses {
+
+    my $num = `/bin/ps -eaf | /usr/bin/tail -n +2 | /usr/bin/wc -l`;
+    chomp ($num);
+    $num =~ s/\s+//g;
+
+    $num;
+}
+
+sub numzombies {
+
+    my $num = `/bin/ps -afx | /usr/bin/awk '{print \$3}' | /usr/bin/grep Z | /usr/bin/tail -n +2 | /usr/bin/wc -l`;
+    chomp ($num);
+    $num =~ s/\s+//g;
+
+    $num;
+}
+
+sub tcpconns {
+
+    my $num = `/bin/netstat -nt | /usr/bin/tail -n +3 | /usr/bin/wc -l`;
+    chomp ($num);
+    $num =~ s/\s+//g;
+
+    $num;
+}
+
+sub ipclients {
+
+    my $num = `/bin/netstat -nt | /usr/bin/tail -n +3 | /usr/bin/awk '{print \$5}' | /bin/cut -d : -f 1 | /usr/bin/sort -nu | /usr/bin/wc -l`;
+    chomp ($num);
+    $num =~ s/\s+//g;
+
+    $num;
+}
+
+sub memfree {
+
+    open( FP, "/proc/meminfo" );
+    my @meminfo = <FP>;
+    close(FP);
+
+    #         total:    used:    free:  shared: buffers:  cached:
+    # Mem:  994615296 592801792 401813504 91193344 423313408 93118464
+    # Swap: 204791808        0 204791808
+    my ($total,$free,$buffers,$cache) = (split(/ +/,$meminfo[1]))[1,3,5,6];
+    
+    int(($free+$buffers+$cache)/$total*100);
+}
+
+sub swapused {
+
+    open( FP, "/proc/meminfo" );
+    my @meminfo = <FP>;
+    close(FP);
+
+    #         total:    used:    free:  shared: buffers:  cached:
+    # Mem:  994615296 592424960 402190336 89821184 423313408 93077504
+    # Swap: 204791808        0 204791808
+
+    my ($total,$used) = (split(/ +/,$meminfo[2]))[1,2];
+    
+    int($used/$total*100);
+}