Patch for bgraphs scripts, with these changes:
 - use /bin/sh instead of bash [bash is optional in FreeBSD]
 - easy configurable network interface [TODO: add support for multiple
   interfaces]
 - easy configurable multiple disks/slices support [borrowed from rc scripts]

To install:
wget http://www.ag0ny.com/download/bgraphs-1.1.tar.gz
tar zxvf bgraphs-1.1.tar.gz
cd bgraphs-1.1
patch -p1 <.../bgraphs-1.1-paulius.diff

see README and bgraphs.conf for examples ;)

--- bgraphs-1.1/bgraphs.conf.orig	Thu Jan 16 04:06:59 2003
+++ bgraphs-1.1/bgraphs.conf	Tue Apr 13 22:37:27 2004
@@ -9,3 +9,10 @@
 # Hostname of your machine
 HOSTNAME=`hostname`
 #HOSTNAME='host.domain.com'
+
+#IFACE=ep0
+#IFACE_GREP=Link#1
+#MAXBW=192 # in kbps
+
+#DISK0=/dev/ad0s1a
+#DISK1=/dev/ad0s4
--- bgraphs-1.1/cpu_load.sh.orig	Tue Feb 18 12:04:22 2003
+++ bgraphs-1.1/cpu_load.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 TIMESTAMP=`date +%s`
 
--- bgraphs-1.1/cpu_load_create.sh.orig	Tue Feb 18 12:04:43 2003
+++ bgraphs-1.1/cpu_load_create.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 rrdtool create $DATABASE_DIRECTORY/cpu_load.rrd -s 60 \
 	DS:load1:GAUGE:600:0:U \
--- bgraphs-1.1/cpu_load_graphs.sh.orig	Tue Feb 18 12:04:56 2003
+++ bgraphs-1.1/cpu_load_graphs.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 RRDB=$DATABASE_DIRECTORY/cpu_load.rrd
 NOW=`date +%s`
@@ -10,7 +10,7 @@
 ONE_YEAR_AGO=$(($NOW-29030400))
 TIMESTAMP="                   Generated on `date`"
 
-function draw_graphic()
+draw_graphic()
 {
 	rrdtool graph $GRAPHS_DIRECTORY/$1 -s $2 -e $3 -a PNG \
 	-t "CPU load for $4" \
--- bgraphs-1.1/disk_usage.sh.orig	Tue Feb 18 12:05:11 2003
+++ bgraphs-1.1/disk_usage.sh	Tue Apr 13 22:20:01 2004
@@ -1,10 +1,22 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 TIMESTAMP=`date +%s`
 
 # USAGE = space_used:space_available
-USAGE=`df -k | grep da0s1a | awk '{ print $3":"$4 }'`
 
-rrdtool update $DATABASE_DIRECTORY/disk_usage.rrd $TIMESTAMP:$USAGE
+
+_disk=0
+while : ; do
+	eval _DISK_=\$DISK${_disk}
+	if [ -n "${_DISK_}" ]; then
+		DISKDEV=`basename $_DISK_`
+		_disk=$((${_disk} + 1))
+		USAGE=`df -k | grep $_DISK_ | awk '{ print $3":"$4 }'`
+		rrdtool update $DATABASE_DIRECTORY/disk_usage_$DISKDEV.rrd $TIMESTAMP:$USAGE
+	else
+		break;
+	fi
+done
+
--- bgraphs-1.1/disk_usage_create.sh.orig	Tue Feb 18 12:05:24 2003
+++ bgraphs-1.1/disk_usage_create.sh	Tue Apr 13 22:20:01 2004
@@ -1,16 +1,27 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
+
+_disk=0
+while : ; do
+	eval _DISK_=\$DISK${_disk}
+	if [ -n "${_DISK_}" ]; then
+		DISKDEV=`basename $_DISK_`
+		_disk=$((${_disk} + 1))
+		rrdtool create $DATABASE_DIRECTORY/disk_usage_$DISKDEV.rrd -s 60 \
+			DS:used:GAUGE:600:0:U \
+			DS:avail:GAUGE:600:0:U \
+			RRA:AVERAGE:0.5:1:483840 \
+			RRA:MIN:0.5:1440:1 \
+			RRA:MAX:0.5:1440:1 \
+			RRA:MIN:0.5:10080:1 \
+			RRA:MAX:0.5:10080:1 \
+			RRA:MIN:0.5:40320:1 \
+			RRA:MAX:0.5:40320:1 \
+			RRA:MIN:0.5:483840:1 \
+			RRA:MAX:0.5:483840:1
+	else
+		break;
+	fi
+done
 
-rrdtool create $DATABASE_DIRECTORY/disk_usage.rrd -s 60 \
-	DS:used:GAUGE:600:0:U \
-	DS:avail:GAUGE:600:0:U \
-	RRA:AVERAGE:0.5:1:483840 \
-	RRA:MIN:0.5:1440:1 \
-	RRA:MAX:0.5:1440:1 \
-	RRA:MIN:0.5:10080:1 \
-	RRA:MAX:0.5:10080:1 \
-	RRA:MIN:0.5:40320:1 \
-	RRA:MAX:0.5:40320:1 \
-	RRA:MIN:0.5:483840:1 \
-	RRA:MAX:0.5:483840:1
--- bgraphs-1.1/disk_usage_graphs.sh.orig	Tue Feb 18 12:05:42 2003
+++ bgraphs-1.1/disk_usage_graphs.sh	Tue Apr 13 22:20:01 2004
@@ -1,10 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
-
-RRDB=$DATABASE_DIRECTORY/disk_usage.rrd
-DISK='/dev/da0s1a'
-DISKDEV='da0s1a'
+. /usr/local/etc/bgraphs.conf
 
 NOW=`date +%s`
 ONE_HOUR_AGO=$(($NOW-3600))
@@ -14,10 +10,10 @@
 ONE_YEAR_AGO=$(($NOW-29030400))
 TIMESTAMP="                   Generated on `date`"
 
-function draw_graphic()
+draw_graphic()
 {
 	rrdtool graph $GRAPHS_DIRECTORY/$1 -s $2 -e $3 -a PNG \
-	-v Gigabytes -t "Disk usage for $4" \
+	-v Gigabytes -t "Disk $DISKDEV usage for $4" \
 	-l 0 -r \
 	DEF:used=$RRDB:used:AVERAGE CDEF:usedgb=used,1024,* AREA:usedgb#ff8080:"Space used" \
 	DEF:avail=$RRDB:avail:AVERAGE CDEF:totalgb=avail,1024,* STACK:totalgb#80ff80:"Space free" \
@@ -26,7 +22,21 @@
 	COMMENT:"$5\n"
 }
 
-draw_graphic 'disk_'$DISKDEV'_day.png' $ONE_DAY_AGO $NOW "$HOSTNAME (last 24 hours)" "$TIMESTAMP"
-draw_graphic 'disk_'$DISKDEV'_week.png' $ONE_WEEK_AGO $NOW "$HOSTNAME (last week)" "$TIMESTAMP"
-draw_graphic 'disk_'$DISKDEV'_month.png' $ONE_MONTH_AGO $NOW "$HOSTNAME (last month)" "$TIMESTAMP"
-draw_graphic 'disk_'$DISKDEV'_year.png' $ONE_YEAR_AGO $NOW "$HOSTNAME (last year)" "$TIMESTAMP"
+_disk=0
+while : ; do
+	eval _DISK_=\$DISK${_disk}
+	if [ -n "${_DISK_}" ]; then
+		DISKDEV=`basename $_DISK_`
+		_disk=$((${_disk} + 1))
+		RRDB=$DATABASE_DIRECTORY/disk_usage_$DISKDEV.rrd
+
+		draw_graphic 'disk_'$DISKDEV'_day.png' $ONE_DAY_AGO $NOW "$HOSTNAME (last 24 hours)" "$TIMESTAMP"
+		draw_graphic 'disk_'$DISKDEV'_week.png' $ONE_WEEK_AGO $NOW "$HOSTNAME (last week)" "$TIMESTAMP"
+		draw_graphic 'disk_'$DISKDEV'_month.png' $ONE_MONTH_AGO $NOW "$HOSTNAME (last month)" "$TIMESTAMP"
+		draw_graphic 'disk_'$DISKDEV'_year.png' $ONE_YEAR_AGO $NOW "$HOSTNAME (last year)" "$TIMESTAMP"
+
+	else
+		break;
+	fi
+done
+
--- bgraphs-1.1/memory.sh.orig	Thu May  1 04:45:48 2003
+++ bgraphs-1.1/memory.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 TIMESTAMP=`date +%s`
 
--- bgraphs-1.1/memory_create.sh.orig	Tue Feb 18 12:06:19 2003
+++ bgraphs-1.1/memory_create.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 rrdtool create $DATABASE_DIRECTORY/memory.rrd -s 60 \
 	DS:free:GAUGE:600:0:U \
--- bgraphs-1.1/memory_graphs.sh.orig	Tue Feb 18 12:06:45 2003
+++ bgraphs-1.1/memory_graphs.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 RRDB=$DATABASE_DIRECTORY/memory.rrd
 NOW=`date +%s`
@@ -10,7 +10,7 @@
 ONE_YEAR_AGO=$(($NOW-29030400))
 TIMESTAMP="                   Generated on `date`"
 
-function draw_graphic()
+draw_graphic()
 {
 	rrdtool graph $GRAPHS_DIRECTORY/$1 -s $2 -e $3 -a PNG \
 	-t "Memory usage for $4" \
--- bgraphs-1.1/network_usage.sh.orig	Tue Feb 18 12:07:03 2003
+++ bgraphs-1.1/network_usage.sh	Tue Apr 13 22:20:01 2004
@@ -1,11 +1,11 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 TIMESTAMP=`date +%s`
 
 # Modify the following line so it will return two values separated by a colon: bytes_in:bytes_out
-TRAFFIC=`netstat -ibI tun0 | grep giskard | awk '{ print $7":"$10 }'`
+TRAFFIC=`netstat -ibI $IFACE | grep $IFACE_GREP | awk '{ print $7":"$10 }'`
 
 rrdtool update $DATABASE_DIRECTORY/network_usage.rrd $TIMESTAMP:$TRAFFIC
 rrdtool update $DATABASE_DIRECTORY/network_usage_averages.rrd $TIMESTAMP:$TRAFFIC
--- bgraphs-1.1/network_usage_create.sh.orig	Tue Feb 18 12:07:16 2003
+++ bgraphs-1.1/network_usage_create.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 rrdtool create $DATABASE_DIRECTORY/network_usage.rrd -s 60 \
 	DS:in:COUNTER:600:U:U \
--- bgraphs-1.1/network_usage_graphs.sh.orig	Tue Feb 18 12:07:27 2003
+++ bgraphs-1.1/network_usage_graphs.sh	Thu Apr 29 11:16:44 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 RRDB=$DATABASE_DIRECTORY/network_usage.rrd
 RRDB_AVG=$DATABASE_DIRECTORY/network_usage_averages.rrd
@@ -12,11 +12,11 @@
 ONE_YEAR_AGO=$(($NOW-29030400))
 TIMESTAMP="                   Generated on `date`"
 
-function draw_graphic()
+draw_graphic()
 {
 	rrdtool graph $GRAPHS_DIRECTORY/$1 -s $2 -e $3 -a PNG\
-	-v Kbps -t "Network usage for $4" \
-	-r -u 256 -l -80 \
+	-v kbps -t "$IFACE usage for $4" \
+	-r -u $MAXBW -l -$MAXBW \
 	DEF:output=$RRDB:out:AVERAGE \
 	DEF:input=$RRDB:in:AVERAGE \
 	CDEF:kbpsout=output,8,*,1000,/ \
--- bgraphs-1.1/number_processes.sh.orig	Thu May  1 04:45:37 2003
+++ bgraphs-1.1/number_processes.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 TIMESTAMP=`date +%s`
 
--- bgraphs-1.1/number_processes_create.sh.orig	Thu May  1 04:46:08 2003
+++ bgraphs-1.1/number_processes_create.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/sh
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 rrdtool create $DATABASE_DIRECTORY/number_processes.rrd -s 60 \
 	DS:numprocs:GAUGE:600:0:U \
--- bgraphs-1.1/number_processes_graphs.sh.orig	Thu May  1 04:44:45 2003
+++ bgraphs-1.1/number_processes_graphs.sh	Tue Apr 13 22:20:01 2004
@@ -1,6 +1,6 @@
-#!/usr/local/bin/bash
+#!/bin/sh
 
-source /etc/bgraphs.conf
+. /usr/local/etc/bgraphs.conf
 
 RRDB=$DATABASE_DIRECTORY/number_processes.rrd
 
@@ -12,7 +12,7 @@
 ONE_YEAR_AGO=$(($NOW-29030400))
 TIMESTAMP="                   Generated on `date`"
 
-function draw_graphic()
+draw_graphic()
 {
 	rrdtool graph $GRAPHS_DIRECTORY/$1 -s $2 -e $3 -a PNG \
 	-v Processes -t "Number of processes for $4" \