This is how I do it;
#!/bin/sh
#
# Script used for giving system information
# Last modified: 27-01-2008
while : ;
do
cpuspeed0=$(sysctl -n hw.cpuspeed)
cputempe0=$(sysctl -n hw.sensors.cpu0.temp0)
systempe0=$(sysctl -n hw.sensors.acpitz0.temp0)
battcapa0=$(sysctl -n hw.sensors.acpibat0.amphour3)
battchar0=$(sysctl -n hw.sensors.acpibat0.raw0)
if [ "$cpuspeed1" != "$cpuspeed0" ] || [ "$cputempe1" != "$cputempe0" ]
|| [ "$systempe1" != "$systempe0" ] || [ "$battcapa1" != "$battcapa0" ] || [
"$battchar1" != "$battchar0" ]; then
cpuspeed1=$cpuspeed0
cputempe1=$cputempe0
systempe1=$systempe0
battcapa1=$battcapa0
battchar1=$battchar0
battcapa1=$(echo $battcapa0 | sed 's/ Ah (.*//')
percentage=$(echo "scale=2; $battcapa1*100/7.2" | bc)
battinfo=$(echo $battchar0 | sed 's/.*(//' | sed 's/).*//')
clear
echo "OpenBSD Kernel version: $(sysctl -n kern.version)"
echo ""
echo "System speed : $cpuspeed0 Mhz"
echo "Processor temperature : $cputempe0 "
echo "System temperature : $systempe0 "
echo "Battery information : $percentage %, $battcapa1 Ah
($battinfo)"
fi
sleep 10
done
