Bash parse CPU script

#!/bin/bash
prev_total=0
prev_idle=0
while true; do
cpu=`cat /proc/stat | head -n1 | sed 's/cpu //'`
user=`echo $cpu | awk '{print $1}'`
system=`echo $cpu | awk '{print $2}'`
nice=`echo $cpu | awk '{print $3}'`
idle=`echo $cpu | awk '{print $4}'`
wait=`echo $cpu | awk '{print $5}'`
irq=`echo $cpu | awk '{print $6}'`
srq=`echo $cpu | awk '{print $7}'`
zero=`echo $cpu | awk '{print $8}'`
total=$(($user+$system+$nice+$idle+$wait+$irq+$srq+$zero))
diff_idle=$(($idle-$prev_idle))
diff_total=$(($total-$prev_total))
usage=$(($((1000*$(($diff_total-$diff_idle))/$diff_total+5))/10))
clear
echo "Current Usage: $usage%"
prev_total=$total
prev_idle=$idle
sleep 1
done

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