#!/bin/sh

host="$1"
community="$2"

obtain() {
  snmpwalk -v1 -c "$community" $host .1.3.6.1.4.1.2021.11 | (
  s=0
  while read o e t v
  do
    case "$o" in
#    *ssCpuRawUser*|*ssCpuRawNice*|*ssCpuRawSystem*|*ssCpuRawIdle*|*ssCpuRawInterrupt*|*CpuRawKernel*)
    *ssCpuRawUser*|*ssCpuRawNice*|*ssCpuRawIdle*|*ssCpuRawInterrupt*|*CpuRawKernel*)
 	 s=$(($s+$v))
	 ;;
    esac
  done
  echo $s
 )  
}

prev=`obtain`
while :
do
 sleep 1
 new=`obtain`
 echo $(($new-$prev))
 prev=$new
done