#!/bin/bash

usage=$(cat <(grep 'cpu ' /proc/stat) <(sleep 0.3 && grep 'cpu ' /proc/stat) | awk -v RS="" '{print ($13-$2+$15-$4)*100/($13-$2+$15-$4+$16-$5)}' | cut -d'.' -f1)"%"

echo " $usage"