gistfile1.txt

#!/bin/bash

{ while sleep 1; do cat /proc/stat; done } | awk '
$1 == "cpu" { 
	sum=$2+$3+$4+$5;
	idle=$5;

	diff_sum=sum-old_sum;
	diff_idle=idle-old_idle;

	old_idle=idle;
	old_sum=sum

	relative_idle =100* diff_idle/diff_sum;
	relative_load = 100*1.0 - relative_idle;
		
	printf "CPU Idle %.2f%% CPU load: %.2f%%\n", relative_idle, relative_load;
}'