#!/bin/sh
## echo user nice system idle iowait irq softirq
CPULOG_1=$(cat /proc/stat | grep 'cpu ' | awk '{print $2" "$3" "$4" "$5" "$6" "$7" "$8}')
SYS_IDLE_1=$(echo $CPULOG_1 | awk '{print $4}')
Total_1=$(echo $CPULOG_1 | awk '{print $1+$2+$3+$4+$5+$6+$7}')
sleep 1
CPULOG_2=$(cat /proc/stat | grep 'cpu ' | awk '{print $2" "$3" "$4" "$5" "$6" "$7" "$8}')
SYS_IDLE_2=$(echo $CPULOG_2 | awk '{print $4}')
Total_2=$(echo $CPULOG_2 | awk '{print $1+$2+$3+$4+$5+$6+$7}')
SYS_IDLE=`expr $SYS_IDLE_2 - $SYS_IDLE_1`
Total=`expr $Total_2 - $Total_1`
SYS_USAGE=`expr $SYS_IDLE/$Total*100 |bc -l`
SYS_Rate=`expr 100-$SYS_USAGE |bc -l`
Disp_SYS_Rate=`expr "scale=3; $SYS_Rate/1" |bc`
echo $Disp_SYS_Rate% 

#!/usr/bin/perl
use warnings;
$SLEEPTIME=5;
if (-e "/tmp/stat") {
    unlink "/tmp/stat";
}
open (JIFF_TMP, ">>/tmp/stat") || die "Can't open /proc/stat file!\n";
open (JIFF, "/proc/stat") || die "Can't open /proc/stat file!\n";
@jiff_0=;
print JIFF_TMP $jiff_0[0] ;
close (JIFF);
sleep $SLEEPTIME;
open (JIFF, "/proc/stat") || die "Can't open /proc/stat file!\n";
@jiff_1=;
print JIFF_TMP $jiff_1[0];
close (JIFF);
close (JIFF_TMP);

@USER=`awk '{print \$2}' "/tmp/stat"`;
@NICE=`awk '{print \$3}' "/tmp/stat"`;
@SYSTEM=`awk '{print \$4}' "/tmp/stat"`;
@IDLE=`awk '{print \$5}' "/tmp/stat"`;
@IOWAIT=`awk '{print \$6}' "/tmp/stat"`;
@IRQ=`awk '{print \$7}' "/tmp/stat"`;
@SOFTIRQ=`awk '{print \$8}' "/tmp/stat"`;

$JIFF_0=$USER[0]+$NICE[0]+$SYSTEM[0]+$IDLE[0]+$IOWAIT[0]+$IRQ[0]+$SOFTIRQ[0];
$JIFF_1=$USER[1]+$NICE[1]+$SYSTEM[1]+$IDLE[1]+$IOWAIT[1]+$IRQ[1]+$SOFTIRQ[1];
$SYS_IDLE=($IDLE[0]-$IDLE[1]) / ($JIFF_0-$JIFF_1) * 100;
$SYS_USAGE=100 - $SYS_IDLE;
printf ("The CPU usage is %1.2f%%\n",$SYS_USAGE);