取得CPU利用率

cpu.sh

#!/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 5  

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%