#!/bin/bashinterval=3cpu_num=`cat /proc/stat | grep cpu[0-9] -c`start_idle=()start_total=()cpu_rate=()cpu_rate_file=./`hostname`_cpu_rate.csvif [ -f ${cpu_rate_file} ]; then    mv ${cpu_rate_file} ${cpu_rate_file}.`date +%m_%d-%H_%M_%S`.bakfifor((i=0;i<${cpu_num};i++)){    echo -n "cpu$i," >> ${cpu_rate_file}}echo -n "cpu_avg" >> ${cpu_rate_file}echo "" >> ${cpu_rate_file}while(true)do    for((i=0;i<${cpu_num};i++))    {        start=$(cat /proc/stat | grep "cpu$i" | awk ‘{print $2" "$3" "$4" "$5" "$6" "$7" "$8}‘)        start_idle[$i]=$(echo ${start} | awk ‘{print $4}‘)        start_total[$i]=$(echo ${start} | awk ‘{printf "%.f",$1+$2+$3+$4+$5+$6+$7}‘)    }    start=$(cat /proc/stat | grep "cpu " | awk ‘{print $2" "$3" "$4" "$5" "$6" "$7" "$8}‘)    start_idle[${cpu_num}]=$(echo ${start} | awk ‘{print $4}‘)    start_total[${cpu_num}]=$(echo ${start} | awk ‘{printf "%.f",$1+$2+$3+$4+$5+$6+$7}‘)    sleep ${interval}    for((i=0;i<${cpu_num};i++))    {        end=$(cat /proc/stat | grep "cpu$i" | awk ‘{print $2" "$3" "$4" "$5" "$6" "$7" "$8}‘)        end_idle=$(echo ${end} | awk ‘{print $4}‘)        end_total=$(echo ${end} | awk ‘{printf "%.f",$1+$2+$3+$4+$5+$6+$7}‘)        idle=`expr ${end_idle} - ${start_idle[$i]}`        total=`expr ${end_total} - ${start_total[$i]}`        idle_normal=`expr ${idle} \* 100`        cpu_usage=`expr ${idle_normal} / ${total}`        cpu_rate[$i]=`expr 100 - ${cpu_usage}`        echo "The CPU$i Rate : ${cpu_rate[$i]}%"        echo -n "${cpu_rate[$i]}," >> ${cpu_rate_file}    }    end=$(cat /proc/stat | grep "cpu " | awk ‘{print $2" "$3" "$4" "$5" "$6" "$7" "$8}‘)    end_idle=$(echo ${end} | awk ‘{print $4}‘)    end_total=$(echo ${end} | awk ‘{printf "%.f",$1+$2+$3+$4+$5+$6+$7}‘)    idle=`expr ${end_idle} - ${start_idle[$i]}`    total=`expr ${end_total} - ${start_total[$i]}`    idle_normal=`expr ${idle} \* 100`    cpu_usage=`expr ${idle_normal} / ${total}`    cpu_rate[${cpu_num}]=`expr 100 - ${cpu_usage}`    echo "The Average CPU Rate : ${cpu_rate[${cpu_num}]}%"    echo -n "${cpu_rate[${cpu_num}]}" >> ${cpu_rate_file}    echo "------------------"    echo "" >> ${cpu_rate_file}done