linux获取cpu利用率shell脚本

			

				#!/bin/bash interval=3 cpu_num=`cat /proc/stat | grep cpu[0-9] -c` start_idle=() start_total=() cpu_rate=() cpu_rate_file=./`hostname`_cpu_rate.csv if [ -f ${cpu_rate_file} ]; then  mv ${cpu_rate_file} ${cpu_rate_file}.`date +%m_%d-%H_%M_%S`.bak fi for((i=0;i<${cpu_num};i++)) {  echo -n "cpu$i," >> ${cpu_rate_file} } echo -n "cpu" >> ${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
			

输出是逗号分隔符文件（.csv），可以用excel直接打开，方便数据分析和绘图等。

cpu0,cpu1,cpu2,cpu3,cpu4,cpu5,cpu6,cpu7,cpu8,cpu9,cpu10,cpu11,cpu12,cpu13,cpu14,cpu15,cpu16,cpu17,cpu18,cpu19,cpu20,cpu21,cpu22,cpu23,cpu_avg

4,1,2,13,11,5,2,4,1,1,3,4,7,5,12,16,3,1,4,5,1,2,2,1,5

4,1,2,13,12,1,8,4,4,5,15,7,2,5,3,1,1,1,1,4,3,2,1,0,4

4,2,1,15,11,2,5,6,4,6,7,4,3,4,2,4,1,8,1,3,3,2,1,1,4

6,3,3,15,11,3,5,8,6,4,11,4,8,18,7,4,1,1,5,11,4,6,4,5,7

22,1,2,14,10,2,5,6,6,6,7,8,1,5,10,8,1,2,1,3,3,1,1,1,5

cpu0	cpu1	cpu2	cpu3	cpu4	cpu5	cpu6	cpu7	cpu8	cpu9	cpu10	cpu11	cpu12	cpu13	cpu14	cpu15	cpu16	cpu17	cpu18	cpu19	cpu20	cpu21	cpu22	cpu23	cpu_avg
4	1	2	13	11	5	2	4	1	1	3	4	7	5	12	16	3	1	4	5	1	2	2	1	5
4	1	2	13	12	1	8	4	4	5	15	7	2	5	3	1	1	1	1	4	3	2	1	0	4
4	2	1	15	11	2	5	6	4	6	7	4	3	4	2	4	1	8	1	3	3	2	1	1	4
6	3	3	15	11	3	5	8	6	4	11	4	8	18	7	4	1	1	5	11	4	6	4	5	7
22	1	2	14	10	2	5	6	6	6	7	8	1	5	10	8	1	2	1	3	3	1	1	1	5