Shell脚本整理

#!/bin/bash
#file name: pcpu_usage.sh
#purpose: 计算1小时内进程的CPU占用情况

#SECS为需要进行监视的总秒数
#UNIT_TIME是取样的时间间隔，单位是秒
SECS=3600
UNIT_TIME=60

STEPS=$(( $SECS / $UNIT_TIME ))

echo "watching CPU usage...";

for((i=0;i<STEPS;i++))
do
  ps -eocomm,pcpu | tail -n +2 >> ./cpu_usage.$$
  sleep $UNIT_TIME
done

echo
echo CPU eaters:

cat ./cpu_usage.$$ | awk ‘
{ process[$1]+=$2; }
END{
    for(i in process)
    {
      printf("%-20s %s\n",i,process[i]);
    }
}‘ | sort -nrk 2 | head

rm ./cpu_usage.$$