#! /bin/sh # filename killcpu.shif [ $# -ne 1 ] ; then  echo "USAGE: $0 <CPUs>|stop"  exit 1;fistop(){ while read LINE  do    kill -9 $LINE    echo "kill $LINE sucessfull"  done < pid.txt cat /dev/null > pid.txt}start(){  echo "u want to cpus is: "$1  for i in `seq $1`do  echo -ne " i=0; while truedoi=i+1; done" | /bin/sh &  pid_array[$i]=$! ;donefor i in "${pid_array[@]}"; do  echo ‘pid is: ‘ $i ‘;‘;  echo $i >> pid.txtdone}case $1 in   stop)    stop  ;;   *)   start $1;;esac