crontab设置定时任务脚本文件每秒运行一次，每个月最后一天的21点到22点 每20分钟（1200秒）执行一次

#!/bin/bash
step=2
for((i=0;i<60;i=(i+step)));do
 php /home/www/tp6/think zhang
 sleep $step
done
exit 0

#!/bin/bash
today=`date +%d`
hour=`date +%H`
last_day=`cal | xargs | awk '{print $NF}'`
if [ "$today" != "$last_day" ];then
        echo "today is not last day!"
         exit 1
 fi
 if [ "$hour" -ge 21 ] && [ "$hour" -lt 22 ] ;then
step=1200
for((i=0;i<3600;i=(i+step)));do
          php /www/wwwroot/otc-audit-develop/ think CopyNextMonthKPIi
          echo "hello world"
          sleep $step
  done
  exit 0
  fi
  echo "$hour not right"