shell控制运行次数(根据日期判断)

#!/bin/bash
#
#site: www.jiaochengji.com
update()
{
date_d=`date  "+%Y-%m-%d"`
echo "$date_d"    >>run_file
echo "update 完成,将日期写入run_file文件中（标记单天已运行过）"
}
run_check()
{
       if [ -f run_file ];then
               run_date=`awk 'END {print$0}'  run_file`
               if  [ $run_date = $date_d ];then
                       echo "$date_d已运行过一次，退出"
                       exit 0
               else
                       echo "$date_d未有运行记录,调用update运行"
                       update
               fi
       else
               update
       fi
}
main()
{
run_check
}
main