Shell cutting Nginx Log tool for five days without restarting Nginx

Ideas:

1, back up yesterday's log, while deleting the five days before the backup data.

2, copy the log file, and set the original log file is empty

Shell

#!/bin/bash
#function: Cut nginx log files
#author Kung

log_path= '/home/wwwlogs/' log_bak_path= '
/ home/wwwlogs_bak/'
date_yesterday=$ (date-d "Yesterday" + "%y-%m-%d")
del_date=$ (date-d "$date _yesterday 5 Day ago "+"%y-%m-%d ")

mkdir-p ${log_bak_path}${date_yesterday} for

file in ' ls ${log_path} '
do
        CP ${ Log_path}${file} ${log_bak_path}${date_yesterday}
        echo ' > ${log_path}${file} done

if [-D ${log_ Bak_path}${del_date}]
then
        rm-rf ${log_bak_path}${del_date}
fi