編寫sh指令碼如下：

#!/bin/bash
db_user="root"
db_passwd="123456"
db_name="test_db"
#進入備份目錄將之前的移動到old目錄
cd /mnt/backup/bakmysql
echo "you are in bakmysql directory now"
mv test_db* /mnt/backup/bakmysqlold
echo "Old databases are moved to bakmysqlold folder"
#備份目錄
backup_dir="/mnt/backup/bakmysql"
#時間格式
time=$(date +"%Y-%m-%d")
#mysql 備份的命令，注意有空格和沒有空格
mysqldump -u$db_user -p$db_passwd $db_name  > "$backup_dir/$db_name"-"$time.sql"
echo "your database backup successfully completed"
#這裡將7天之前的備份檔案刪掉
SevenDays=$(date -d -7day  +"%Y-%m-%d")
if [ -f /mnt/backup/bakmysqlold/pashanhu-$SevenDays.sql ]
then
rm -rf /mnt/backup/bakmysqlold/pashanhu-$SevenDays.sql
echo "you have delete 7days ago bak sql file "
else
echo "7days ago bak sql file not exist "
echo "bash complete"
fi

然後通過下面命令將腳步加入系統的計劃任務

crontab -e

0 2 * * * cd /usr/sbin/ && ./bakmysql.sh

儲存退出以後就可以了。

也許需要重啟crontab  啟用命令：/sbin/service crond restart

後期更改~結果如下