该脚本是先删除已经存在的文件，然后后台执行SQL语句将其执行结果以一定的格式写入文件

复制代码 代码如下:#!/bin/bash

if [ -f "/var/lib/mysql/hell.txt" ]; then

rm -f /var/lib/mysql/hell.txt

echo "delete /var/lib/mysql/hell.txt" >> hell.txt

fi

mysql -uroot -plab <<EOF

use home;

select YongHuID,XueYuanID into outfile './hell.txt' fields terminated by '|' lines terminated by 'rn' from sns_home_user where YongHuID < 20;

EOF