該腳本是先刪除已經(jīng)存在的文件，然后后臺執(zhí)行SQL語句將其執(zhí)行結(jié)果以一定的格式寫入文件

代碼如下:#!/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 '/r/n' from sns_home_user where YongHuID < 20;
EOF