Mysql备份多库脚本

[root@DB script]# cat getdb.sh 
#!/bin/bash
mysql -uroot -proot "-BNe show databases;"|grep -v "information_schema"|grep -v "performance_schema" >aa.txt
x=`cat aa.txt`
for i in $x
do
mysqldump -proot --opt $i>$i.sql
done