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【旧代码】mysql备份的shell脚本

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#!/bin/sh
bk_to="/var/mysql-backup-`date +%Y-%m-%d-%k-%M-%S |tr -d ' '`"
user_name="root"
user_pw="dev"

sql="
flush tables with read lock;
system cp -pR /var/lib/mysql $bk_to; 
unlock tables;
"
mysql -u $user_name -p$user_pw -e "$sql"
echo $sql
tar cjf $bk_to.bz2 $bk_to
rm -rf $bk_to