一个Mysql自动备份脚本

可以将这个脚本放进crontab，每天凌晨执行一次，自动备份这个脚本每天最多只执行一次，而且只保留最近五天的备份在服务器上。
代码:
#!/bin/bash
#This is a ShellScript For Auto DB Backup
#Powered by aspbiz
#2004-09
#Setting
#设置数据库名，数据库登录名，密码，备份路径，日志路径，数据文件位置，以及备份方式
#默认情况下备份方式是tar，还可以是Mysqldump,Mysqldotcopy
#默认情况下，用root(空)登录Mysql数据库，备份至/root/dbxxxxx.tgz
DBName=Mysql
DBUser=root
DBPasswd=
BackupPath=/root/
LogFile=/root/db.log
DBPath=/var/lib/Mysql/
#BackupMethod=Mysqldump
#BackupMethod=Mysqlhotcopy
#BackupMethod=tar
#Setting End

NewFile="$BackupPath"db$(date +%y%m%d).tgz
DumpFile="$BackupPath"db$(date +%y%m%d)
OldFile="$BackupPath"db$(date +%y%m%d --date=’5 days ago’).tgz
echo "-------------------------------------------" >> $LogFile
echo $(date +"%y-%m-%d %H:%M:%S") >> $LogFile
echo "--------------------------" >> $LogFile
#Delete Old File
if [ -f $OldFile ]
then
rm -f $OldFile >> $LogFile 2>&1
echo "[$OldFile]Delete Old File Success!" >> $LogFile
else
echo "[$OldFile]No Old Backup File!" >> $LogFile
fi
if [ -f $NewFile ]
then
echo "[$NewFile]The Backup File is exists,Can’t Backup!" >> $LogFile
else
case $BackupMethod in
Mysqldump)
if [ -z $DBPasswd ]
then
Mysqldump -u $DBUser --opt $DBName > $DumpFile
else
Mysqldump -u $DBUser -p$DBPasswd --opt $DBName > $DumpFile
fi
tar czvf $NewFile $DumpFile >> $LogFile 2>&1
echo "[$NewFile]Backup Success!" >> $LogFile
rm -rf $DumpFile
;;
Mysqlhotcopy)
rm -rf $DumpFile
mkdir $DumpFile
if [ -z $DBPasswd ]
then
Mysqlhotcopy -u $DBUser $DBName $DumpFile >> $LogFile 2>&1
else
Mysqlhotcopy -u $DBUser -p $DBPasswd $DBName $DumpFile >>$LogFile 2>&1
fi
tar czvf $NewFile $DumpFile >> $LogFile 2>&1
echo "[$NewFile]Backup Success!" >> $LogFile
rm -rf $DumpFile
;;
*)
/etc/init.d/Mysqld stop >/dev/null 2>&1
tar czvf $NewFile $DBPath$DBName >> $LogFile 2>&1
/etc/init.d/Mysqld start >/dev/null 2>&1
echo "[$NewFile]Backup Success!" >> $LogFile
;;
esac
fi
echo "-------------------------------------------" >> $LogFile