#!/bin/bash
　　##autor by huwj 20161019
　　MysqlDump='/usr/bin/mysqldump'
　　hostPort='localhost'
　　database='dbName'
　　dbPath='/data/mysqlBak/dbName'
　　uName='dbName'
　　uPass='dbPasswd'
　　Date=`date '+%Y%m%d%H%M'`
　　backPath='/data/mysqlBak/mysqlBack'
　　runLog="$backPath/log/run.log"
　　RM='/bin/rm'
　　MV='/bin/mv'
　　MKDIR='/bin/mkdir'
　　Find='/bin/find'
　　Tar='/bin/tar'
　　echo 'date=='$Date
　　#删除15天之前的备份文件 此方法根据文件生成时间来删除，若中间存在备份失败，容易误删除，风险较高，慎用！
　　delBackFile(){
　　cd $backPath
　　$Find  -mtime +15 |xargs rm -rf
　　}
　　#delBackFile
　　#开始执行备份操作
　　# the directory for story the newest backupss
　　test ! -d "$backPath/backup.0/" && $MKDIR -p "$backPath/backup.0/"
　　backUpMongo(){
　　if [ ! -d "$dbPath/$database" ]; then
　　echo "$Date starting to backup ..." >> $runLog
　　$MysqlDump -h $hostPort -u $uName -p$uPass $database  > $dbPath/$database.sql
　　cd $dbPath
　　echo "$Date starting to tar backfile..." >> $runLog
　　$Tar -zcvf  $backPath/backup.0/$database.$Date.tar.gz $database.sql
　　if [ -f "$backPath/backup.0/$database.$Date.tar.gz" ];then
　　$RM -rf $dbPath/$database.sql
　　echo "$Date backSuccess ，starting to mv backfile..." >> $runLog
　　# delete the oldest backup
　　test -d "$backPath/backup.15/" && $RM -rf "$backPath/backup.15"
　　# rotate backup directory
　　echo "$Date mv success ，starting to mv oldFile ....." >> $runLog
　　for int in  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
　　do
　　if ( test -d "$backPath"/backup."$int" )
　　then
　　next_int=`expr $int + 1`
　　$MV "$backPath"/backup."$int" "$backPath"/backup."$next_int"
　　fi
　　done
　　fi
　　else
　　echo "$Date rm backfile ...." >> $runLog
　　$RM -rf $dbPath/$database.sql
　　fi
　　}
　　backUpMongo