shell 备份mysql

#!/bin/bash
string_time=`date +%Y%m%d%H%M`;
file_path=`date +%Y%m%d`;
work_dir=‘/data/backup_dir/pet‘;
echo $work_dir;
echo $file_path;
file_path=$work_dir‘/‘$file_path;
echo $file_path;
if [ ! -d $file_path  ];then
  mkdir $file_path
else
  echo dir exist
fi
prefix=$1
if [ $prefix ]; then
        prefix=$prefix‘_‘
fi
echo $prefix
cd $file_path
date
# 备份所有的
/usr/local/mysql/bin/mysqldump -uroot -pPaic1234 -h192.168.5.211 -P3306 --set-gtid-purged=OFF --single-transaction  --hex-blob   dbname > ${prefix}sit_${string_time}_dbname.sql;
#  备份ddl
/usr/local/mysql/bin/mysqldump -uroot -pPaic1234 -h192.168.5.211 -P3306 -d --set-gtid-purged=OFF --single-transaction  --hex-blob   dbname > ${prefix}sit_${string_time}_dbname.sql;
# 备份dml
/usr/local/mysql/bin/mysqldump -uroot -pPaic1234 -h192.168.5.211 -P3306 -t --set-gtid-purged=OFF --single-transaction  --hex-blob   dbname > ${prefix}sit_${string_time}_dbname.sql;
date