下面这个是脚本

postgreSQL_user="postgres" #postgreSQL备份用户
postgreSQL_host="IP地址" #数据库地址
postgreSQL_port="5432" #端口号
postgreSQL_charset="utf8"  #postgreSQL编码
backup_db_arr=("数据库名")  #要备份的数据库名称，多个用空格分开隔开 如("db1" "db2" "db3")
backup_location=/opt/b  #备份数据存放位置，末尾请不要带"/",此项可以保持默认，程序会自动创建文件夹
expire_backup_delete="ON" #是否开启过期备份删除 ON为开启 OFF为关闭
expire_days=3 #过期时间天数 默认为三天，此项只有在expire_backup_delete开启时有效
backup_time=`date +%Y%m%d%H%M`  #定义备份详细时间
backup_Ymd=`date +%Y-%m-%d` #定义备份目录中的年月日时间
backup_3ago=`date -d '3 days ago' +%Y-%m-%d` #3天之前的日期
backup_dir=$backup_location/$backup_Ymd  #备份文件夹全路径
welcome_msg="Welcome to use PostgreSQL backup tools!" #欢迎语
postgreSQL_ps=`ps -ef |grep PostgreSQL|wc -l`
# postgreSQL_listen=`netstat -an |grep LISTEN |grep $postgreSQL_port|wc -l`
if [ [$postgreSQL_ps == 0] -o [$postgreSQL_listen == 0] ]; then
        echo "ERROR:postgreSQL is not running! backup stop!"
        exit
else
        echo $welcome_msg
fi
psql -h$postgreSQL_host -p$postgreSQL_port -U$postgreSQL_user <<end
end
flag=`echo $?`
if [ $flag != "0" ]; then
        echo "ERROR:Can't connect postgreSQL server! backup stop!"
        exit
else
        echo "postgreSQL connect ok! 开始备份 Please wait......"
        # 判断有没有定义备份的数据库，如果定义则开始备份，否则退出备份
        if [ "$backup_db_arr" != "" ];then
                #dbnames=$(cut -d ',' -f1-5 $backup_database)
                #echo "arr is (${backup_db_arr[@]})"
                for dbname in ${backup_db_arr[@]}
                do
                        echo "database $dbname backup start..."
                        `mkdir -p $backup_dir`
                        `pg_dump -h$postgreSQL_host -p$postgreSQL_port -U$postgreSQL_user -d$dbname | gzip > $backup_dir/$dbname-$backup_time.sql.gz`
                        flag=`echo $?`
                        if [ $flag == "0" ];then
                                echo "database $dbname success backup to $backup_dir/$dbname-$backup_time.sql.gz"
                        else
                                echo "database $dbname backup fail!"
                        fi
                done
        else
                echo "ERROR:No database to backup! backup stop"
                exit
        fi
        # 如果开启了删除过期备份，则进行删除操作
        if [ "$expire_backup_delete" == "ON" -a  "$backup_location" != "" ];then
                 #`find $backup_location/ -type d -o -type f -ctime +$expire_days -exec rm -rf {} \;`
                 `find $backup_location/ -type d -mtime +$expire_days | xargs rm -rf`
                 echo "Expired backup data delete complete!"
        fi
        echo "All database backup success! Thank you! 数据库备份完成!!!!!"
        exit
fi

在使用此脚本的时候有可能遇到错误,不要慌张,用了此命令一定让你健步如飞

 sed -i 's/\r//' 文件名.sh 

然后再执行这条命令

sh 文件名.sh

希望能帮到你