不想加班到凌晨，又想一键导入昨晚的数据，那咋办呢？
定时启动Shell脚本。
废话少说，直接上：

首先先在mysql创建一个表用来测试：

mysql> create table myorder(ordid int primary key not null auto_increment,orderno varchar(20),orderdate date);
Query OK, 0 rows affected (0.02 sec)mysql> insert into myorder(orderno,orderdate) values('dd0001','2020-6-25'),('dd0002','2020-6-25'),('dd000)3','2020-6-26'),('dd0004','2020-6-26');
Query OK, 4 rows affected (0.00 sec)
Records: 4  Duplicates: 0  Warnings: 0mysql> select * from myorder;
+-------+---------+------------+
| ordid | orderno | orderdate  |
+-------+---------+------------+
|     1 | dd0001  | 2020-06-25 |
|     2 | dd0002  | 2020-06-25 |
|     3 | dd0003  | 2020-06-26 |
|     4 | dd0004  | 2020-06-26 |
+-------+---------+------------+
4 rows in set (0.00 sec)

写这玩意遇到的小难点：
1. shell去除字符串中所有空格：

[root@zjw myshl]# echo '1999-9-9' | sed 's/-//g'
199999

2.Shell怎么获得当前时间 带格式：

nowdate=$(date --date='1 day ago' '+%Y-%m-%d')

3.hdfs怎么取出文件名后几个

[root@zjw myshl]# hdfs dfs -ls /mydata |  awk '{print $8}' | cut -d '/' -f3 | grep -v "[0-9]\{4\})"
20/06/26 14:46:35 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable0610
test

大概就这几个要点，脚本正文：

#! /bin/bash
# get current date
nowdate=$(date --date='1 day ago' '+%Y-%m-%d')# if exists mydata folder, delete folder where folder'name not confirm 8 number
hdfs dfs -test -e /mydata/
if [ $? -eq 0 ];thenfiles=`hdfs dfs -ls /mydata |  awk '{print $8}' | cut -d '/' -f3 | grep -v "[0-9]\{4\})"`for fl in $filesdohdfs dfs -rmr /mydata/$fldone
elsehdfs dfs -mkdir -p /mydata/
fifoldername=`echo $nowdate|sed 's/-//g'`#import mysql data to hdfs
sqoop import --connect jdbc:mysql://192.168.56.100:3306/mydemo --driver com.mysql.jdbc.Driver  --username root --password 1234 --query "select * from myorder where orderdate="\'$nowdate\'" and \$CONDITIONS" --target-dir /mydata/$foldername -m 1

授权之后简单运行一下：

直接芜湖。