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【Shell】 shell判断hdfs文件目录是否存在

作者: / 发布于2017/6/1/ 778

Hadoop有提供相应的脚本去验证文件目录是否存在的：

-bash-3.2$ hadoop fs -help  
...  
-test -[defsz] <path>:    Answer various questions about <path>, with result via exit status.  
          -d  return 0 if <path> is a directory.  
          -e  return 0 if <path> exists.  
          -f  return 0 if <path> is a file.  
          -s  return 0 if file <path> is greater than zero bytes in size.  
          -z  return 0 if file <path> is zero bytes in size.  
        else, return 1.  
测试的hdfs目录中：

-bash-3.2$ hadoop fs -ls /user/hive/warehouse/yhd_gmv_month  
Found 3 items  
drwxr-xr-x   - deploy supergroup          0 2014-08-25 11:15 /user/hive/warehouse/yhd_gmv_month/ds=2014-08-24  
drwxr-xr-x   - deploy supergroup          0 2014-08-26 13:02 /user/hive/warehouse/yhd_gmv_month/ds=2014-08-25  
drwxr-xr-x   - deploy supergroup          0 2014-08-27 08:09 /user/hive/warehouse/yhd_gmv_month/ds=2014-08-26  

检验昨天产生的目录是否产生的shell脚本：
yesterday=$(date -d '-1 day' '+%Y-%m-%d')  
hadoop fs -test -e /user/hive/warehouse/yhd_gmv_month/ds=$yesterday  
if [ $? -eq 0 ] ;then  
    echo 'exist'  
else  
    echo 'Error! Directory is not exist'  
fi  
验证存在的输出结果如下：

-bash-3.2$ hadoop fs -test -e /user/hive/warehouse/yhd_gmv_month/ds=$yesterday  
if [ $? -eq 0 ] ;then  
    echo 'exist'  
else  
    echo 'Error! Directory is not exist Or Zero bytes in size'  
fi  
-bash-3.2$ if [ $? -eq 0 ] ;then  
> echo 'exist'  
> else  
> echo 'Error! Directory is not exist Or Zero bytes in size'  
> fi  
exist

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