我需要在hadoop文件系统中循环所有csv文件。我可以列出hdfs目录中的所有文件

> hadoop fs -ls /path/to/directory
Found 2 items
drwxr-xr-x   - hadoop hadoop          2 2016-10-12 16:20 /path/to/directory/tmp
-rwxr-xr-x   3 hadoop hadoop 4691945927 2016-10-12 19:37 /path/to/directory/myfile.csv

并且可以使用

for filename in /path/to/another/directory/*.csv; do echo $filename; done

但是我怎样才能把两者结合起来呢？我试过了

for filename in `hadoop fs -ls /path/to/directory | grep csv`; do echo $filename; done

但这给了我一些无稽之谈

Found
2
items
drwxr-xr-x

hadoop
hadoop
2    
2016-10-12
....