> 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

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

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

Found
2
items
drwxr-xr-x

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

for filename in `hadoop fs -ls /path/to/directory | awk '{print $NF}' | grep .csv$ | tr 'n' ' '`
do echo $filename; done