HDFS Commands

 

HDFS IMPORTANT COMMANDS

1. Start Hadoop service by using the command

sbin/start-dfs.sh

2. Hadoop HDFS mkdir Command Usage:

hadoop fs –mkdir /path/directory_name

3. Hadoop HDFS ls Command Usage:

hadoop fs -ls /path

4. Hadoop HDFS put Command Usage:

haoop fs -put <localsrc> <dest>

5. Hadoop HDFS copyFromLocal Command Usage:

hadoop fs -copyFromLocal <localsrc> <hdfs destination>

6. Hadoop HDFS get Command Usage:

hadoop fs -get <src> <localdest>

7. Hadoop HDFS copyToLocal Command Usage:

hadoop fs -copyToLocal <hdfs source> <localdst>

8. Hadoop HDFS cat Command Usage:

hadoop fs –cat /path_to_file_in_hdfs

9. Hadoop HDFS mv Command Usage:

hadoop fs -mv <src> <dest>

10. Hadoop HDFS cp Command Usage:

hadoop fs -cp <src> <dest>

11. HDFS moveFromLocal Command Usage:

hadoop fs -moveFromLocal <localsrc> <dest>

12. HDFS moveToLocal Command Usage:

hadoop fs -moveToLocal <src> <localdest>

13. HDFS tail Command Usage:

hadoop fs -tail [-f] <file>

14. HDFS rm Command Usage:

hadoop fs –rm <path>

15. HDFS chown Command Usage:

hadoop fs -chown [-R] [owner] [:[group]] <path>

16. HDFS chgrp Command Usage:

hadoop fs -chgrp <group> <path>

17. HDFS du Command Usage:

hadoop fs –du –s /directory/filename

18. HDFS df Command Usage:df shows the capacity, size, and free space available on the HDFS file system.

hadoop fs -df [-h] <path>

19.HDFS fsck Command Usage:

hadoop fsck <path> [ -move | -delete | -openforwrite] [-files [-blocks [-locations | -racks]]]

we are trying to check the health of the files in ‘dataflair’ directory present in HDFS using the fsck command

20. Hadoop count Command Usage:

hadoop fs -count [options] <path>