Hadoop Commands(Part-1)

1. To check whether all the daemons are working or not.

Command: jps

2. To know the contents or list of contents.

Command: hadoop fs -ls à to know list of contents in the hadoop home directory.

Command : hadoop fs -ls / àto know list of contents in the hadoop root directory.

Output 1:

Output 2:

3. If we want to list the contents of a particular directory.

Command: hadoop fs -ls /directoryname

Output:

4. If we want to create a directory.

Command: hadoop fs -mkdir directoryname

Output:

5. To create an empty file of any format.

Command: hadoop fs -touchz filename

Output:

6. To Copy data from the local system

Command: hadoop fs -copyFromLocal filelocation to hadoop system(location)

(OR)

hadoop fs -put filelocation hadoop system(location)

Output:

7. To copy files from Hadoop file system to the local system.

Command: hadoop fs -copyToLocal filelocation to required location. (OR)

hadoop fs -get filelocation to required location.

Output:

8. To display the contents of the file.

Command: hadoop fs -cat filelocation

9. To move files from one directory to another directory or between local and Hadoop systems.

Command: hadoop fs -mv filelocation(to be transferred) location(file to be saved)

10. To check the disk usage of any directory.

Command: hadoop fs -du directoryname

Output:

11.To check the disk usage of the entire directories at one place.

Command: hadoop fs -dus directoryname

Output :