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Hadoop is a Java-based framework and it runs on Linux based windows so commands are important for Hadoop. Hadoop Commands are used to access the all HDFS cluster files and directories. Here we discuss basic and important Hadoop commands to manage HDFS.

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Basic Shell Commands to Manage HDFS

Basic Commands:

1. mkdir:

mkdir is used to create the main directory

Syntax: Hadoop fs -mkdir

2. ls

Used to list out all directory in HDFS

Syntax: hadoop fs -ls <args>

3. mv <src><dest>

This command used to move one file from source to destination

Syntax: hadoop fs -mv <src> <dest>

4. cp <src><dest>

This command used to copy the file from source to destination within HDFS

Syntax: hadoop fs -cp <src> <dest>

5. fs -df hdfs

This command used to report the number of spaces used in hdfs files

Syntax: hadoop fs -df hdfs

6. fs -count hdfs

Used to count the number of files and directories within HDFS

Syntax: hadoop fs -count hdfs

7. rm

This command used to remove any diectory

Syntax: hadoop fs -rm <arg>

8. cat

Used to displays the contents of filename

Syntax: hadoop fs cat

9. fs -expunge

This command used to empty the trash

Syntax: hadoop fs -expunge

10. du <path>

Used to shows disk usage

Syntax: hadoop fs -du

11. tail

This command used to displays the last few lines fo file

Syntax: hadoop fs -tail <path[filename]>

12. touchz <path>

This command used to create a file and it contains current time and timestamp

Syntax: hadoop fs- touchz

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