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This article mainly introduces what are the commonly used commands in HDFS, which can be used for reference by interested friends. I hope you can learn a lot after reading this article.

What is HDFS: HDFS or Hadoop distributed File system (Hadoop Distributed Filesystem), which stores very large files in streaming data access mode, runs on commercial hardware clusters, and is a file system that manages storage across multiple computers in the network.

Create a directory

Hadoop dfs-mkdir / home

Upload a file or directory to hdfs

Hadoop dfs-put hello / hadoop dfs-put hellodir/

View the catalog

Hadoop dfs-ls /

Create an empty file

Hadoop dfs-touchz / 361way

Delete a file

Hadoop dfs-rm / 361way

Delete a directory

Hadoop dfs-rmr / home

Rename

Hadoop dfs-mv / hello1 / hello2

View Fil

Hadoop dfs-cat / hello

Merge all the contents under the established directory into a file and download it to the local

Hadoop dfs-getmerge / hellodir wa

Use du file and directory sizes

Hadoop dfs-du /

Copy the directory locally

Hadoop dfs-copyToLocal / home localdir

Check the status of dfs

Hadoop dfsadmin-report

Check out the running Java program

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