Rmdir command is used to removing directories only if they are empty.Ĭopy file/folder from local disk to HDFS. Rmr command is used to deletes a file from Directory recursively, it is a very useful command when you want to delete a non-empty directory. HDFS rm command deletes a file and a directory from HDFS recursively. ![]() By specifying “/” at the beginning it creates a folder at root directory. By default, this directory would be owned by the user who is creating it. HDFS mkdir command is used to create a directory in HDFS. For more information follow ls- List Files and Folder HDFS ls command is used to display the list of Files and Directories in HDFS, This ls command shows the files with permissions, user, group, and other details. copyToLocal Copy files from HDFS to local file system -usage Return the Help for Individual Command -checksum Returns the checksum information of a file -chgrp Change group association of files/change the group of a file or a path -chmod Change the permissions of a file -chown change the owner and group of a file -df Displays free space -head Displays first kilobyte of the file -Create Snapshots Create a snapshot of a snapshottable directory -Delete Snapshots Delete a snapshot of from a snapshottable directory -Rename Snapshots Rename a snapshot -expunge create new checkpoint -Stat Print statistics about the file/directory -truncate Truncate all files that match the specified file pattern to the specified length -find Find File Size in HDFS HDFS Basic Commands ls – List Files and Folder dus Directory/file of total size -get Store file / Folder from HDFS to local file -getmerge Merge Multiple Files in an HDFS -count Count number of directory, number of files and file size -setrep Changes the replication factor of a file -mv HDFS Command to move files from source to destination -moveFromLocal Move file / Folder from local disk to HDFS -moveToLocal Move a File to HDFS from Local -cp Copy files from source to destination -tail Displays last kilobyte of the file -touch create, change and modify timestamps of a file -touchz Create a new file on HDFS with size 0 bytes -appendToFile Appends the content to the file which is present on HDF -copyFromLocal Copy file from local file system Command Description -ls List files with permissions and other details -mkdir Creates a directory named path in HDFS -rm To Remove File or a Directory -rmr Removes the file that identified by path / Folder and subfolders -rmdir Delete a directory -put Upload a file / Folder from the local disk to HDFS -cat Display the contents for a file -du Shows the size of the file on hdfs. Basic HDFS DFS Commandsīelow are basic hdfs dfs or hadoop fs Commands. Note that start-dfs.sh commands starts, name node, secondary name node, and data nodes. If you don’t have a Hadoop setup, follow Apache Hadoop Installation on Linux guide. In order to run hdfs dfs or hadoop fs commands, first, you need to start the Hadoop services by running the start-dfs.sh script from the Hadoop installation. ![]() It’s a write once read many numbers of times. Once written you cannot change the contents of the files on HDFS. HDFS is a distributed file system that stores data on commodity machines and provides very high aggregate bandwidth across the cluster. Major difference being hadoop commands are supported with multiple file systems like S3, Azure and many more. ![]() Hadoop provides two types of commands to interact with File System hadoop fs or hdfs dfs. In this article, I will mainly focus on Hadoop HDFS commands to interact with the files. To store data, Hadoop uses HDFS, and to process data, it uses MapReduce & Yarn. Hadoop is a open-source distributed framework that is used to store and process a large set of datasets. Note that some Syntax and output formats may differ between Unix and HDFS Commands. ![]() Apache Hadoop hadoop fs or hdfs dfs are file system commands to interact with HDFS, these commands are very similar to Unix Commands.
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