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In my previous blogs, I have already discussed what is HDFS, its features, and architecture. The first step towards the journey to Big Data training is executing HDFS commands & exploring how HDFS works. In this blog, I will talk about the HDFS commands using which you can access the Hadoop File System.
So, let me tell you the important HDFS commands and their working which are used most frequently when working with Hadoop File System.
HDFS Command to check the health of the Hadoop file system.
Command: hdfs fsck /
HDFS Command to display the list of Files and Directories in HDFS.
Command: hdfs dfs –ls /
HDFS Command to create the directory in HDFS.
Usage: hdfs dfs –mkdir /directory_name
Command: hdfs dfs –mkdir /new_edureka
Note: Here we are trying to create a directory named “new_edureka” in HDFS.
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HDFS Command to create a file in HDFS with file size 0 bytes.
Usage: hdfs dfs –touchz /directory/filename
Command: hdfs dfs –touchz /new_edureka/sample
Note: Here we are trying to create a file named “sample” in the directory “new_edureka” of hdfs with file size 0 bytes.
HDFS Command to check the file size.
Usage: hdfs dfs –du –s /directory/filename
Command: hdfs dfs –du –s /new_edureka/sample
HDFS Command that reads a file on HDFS and prints the content of that file to the standard output.
Usage: hdfs dfs –cat /path/to/file_in_hdfs
Command: hdfs dfs –cat /new_edureka/test
HDFS Command that takes a source file and outputs the file in text format.
Usage: hdfs dfs –text /directory/filename
Command: hdfs dfs –text /new_edureka/test
HDFS Command to copy the file from a Local file system to HDFS.
Usage: hdfs dfs -copyFromLocal <localsrc> <hdfs destination>
Command: hdfs dfs –copyFromLocal /home/edureka/test /new_edureka
Note: Here the test is the file present in the local directory /home/edureka and after the command gets executed the test file will be copied in /new_edureka directory of HDFS.
HDFS Command to copy the file from HDFS to Local File System.
Usage: hdfs dfs -copyToLocal <hdfs source> <localdst>
Command: hdfs dfs –copyToLocal /new_edureka/test /home/edureka
Note: Here test is a file present in the new_edureka directory of HDFS and after the command gets executed the test file will be copied to local directory /home/edureka
HDFS Command to copy single source or multiple sources from local file system to the destination file system.
Usage: hdfs dfs -put <localsrc> <destination>
Command: hdfs dfs –put /home/edureka/test /user
Note: The command copyFromLocal is similar to put command, except that the source is restricted to a local file reference.
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HDFS Command to copy files from hdfs to the local file system.
Usage: hdfs dfs -get <src> <localdst>
Command: hdfs dfs –get /user/test /home/edureka
Note: The command copyToLocal is similar to get command, except that the destination is restricted to a local file reference.
HDFS Command to count the number of directories, files, and bytes under the paths that match the specified file pattern.
Usage: hdfs dfs -count <path>
Command: hdfs dfs –count /user
HDFS Command to remove the file from HDFS.
Usage: hdfs dfs –rm <path>
Command: hdfs dfs –rm /new_edureka/test
HDFS Command to remove the entire directory and all of its content from HDFS.
Usage: hdfs dfs -rm -r <path>
Command: hdfs dfs -rm -r /new_edureka
HDFS Command to copy files from source to destination. This command allows multiple sources as well, in which case the destination must be a directory.
Usage: hdfs dfs -cp <src> <dest>
Command: hdfs dfs -cp /user/hadoop/file1 /user/hadoop/file2
Command: hdfs dfs -cp /user/hadoop/file1 /user/hadoop/file2 /user/hadoop/dir
HDFS Command to move files from source to destination. This command allows multiple sources as well, in which case the destination needs to be a directory.
Usage: hdfs dfs -mv <src> <dest>
Command: hdfs dfs -mv /user/hadoop/file1 /user/hadoop/file2
HDFS Command that makes the trash empty.
Command: hdfs dfs -expunge
HDFS Command to remove the directory.
Usage: hdfs dfs -rmdir <path>
Command: hdfs dfs –rmdir /user/hadoop
HDFS Command that returns the help for an individual command.
Usage: hdfs dfs -usage <command>
Command: hdfs dfs -usage mkdir
Note: By using usage command you can get information about any command.
HDFS Command that displays help for given command or all commands if none is specified.
Command: hdfs dfs -help
This is the end of the HDFS Commands blog, I hope it was informative and you were able to execute all the commands. For more HDFS Commands, you may refer Apache Hadoop documentation here.
Now that you have executed the above HDFS commands, check out the Hadoop training by Edureka, a trusted online learning company with a network of more than 250,000 satisfied learners spread across the globe. The Edureka’s Big Data Masters Course helps learners become expert in HDFS, Yarn, MapReduce, Pig, Hive, HBase, Oozie, Flume and Sqoop using real-time use cases on Retail, Social Media, Aviation, Tourism, Finance domain.
Got a question for us? Please mention it in the comments section and we will get back to you.
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Hi Team,
Can you please share the more real time experience commands with examples which is used by Admins and developer.
Under the cat command header, the explanation is given for copyFromLocal command. Please correct the same
Hey Shweta, thanks for checking out our blog.
You are right. We have corrected it. Cheers! :)
This blog was very useful. I was getting confused with local path and hdfs path. This blog gave me confidence over hdfs commands. Thank you
Hey Kuldeep, thanks for checking out our blog. We’re glad you found it useful.
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