what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?

Question

Are they same? In my view "hadoop fs" command shows the hdfs files and the "hdfs dfs" command shows the local files, why is that? Select the correct answer from above options

Answer 1

The “fs” term refers to a generic file system, which by the definition can point to ANY file system ( including HDFS), but dfs is very specific. On the other hand, “DFS” refers precisely to Hadoop Distributed File System access. So when we use FS it can perform operation related to local or hadoop distributed file system and dfs can perform operation related to hadoop distributed file system only. So, hadoop fs It is used when we are dealing with different file systems such as Local FS, HDFS etc. hdfs dfs It is used when we are dealing for operations related to HDFS. Another command, which looks similiar to these two is 3. hadoop dfs This command should not be used, as it is deprecated. Even if you use it, it will send the command to hdfs dfs.