HDFS DFS Chmod
In Hadoop HDFS (Hadoop Distributed File System), the hdfs dfs -chmod
command is used to change the permissions of files and directories in HDFS. It allows you to modify the access control settings (permissions) for HDFS files and directories, similar to the chmod
command in a Unix-like file system.
The basic syntax for the hdfs dfs -chmod
command is as follows:
hdfs dfs -chmod <permissions> <path>
<permissions>
: This is the new set of permissions that you want to apply to the specified file or directory in HDFS. Permissions are represented as a three-character string, where each character represents the permission for the owner, group, and others, respectively. Each permission character can be one of the following:r
(read): Allows reading the file or directory.w
(write): Allows modifying (writing) the file or directory.x
(execute): Allows executing the file (for directories, it allows traversal).
<path>
: This is the HDFS path to the file or directory for which you want to change the permissions.
Here are some examples of how to use the hdfs dfs -chmod
command:
To grant read and write permissions to the owner of a file named “example.txt” in HDFS:
bashhdfs dfs -chmod u+rw example.txt
To remove execute permission for others (everyone else) from a directory named “my_directory” in HDFS:
bashhdfs dfs -chmod o-x my_directory
To grant read and execute permissions to both the owner and the group for a file named “data.csv” in HDFS:
bashhdfs dfs -chmod ug+rx data.csv
To set specific permissions using octal notation (e.g., 755 for owner: read, write, execute; group: read, execute; others: read, execute) on a file “script.sh”:
bashhdfs dfs -chmod 755 script.sh
.
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