Hadoop creates user and HDFS permissions, HDFS operations, and other common shell commands

Sudo addgroup hadoop # Add a hadoop Group
Sudo usermod-a-g hadoop Larry # Add the current user to the hadoop Group
Sudo gedit ETC/sudoers # Add the hadoop group to sudoer
Hadoop all = (all) All after root all = (all) All

Modify hadoop Directory Permissions
Sudo chown-r Larry: hadoop/home/Larry/hadoop <owner: group File>

Sudo chmod-r 755/home/Larry/hadoop

Modify HDFS Permissions
Sudo bin/hadoop DFS-chmod-r 755/
Sudo bin/hadoop DFS-ls/

Modify the HDFS file owner

Sudo bin/hadoop FS-chown-r Larry/

Sudo bin/hadoop dfsadmin-safemode leave # Remove hadoop Security Mode

Hadoop FS-copyfromlocal <localsrc> URI # copy a local file to HDFS

Hadoop FS-cat file: // file3/user/hadoop/file4 # output the content of the specified file in the path to stdout

Hadoop
FS-chgrp [-R] group URI # change the group to which the object belongs

Hadoop
FS-chmod [-R] 755 URI # Change User Access Permissions

Hadoop
FS-chown [-R] [owner] [: [group] URI [URI] # modify the object owner

Hadoop
FS-copytolocal URI localdst # copy the HDFS file to the local device

Hadoop
FS-cp uri [URI…] <DEST> # copy HDFS files to other directories

Hadoop
FS-du URI [URI…] # Display the size of all files in the directory

Hadoop
FS-getmerge <SRC> <localdst> [addnl] # Merge files to the local directory