Cheat sheet for Hadoop , up, up !!!!

[root@hulk sbin]# hadoop version
Hadoop 2.4.1
Subversion http://svn.apache.org/repos/asf/hadoop/common -r 1604318
Compiled by jenkins on 2014-06-21T05:43Z
Compiled with protoc 2.5.0
From source with checksum bb7ac0a3c73dc131f4844b873c74b630
This command was run using /usr/local/hadoop-2.4.1/share/hadoop/common/hadoop-common-2.4.1.jar

Check hadoop is running
[root@hulk sbin]# hadoop dfsadmin -report
List the content of home directory
$ hdfs dfs -ls /user/claudio
Upload file from local file to HDFS
$ hdfs dfs -put songs.txt /user/claudio
Cat the content of the file from HDFS
$ hdfs dfs -cat /user/claudio/songs.txt
Change permissions to file
$ hdfs dfs -chmod 700 /user/claudio/songs.txt
Set the replication factor of the file to 4
$ hdfs dfs -setrep -w 4 /user/claudio/songs.txt
Check the file size
$ hdfs dfs -du -h /user/adam/songs.txt
Create subdirectory in your home directory
$ hdfs dfs -mkdir songs
Move files across
$ hdfs dfs -mv songs.txt songs/
Remove directory from HDFS
$ hdfs dfs -rm -r songs