HDFS (hadoop distrubuted file system) commands

1)Start-all.sh  -to start all

2) ->Hadoop

3) Hadoop namenode –format

To start hdfs

1)           Start-dfs-sh to start hadoop i.e name node,data node ,secondary node

2)           Start-mapred.sh to start job tracker and task tracker

Admin commands

Dfsadmin

Mradmin

Fsck

Balancer

Distep

Fs

Pipes

Job

Queue

Jar

Developer commands

1)           Hadoop fs

2)           Hadoop fs –ls /

3)           Hadoop –lsr

4)           Hadoop fs –mkdir /newfolder

5)           Hadoop fs –ls foldername

6)           Hadoop fs – put /etc/hostname /etc/hosts/kalian

7)           Jps

8)           Hadoop fs –cp /folder/host1 /folder/host2

9)           put – local to hdfs

10)   cp,mv – hdfs to hdfs

11)   get – hdfs to local

12)   rm

13)   hadoop fs –chown -  r    (read permissions to other user)

14)   hadoop fs –cat

15)   hadoop fs –text

16)   hadoop fs –du

17)   hadoop fs –dus

18)   hadoop –help