Big Data Simplified

Introducing Hadoop | 61

3.5 HDFS TECHNICAL COMMANDS

Let us now look at a few frequently used HDFS commands.

Use Case Hadoop Commands

The purpose of this command is to look at the entire HDFS

le system. You have to mention ‘hadoop fs’ always as

a prex for HDFS commands, and thereafter put a dash sign

(‘-‘), followed by the desired command, for example, ‘ls’ for

le listing.

hadoop fs -ls /

The purpose of this command is to create a directory named

‘bigdata’ inside the HDFS le system. Now assume that a

le named ‘employee.txt’ inside Linux local le system,

for example, under /usr/local. If you want to replicate

this le in HDFS, then use this ...