HDFS Commands Part - I
Prequirement Before start Hadoop shell have to install Hadoop . File System Shell Most of the commands in FS shell is like corresponding Linux commands. The FileSystem (FS) shell is invoked by bin/hadoop fs <args> . All the FS shell commands take path URIs as arguments. For HDFS the scheme is hdfs , and for the local filesystem the scheme is file . The scheme and authority are optional. If not specified, the default scheme specified in the configuration is used. An HDFS file or directory such as /parent/child can be specified as hdfs://<namenodehost>/dir_1/dir_2 or simply as /dir_1/dir_2 ( given that your configuration is set to point to hdfs://<namenodehost> ). Error information is sent to stderr and the output is sent to stdout . Basic Commands 1. version This HDFS command prints the Hadoop version. Example: hdfs dfs version 2. cat This HDFS command used to displays the contents of the filename on stdout/conso