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Some basic operations in Hadoop

Source: Internet
Author: User
Keywords nbsp; dfs some for example noodles
Tags abstract aliyun basic difference distributed environment example file
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& http: //www.aliyun.com/zixun/aggregation/37954.html "> nbsp; The first rough talk about the difference between" hadoop fs "and" hadoop dfs ": fs is the more abstract level, in a distributed environment , Fs is dfs, but in the local environment, fs is a local file system, this time dfs is not available.

1, list the HDFS file:

1hadoop fs -ls

a) The contents of the "/ user / username /" directory of HDFS are listed without anything following -ls

b) If you want to list the contents of a folder, -ls followed by the path to the folder, for example, lists the contents of input:

1hadoop fs -ls input

2, create a folder in HDFS:

1hadoop fs -mkdir The name of the folder

E.g:

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