Shell commands provided by Hadoop accomplish the same task

1. Create a file txt in the "/home/hadoop/" directory of the local Linux file system, and enter some words at will.

   mkdir hadoop
   cd hadoop
   touch test.txt
   gedit test.txt

2. View file location locally (ls)

   ls -al

3. Display file contents locally

   cat test.txt

4. Use the command to upload "txt" in the local file system to the input directory of the current user directory in HDFS.

   cd /usr/local/hadoop
   ./sbin/start-dfs.sh
   ./bin/hdfs dfs -mkdir input
   ./bin/hdfs dfs -put ~/hadoop/test.txt input

5. View files in hdfs (-ls)

   ./bin/hdfs dfs -ls

6. Display the content of the file in hdfs

   ./bin/hdfs dfs -cat input/test.txt

7. delete the local txt file and view the directory

   rm -r ~/hadoop/test.txt

8. Download the txt to the original local location from hdfs.

   cd /usr/local/hadoop
   ./sbin/start-dfs.sh
   ./bin/hdfs dfs -get input/test.txt ~/hadoop

9. delete txt from hdfs and view directory

   ./bin/hdfs dfs -rm -r input/test.txt
   ./bin/hdfs dfs -ls -R