%%%% In the whole document, change <login> to your login name.

hadoop

hadoop fs

hadoop jar

hadoop fs -ls /
hadoop fs -ls /user/
hadoop fs -ls /user/<login>

%%%% Example in Java

cd ~
mkdir -p mapreduce/WordCount
cd mapreduce/WordCount

cp /home/NDBI040/mapreduce/WordCount.java .

mkdir classes
javac -classpath /home/NDBI040/mapreduce/hadoop-common-3.1.1.jar:/home/NDBI040/mapreduce/hadoop-mapreduce-client-core-3.1.1.jar -d classes/ WordCount.java
jar -cvf WordCount.jar -C classes/ .

hadoop fs -mkdir /user/<login>/WordCount
hadoop fs -mkdir /user/<login>/WordCount/input1
hadoop fs -copyFromLocal /home/NDBI040/mapreduce/input1/movies.txt /user/<login>/WordCount/input1

hadoop jar WordCount.jar WordCount /user/<login>/WordCount/input1 /user/<login>/WordCount/output1

hadoop fs -copyToLocal /user/<login>/WordCount/output1/part-r-00000 result.txt
cat result.txt

hadoop fs -rm -r /user/<login>/WordCount/output1/

%%%% Example in Python

cd ~
mkdir -p mapreduce2
cd mapreduce2

cp /home/NDBI040/mapreduce2/mapper.py .
cp /home/NDBI040/mapreduce2/reducer.py .

hadoop fs -rm -r /user/<login>/WordCount/output1/

hadoop jar /usr/local/hadoop/share/hadoop/tools/lib/hadoop-streaming-3.3.6.jar \
-files mapper.py,reducer.py    -mapper mapper.py  -reducer reducer.py \
-input /user/<login>/WordCount/input1 -output /user/<login>/WordCount/output1

hadoop fs -ls /user/<login>/WordCount/output1
rm result
hadoop fs -copyToLocal /user/<login>/WordCount/output1/part-00000 result
cat result