常用的HDFS操作

cd /home/hadoop

touch wzh.txt

ls /home/hadoop

cat wzh.txt

./sbin/start-dfs.sh
./bin/hdfs dfs -mkdir -p /user/hadoop
./bin/hdfs dfs -mkdir input
 ./bin/hdfs dfs -put ./wzh.txt input

./bin/hdfs dfs -ls input

./bin/hdfs dfs -ls /input
./bin/hdfs dfs -cat input/wzh.txt

cd hadoop
 rm -r wzh.txt
ls -al

./bin/hdfs dfs -get /input/wzh.txt ~/hadoop

./bin/hdfs dfs -rm input/wzh.txt
./bin/hdfs dfs -ls input

hadoop fs -put /home/hadoop/wzh.txt /usr/local/hadoop
hadoop fs -test -e /usr/local/hadoop/wzh.txt



if $(hadoop fs -test -e /home/hadoop/wzh.txt); <br>then $(hadoop fs -copyToLocal /usr/local/hadoop/wzh.txt /home/hadoop/wzh.txt);<br>else $(hadoop fs -copyToLocal /usr/local/hadoop/wzh.txt /home/hadoop/wzh2.txt); fi

hadoop dfs -cat /usr/local/hadoop/wzh.txt

hadoop dfs -ls -h /usr/local/hadoop/wzh.txt

hadoop dfs -ls -R -h /usr/local/hadoop



if $(hadoop dfs -test -d /usr/local/hadoop/test); then $(hadoop dfs -touch /usr/local/hadoop/test/wzh1.txt); else $(hadoop dfs -mkdir -p /usr/local/hadoop/test && hadoop dfs -touch /usr/local/hadoop/test/wzh1.txt); fi

hadoop dfs -rm -r /usr/local/hadoop/test

hadoop dfs -rm /usr/local/hadoop/wzh.txt

hadoop dfs -rmr /usr/local/hadoop

hadoop fs -mv /usr/local/hadoop/wzh.txt /usr/local/hadoop/hadoop_tmp/wzh.txt