https://hadoop.apache.org/docs/r2.7.1/hadoop-project-dist/hadoop-common/FileSystemShell.html#Overview
hdfs fs -ls
- hadoop fs -put localfile /user/hadoop/hadoopfile
- hadoop fs -put localfile1 localfile2 /user/hadoop/hadoopdir
- hadoop fs -put localfile hdfs://nn.example.com/hadoop/hadoopfile
- hadoop fs -put - hdfs://nn.example.com/hadoop/hadoopfile Reads the input from stdin.