A.hdfs dfs-ls/user/hduser/file1.txt B.hdfs dfs-mkdir/user/hduser/file1.txt C.hdfs dfs-cat/user/hduser/file1.txt D.hdfs dfs-put/user/hduser/file1.txt
A.UPDATE B.CREATE C.UPDATED D.ALTER
A.文件 B.目錄 C.兩者都是 D.兩者都不是