Shulou(Shulou.com)06/03 Report--

Hadoop common operation commands list directory list [root@centos67 ~] # hdfs dfs-ls / recursively list directory list [root@centos67 ~] # hdfs dfs-lsr / create directory [root@centos67 ~] # hdfs dfs-mkdir / input/test delete directory [root@centos67 ~] # hdfs dfs-rmr / input/test creation file [root@centos67 ~] # hdfs dfs-touchz / input/test/test.txt file rename [root@centos67 ~] # hdfs Dfs-mv / input/test/test.txt / input/test/test.exe upload file [root@centos67 ~] # hdfs dfs-put. / test.log / input/test/ download file [root@centos67 ~] # hdfs dfs-get / input/test/test.log. / View file contents [root@centos67 ~] # hdfs dfs-cat / input/test/test.log delete file [root@centos67 ~] # hdfs dfs-rm / input/test/test.log copy File [root@centos67 ~] # hdfs dfs-cp / input/test/test.log / test.log Statistics directory all file sizes [root@centos67 ~] # hdfs dfs-du / input Statistics entire directory size [root@centos67 ~] # hdfs dfs-dus / input saves all file contents under the specified directory as one file And download to the local [root@centos67 ~] # hdfs dfs-getmerge / input/test. / test.txt to view the last 1KB content of the file [root@centos67 ~] # hdfs dfs / input/test/test.log modify the file belongs to the master group, you can add-R recursive [root@centos67 ~] # hdfs dfs-chown xiaomo:xiaomo / input/test/test.log to modify file permissions. You can add-R recursive [root@centos67 ~] # hdfs dfs-chmod 700 / input/test/test.log to calculate the current file / directory information directory number, file number, file size, file name / directory name [root@centos67 ~] # hdfs dfs-count / input/test/test.log to empty the Recycle Bin. When the file is deleted It will first be moved to the temporary directory .Trash /, and when the delay time has elapsed, the file will be permanently deleted. [root@centos67 ~] # hdfs dfs-expunge [root@centos67 ~] # hdfs dfs-test / input checks / input as follows:-e exists, if it exists, returns 0, otherwise returns whether 1-z is empty, if the length is 0, returns 0, otherwise returns whether 1-d is a directory, if it is a directory Return 0, otherwise return 1 to display the contents of the file. The compressed file will be decompressed [root@centos67 ~] # hdfs dfs-text / input/test/test.log to view the help of a command [root@centos67 ~] # hdfs dfs-help ls [root@centos67 ~] # hdfs dfs-help touchz to kill the running hadoop job [root@centos67 ~] # hdfs job- kill [job-id]

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