Big data learning monk 2022-02-13 07:18:37 阅读数:65
HDFS Command line official document operation http://hadoop.apache.org/docs/r1.0.4/cn/hdfs_shell.html
hdfs The most basic command line uses
HDFS The command line is the most commonly used basic operation
(1) view help
hdfs dfs -help
(2) View current catalog information
hdfs dfs -ls /
(3) Upload files
hdfs dfs -put / The local path /hdfs route
(4) Cut file
hdfs dfs -moveFromLocal a.txt /aa.txt
(5) Download files to local
hdfs dfs -get /hdfs route / The local path
(6) Merge downloads
hdfs dfs -getmerge /hdfs Path folder / Combined documents
(7) Create folder
hdfs dfs -mkdir /hello
(8) Create multi-level folders
hdfs dfs -mkdir -p /qwe/qqq/www
(9) Move hdfs file
hdfs dfs -mv /hdfs route /hdfs route
(10) Copy hdfs file
hdfs dfs -cp /hdfs route /hdfs route
(11) Delete hdfs file
hdfs dfs -rm /aa.txt
(12) Recursive deletion hdfs Multi level folder
hdfs dfs -rm -r /qwe
Can also be
hdfs dfs -rm -R /qwe
(13) see hdfs Documents in
hdfs dfs -cat / file hdfs dfs -tail -f / file
(14) See how many files are in the folder
hdfs dfs -count / Folder
(15) see hdfs The total space of
hdfs dfs -df /
Display units
hdfs dfs -df -h /
(16) Number of modified copies
hdfs dfs -setrep 1 /a.txt
(17) Give the root directory the highest permission
hdfs dfs -chmod 777 /
(18) Recursively give the highest permission to all files in the root directory
hdfs dfs -chmod -R 777 /
(19) see test The content of the document
hdfs dfs -text /test.txt
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